我正在使用一个Oracle数据库,其中有一个包含20条记录的表
CREATE TABLE MyTable (
MY_RECORD_ID NUMBER PRIMARY KEY,
SOME_DATA_1 VARCHAR2(200),
SOME_DATA_2 VARCHAR2(200)
);
INSERT INTO MyTable VALUES (1, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (2, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (3, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (4, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (5, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (6, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (7, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (8, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (9, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (10, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (11, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (12, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (13, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (14, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (15, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (16, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (17, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (18, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (19, 'BLAH1', 'BLAH2');
INSERT INTO MyTable VALUES (20, 'BLAH1', 'BLAH2');
我想做的是遍历此表,一次基于该MY_RECORD_ID
列选择5条记录。该OFFSET
和FETCH
命令似乎让我做到这一点:
SELECT *
FROM MyTable
ORDER BY MY_RECORD_ID
OFFSET 0 ROWS -- start at the first row
FETCH NEXT 5 ROWS ONLY;
我想将上述语句插入循环中,以便可以对五行中的每一行执行数据操作(这样总共执行4次)。有没有办法使用存储过程来做到这一点?
您可以对此类请求使用分析功能
SELECT my_record_id, some_data_1, some_data_2
FROM (
SELECT CEIL(ROW_NUMBER() OVER(ORDER BY mt.my_record_id) / 5/*set the page size*/) page_id
,mt.*
FROM MyTable mt
) t
WHERE page_id = 1 /* set the desired page*/
ORDER BY my_record_id
您可以查看此文档
分析功能
https://docs.oracle.com/cd/E11882_01/server.112/e41084/functions004.htm#SQLRF06174
问汤姆
https://asktom.oracle.com/pls/asktom/f?p=100:11:0:::::P11_QUESTION_ID:1137577300346084930
其他例子
https://blogs.oracle.com/oraclemagazine/on-top-n-and-pagination-queries
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