Question

我想只选择具有最大优先级的id，以及item_id为1001的下表（table1）。

表1

id  | plan_id | item_id | plan_item_bundle_id | precedence 
-----+---------+---------+---------------------+------------

 401 |         |    1001 |                     |         -1

 402 |         |    1001 |                     |         -1

我该怎么办？感谢

我不在乎优先级是否相同，任何人都会这样做。感谢

Answer 1

select id from table1
group by id, prededence
having precedence = max(precedence )
Limit 0, 1

Answer 2

尝试此查询

select id from table1 where precedence =(select max(precedence) from table1)

Answer 3

你可以尝试：

SELECT id FROM table1 
WHERE precedence = MAX(precedence)
  AND item_id = 1001
LIMIT 1

或

SELECT id FROM table1 
WHERE precedence = (SELECT MAX(precedence) FROM table1)
  AND item_id = 1001
LIMIT 1

如果sql中有多个最大值，请选择一行的id

3 个答案: