我有以下查询,该查询返回数据库中所有在两个给定日期之间进行交易的商人。
SELECT distinct me.id, me.merchant_num, me.merchant_nm, count(1) as num_transactions
,CASE WHEN me.status = 'A' THEN 'Yes' ELSE 'No' END as production_mode
FROM merchant_t me
LEFT OUTER JOIN transaction_t tt
ON tt.merchant_id = me.id
AND tt.transaction_dt BETWEEN '2020-04-01' and '2020-04-30'
WHERE me.status = 'T'
GROUP BY me.id, me.merchant_num, me.merchant_nm, me.status
但是,我需要在查询中包含其他信息。我在下面编写了增强型查询,但它导致商家重复。我知道查询可以写得更好,但这是我的SQL知识的局限。
我需要保持与上述查询相同的结果数。
SELECT distinct me.id, me.merchant_num, me.merchant_nm, count(1) as num_transactions
,CASE WHEN me.status = 'A' THEN 'Yes' ELSE 'No' END as production_mode
-- additional information needed as below, with comments
-- the date of the last transaction that uses IBank (IBA)
,(select max(transaction_dt)
from transaction_t where merchant_id = me.id
and tt.bank_txt = 'IBA') as last_ibank_transaction
-- the value of the "trans_live" column for the merchant's most recent transaction
,(select top 1 trans_live
from transaction_t
where merchant_id = me.id order by transaction_dt desc) is_live
FROM merchant_t me
LEFT OUTER JOIN transaction_t tt
ON tt.merchant_id = me.id
AND tt.transaction_dt BETWEEN '2020-04-01' and '2020-04-30'
WHERE me.status = 'T'
GROUP BY me.id, me.merchant_num, me.merchant_nm, me.status, tt.bank_txt
这将返回重复的商人。在下面的屏幕截图中,我筛选了一个商人以显示重复项。第一个结果集来自原始查询。第二个来自更新的查询。“ DISTINCT”完成了工作,但我只想查看一个商家记录。
涉及两个表:
merchant_t
----------
id merchant_num merchant_nm status
transaction_t
--------------
id merchant_id transaction_dt trans_live bank_txt
我试图避免在子查询中包含日期
更新的查询返回许多重复项,如下所示。
USE [XYZ]
GO
/****** Object: Table [dbo].[merchant_t] Script Date: 6/10/2020 5:23:51 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[merchant_t](
[id] [int] IDENTITY(1,1) NOT NULL,
[merchant_num] [nvarchar](50) NULL,
[merchant_nm] [nvarchar](100) NULL,
[status] [nchar](1) NULL
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[transaction_t] Script Date: 6/10/2020 5:23:51 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[transaction_t](
[id] [int] IDENTITY(1,1) NOT NULL,
[merchant_id] [int] NULL,
[transaction_dt] [datetime] NULL,
[trans_live] [bit] NULL,
[bank_txt] [nvarchar](30) NULL
) ON [PRIMARY]
GO
SET IDENTITY_INSERT [dbo].[merchant_t] ON
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (335, N'PriceBusterDVD_NZ_AN', N'Pricebuster NZ ANZ', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (341, N'T6400050', N'Merco Test Merchant', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (342, N'6400262', N'Musac School Test 1', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (366, N'T6400093', N'Paystation Limited Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (367, N'T6400435', N'PB Technologies Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (374, N'PriceBusterDVD_NZ_BN', N'Pricebuster NZ BNZ', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (389, N'TAirNewZealandNZ_All', N'Test Air NZ - All', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (390, N'T6400061', N'The Warehouse Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (392, N'T6400246', N'University of Waikato Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (538, N'T6400449', N'NZTA Payments Dev System Testing', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (544, N'T6400447', N'NZTA Tolling Dev System Testing', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (631, N'SS64000475', N'Smeedi Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (729, N'T6400048', N'Marram Community Trust Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (776, N'SS64000665', N'POLi Test Bench', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (936, N'T6400002', N'WorldRemit Test NZ', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1033, N'SS64005103', N'Ahura Consulting Limited', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1173, N'SS64005386', N'Warehouse Stationery Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1236, N'SS64005423', N'KlickEx Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1435, N'T6400477', N'NZMCA', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1580, N'T6400478', N'2 Degrees Mobile - Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1626, N'SS64006121', N'Property Council New Zealand', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1714, N'SS64006558', N'ServiceFinder.co.nz', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1972, N'T6400480', N'2 Degrees Mobile Accept Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (1988, N'T6400484', N'HelloClub Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (2011, N'T6400482', N'Horowhenua District Council Test', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (2260, N'SS64008067', N'Success Global', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (2274, N'64007479', N'Samsung Electronics New Zealand', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (2397, N'SS64008228', N'MyBitcoinSaver.com', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (2418, N'6400478', N'Spark Staging', N'T')
GO
INSERT [dbo].[merchant_t] ([id], [merchant_num], [merchant_nm], [status]) VALUES (2441, N'SS64008239', N'Kiwi Petz', N'T')
GO
SET IDENTITY_INSERT [dbo].[merchant_t] OFF
GO
SET IDENTITY_INSERT [dbo].[transaction_t] ON
