桌子:
CREATE TABLE appointment
(
id bigserial NOT NULL,
date_of_visit timestamp without time zone NOT NULL,
symptoms text[],
diseases text[],
lab_tests text[],
prescription_id bigint NOT NULL,
medicines jsonb,
CONSTRAINT appointment_pkey PRIMARY KEY (id),
CONSTRAINT appointment_prescription_id_fkey FOREIGN KEY (prescription_id)
REFERENCES prescription (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
WITH (
OIDS=FALSE
);
插入语句:
INSERT INTO appointment values(
1,
now(),
'{"abc","def","ghi"}',
'{"abc","def","ghi"}',
'{"abc","def","ghi"}',
1,
'[{"sku_id": 1, "company": "Magnafone"}, {"sku_id": 2, "company": "Magnafone"}]')
我正在尝试针对postgres中的jsonb数组类型列进行查询。我手头有一些解决方案,如下所示。莫名其妙,它不起作用错误是- Cannot extract elements from a scalar
。
SELECT distinct(prescription_id)
FROM appointment
WHERE to_json(array(SELECT jsonb_array_elements(medicines) ->>'sku_id'))::jsonb ?|array['1']
LIMIT 2;
更新:查询运行正常。由于其他行中的某些行未运行,因此该列中存在一些不需要的值。
表中的行包含列medicines
而不是数组的标量值。您应该检查并正确更新数据。您可以通过以下查询找到这些行:
select id, medicines
from appointment
where jsonb_typeof(medicines) <> 'array';
或者,您可以在查询的此列中检查值的类型:
select prescription_id
from (
select distinct on (prescription_id)
prescription_id,
case
when jsonb_typeof(medicines) = 'array' then jsonb_array_elements(medicines) ->>'sku_id'
else null
end as sku_id
from appointment
) alias
where sku_id = '1'
limit 2;
或简单地排除以下非数组值where clause
:
select prescription_id
from (
select distinct on (prescription_id)
prescription_id,
jsonb_array_elements(medicines) ->>'sku_id' as sku_id
from appointment
where jsonb_typeof(medicines) = 'array'
) alias
where sku_id = '1'
limit 2;
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