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215957, 389, CAST(N'2020-04-01T06:55:37.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215958, 389, CAST(N'2020-04-01T06:56:13.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215959, 389, CAST(N'2020-04-01T07:06:47.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215960, 389, CAST(N'2020-04-01T07:09:09.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215961, 389, CAST(N'2020-04-01T08:19:28.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215962, 389, CAST(N'2020-04-01T08:19:45.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215963, 389, CAST(N'2020-04-01T08:19:57.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215964, 389, CAST(N'2020-04-01T08:20:16.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215965, 389, CAST(N'2020-04-01T09:33:40.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215966, 389, CAST(N'2020-04-01T09:33:46.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215967, 389, CAST(N'2020-04-01T11:05:35.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215968, 389, CAST(N'2020-04-01T11:06:13.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215969, 389, CAST(N'2020-04-01T11:12:51.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215970, 389, CAST(N'2020-04-01T11:17:38.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215971, 389, CAST(N'2020-04-01T12:45:13.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215972, 389, CAST(N'2020-04-01T12:45:49.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215973, 389, CAST(N'2020-04-01T12:50:17.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18201776, 1580, CAST(N'2020-04-01T14:16:38.000' AS DateTime), 0, N'ANZ')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215974, 389, CAST(N'2020-04-01T12:59:06.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215975, 389, CAST(N'2020-04-01T14:18:13.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215976, 389, CAST(N'2020-04-01T14:18:21.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215977, 389, CAST(N'2020-04-01T14:26:15.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215978, 389, CAST(N'2020-04-01T14:33:02.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215979, 389, CAST(N'2020-04-01T15:12:43.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215980, 389, CAST(N'2020-04-01T15:12:46.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215981, 389, CAST(N'2020-04-01T15:41:14.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18215982, 389, CAST(N'2020-04-01T15:43:53.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18223719, 2441, CAST(N'2020-04-02T10:20:03.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231457, 389, CAST(N'2020-04-02T07:11:32.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231458, 389, CAST(N'2020-04-02T07:13:06.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231459, 389, CAST(N'2020-04-02T08:49:33.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231460, 389, CAST(N'2020-04-02T09:03:17.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231461, 389, CAST(N'2020-04-02T09:08:39.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231462, 389, CAST(N'2020-04-02T11:17:25.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231463, 389, CAST(N'2020-04-02T11:20:53.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231464, 389, CAST(N'2020-04-02T11:22:38.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231465, 389, CAST(N'2020-04-02T12:03:20.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231466, 389, CAST(N'2020-04-02T12:03:58.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231467, 389, CAST(N'2020-04-02T12:20:27.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18231468, 389, CAST(N'2020-04-02T12:37:47.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18233881, 341, CAST(N'2020-04-02T13:54:30.000' AS DateTime), 0, N'ANZ')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18237848, 2011, CAST(N'2020-04-03T13:31:36.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245130, 389, CAST(N'2020-04-03T06:24:34.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245131, 389, CAST(N'2020-04-03T06:26:47.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245132, 389, CAST(N'2020-04-03T10:55:09.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245133, 389, CAST(N'2020-04-03T11:00:42.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245134, 389, CAST(N'2020-04-03T11:00:57.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245135, 389, CAST(N'2020-04-03T14:01:58.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245136, 389, CAST(N'2020-04-03T14:08:48.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245137, 389, CAST(N'2020-04-03T14:41:57.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18245138, 389, CAST(N'2020-04-03T14:44:40.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18250367, 2441, CAST(N'2020-04-04T09:53:19.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18274546, 2274, CAST(N'2020-04-06T02:50:01.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18274563, 1714, CAST(N'2020-04-06T06:36:45.000' AS DateTime), 1, N'ANZ')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277532, 389, CAST(N'2020-04-06T06:37:57.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277533, 389, CAST(N'2020-04-06T06:46:45.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277534, 389, CAST(N'2020-04-06T07:36:29.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277535, 389, CAST(N'2020-04-06T07:43:00.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277536, 389, CAST(N'2020-04-06T08:11:22.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277537, 389, CAST(N'2020-04-06T08:12:13.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18279767, 341, CAST(N'2020-04-06T09:40:12.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18268407, 1033, CAST(N'2020-04-06T20:15:56.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270264, 544, CAST(N'2020-04-06T12:36:12.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270265, 544, CAST(N'2020-04-06T12:37:11.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270266, 544, CAST(N'2020-04-06T12:38:08.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270267, 544, CAST(N'2020-04-06T12:40:05.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270268, 544, CAST(N'2020-04-06T12:42:50.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270269, 544, CAST(N'2020-04-06T12:43:36.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270270, 544, CAST(N'2020-04-06T12:45:09.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18270271, 544, CAST(N'2020-04-06T12:45:26.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18273055, 538, CAST(N'2020-04-06T12:34:02.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277538, 389, CAST(N'2020-04-06T11:30:42.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277539, 389, CAST(N'2020-04-06T11:31:06.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277540, 389, CAST(N'2020-04-06T11:44:56.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277541, 389, CAST(N'2020-04-06T11:49:43.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277542, 389, CAST(N'2020-04-06T13:07:37.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277543, 389, CAST(N'2020-04-06T13:08:50.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277544, 389, CAST(N'2020-04-06T14:10:14.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277545, 389, CAST(N'2020-04-06T14:10:37.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277546, 389, CAST(N'2020-04-06T14:10:54.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277547, 389, CAST(N'2020-04-06T14:14:26.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277548, 389, CAST(N'2020-04-06T15:25:39.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277549, 389, CAST(N'2020-04-06T15:26:02.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277550, 389, CAST(N'2020-04-06T18:31:10.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277551, 389, CAST(N'2020-04-06T18:33:05.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277552, 389, CAST(N'2020-04-06T18:44:58.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277553, 389, CAST(N'2020-04-06T19:46:52.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277554, 389, CAST(N'2020-04-06T20:31:33.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277555, 389, CAST(N'2020-04-06T20:43:56.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277556, 389, CAST(N'2020-04-06T20:51:42.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18277557, 389, CAST(N'2020-04-06T21:03:01.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18293723, 389, CAST(N'2020-04-07T06:20:15.000' AS DateTime), 0, N'IBA')
GO
INSERT [dbo].[transaction_t] ([id], [merchant_id], [transaction_dt], [trans_live], [bank_txt]) VALUES (18293724, 389, CAST(N'2020-04-07T06:45:17.000' AS DateTime), 0, N'IBA')
GO
/****** Object: Index [PK_merchant_t] Script Date: 6/13/2020 8:40:44 PM ******/
ALTER TABLE [dbo].[merchant_t] ADD CONSTRAINT [PK_merchant_t] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object: Index [IX_status] Script Date: 6/13/2020 8:44:08 PM ******/
CREATE NONCLUSTERED INDEX [IX_status] ON [dbo].[merchant_t]
(
[status] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object: Index [IX_merchant_id] Script Date: 6/13/2020 8:48:08 PM ******/
CREATE NONCLUSTERED INDEX [IX_merchant_id] ON [dbo].[transaction_t]
(
[merchant_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object: Index [IX_transaction_dt] Script Date: 6/13/2020 8:45:59 PM ******/
CREATE NONCLUSTERED INDEX [IX_transaction_dt] ON [dbo].[transaction_t]
(
[transaction_dt] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object: Index [IX_trans_live] Script Date: 6/13/2020 8:46:57 PM ******/
CREATE NONCLUSTERED INDEX [IX_trans_live] ON [dbo].[transaction_t]
(
[trans_live] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object: Index [IX_merchant_id] Script Date: 6/13/2020 8:47:17 PM ******/
CREATE NONCLUSTERED INDEX [IX_merchant_id] ON [dbo].[transaction_t]
(
[merchant_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object: Index [IX_bank_txt] Script Date: 6/13/2020 8:47:37 PM ******/
CREATE NONCLUSTERED INDEX [IX_bank_txt] ON [dbo].[transaction_t]
(
[bank_txt] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
在第一个查询中,您具有以下子句:
GROUP BY me.id, me.merchant_num, me.merchant_nm, me.status
在第二个查询中,您具有以下子句:
GROUP BY me.id, me.merchant_num, me.merchant_nm, me.status, tt.bank_txt
您在第二个查询中得到的行数有所不同,因为您的行数GROUP BY
不同。您需要保持相同。
这是一种方法。我使用CTE使查询可读。
As you can see in the comments in the query, it returns the value of the trans_live
column for the merchant's most recent transaction. Most recent transaction of the merchant across all dates, regardless of the filter in the CTE. Same with the date of the last transaction that uses IBank (IBA). It returns the last transaction of the merchant across all dates, regardless of the filter in the CTE.
It is not clear from the question if this is what you want, though. Please clarify.
WITH
CTE_Merchants
AS
(
SELECT -- distinct
-- you don't need distinct here, because GROUP BY does it
-- try to comment out distinct, you should get exactly the same result
me.id, me.merchant_num, me.merchant_nm
,count(tt.id) as num_transactions
-- return 0 count for merchants that don't have any transactions
-- within the given range of dates
,CASE WHEN me.status = 'A' THEN 'Yes' ELSE 'No' END as production_mode
FROM
merchant_t me
LEFT OUTER JOIN transaction_t tt
ON tt.merchant_id = me.id
AND tt.transaction_dt BETWEEN '2020-04-01' and '2020-04-30'
WHERE me.status = 'T'
GROUP BY me.id, me.merchant_num, me.merchant_nm, me.status
)
SELECT
CTE_Merchants.id
,CTE_Merchants.merchant_num
,CTE_Merchants.merchant_nm
,CTE_Merchants.num_transactions
,CTE_Merchants.production_mode
,A1.is_live
,A2.last_IBA_transaction_dt
FROM
CTE_Merchants
OUTER APPLY
(
-- use OUTER APPLY (not CROSS APPLY) in case there are merchants with no transactions
-- The value of the "trans_live" column for the merchant's most recent transaction.
-- Most recent across all dates, regardless of the filter in the CTE
select top 1
transaction_t.trans_live AS is_live
from transaction_t
where
transaction_t.merchant_id = CTE_Merchants.id
order by transaction_dt desc
) AS A1
OUTER APPLY
(
-- use OUTER APPLY (not CROSS APPLY) in case there are merchants with no transactions
-- The date of the last transaction that uses IBank (IBA).
-- The last transaction across all dates, regardless of the filter in the CTE
select top 1
transaction_t.transaction_dt AS last_IBA_transaction_dt
from transaction_t
where
transaction_t.merchant_id = CTE_Merchants.id
and transaction_t.bank_txt = 'IBA'
order by transaction_dt desc
) AS A2
;
For this query to work efficiently, I would recommend to create certain indexes. You already have an index IX_status
on the merchant_t
table. This is good.
Those indexes that you have on the transaction_t
table are not the best for this kind of query. You existing indexes IX_transaction_dt
, IX_trans_live
, IX_bank_txt
are not useful for this query. Even IX_merchant_id
by itself is not really useful, especially if you replace it with a composite index on (merchant_id, transaction_dt)
, as I've shown below.
I hope you do have a clustered primary key on id
in transaction_t
table. Similar to the primary key in the merchant_t
table. If not, I'd create it.
Then, for efficient join between merchant_t
and transaction_t
tables and for efficient retrieval of the latest trans_live
we need the following index:
CREATE NONCLUSTERED INDEX [IX_merchant_id_transaction_dt] ON [dbo].[transaction_t]
(
merchant_id,
transaction_dt -- you can put DESC here, but it should not matter
) INCLUDE (trans_live)
The order of columns in this index is important.
You have an index on just transaction_dt
. This query might use it, but it would be not as efficient as on (merchant_id, transaction_dt)
. Your current index is useful if you have queries that filter by transaction date without looking at the merchant_id
. If you don't have such queries, you'd better drop it. Having too many indexes "just in case" may be a problem for optimizer, and it slows down updates and inserts.
For efficient retrieval of the last last_IBA_transaction_dt
we'll need this index:
CREATE NONCLUSTERED INDEX [IX_merchant_id_bank_txt_transaction_dt] ON [dbo].[transaction_t]
(
merchant_id,
bank_txt,
transaction_dt -- you can put DESC here, but it should not matter
)
Again, the order of columns in this index is important.
If you don't want to create two indexes specifically for this query, you can try just one index, which is great for getting trans_live
and should somewhat help with last_IBA_transaction_dt
.
CREATE NONCLUSTERED INDEX [IX3] ON [dbo].[transaction_t]
(
merchant_id,
transaction_dt DESC
) INCLUDE (trans_live, bank_txt)
您可以尝试使用前两个索引来衡量性能,然后仅使用第三个索引来进行比较。
顺便说一句,如果在给定的日期范围内有商家没有任何交易,则查询将为这些商家返回一行。将COUNT
在原来的查询将返回1
这些商家。可能这不是您想要的。
要返回0
这些商家的计数,该COUNT
函数应为COUNT(tt.id)
。我在上面的代码中做了这些更改。
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我来说两句