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SELECT 'id' FROM `table` WHERE `id` =
(select min(`id`) FROM `table` where
`id` < 1 and `ids` = 1)
id ids
1 1
2 1
5 1
6 1
id = ''
我需要改变id=''
到id='n/a'
SELECT 'id' FROM `table` WHERE `id` =
(select min(`id`) FROM `table` where
`id` < 1 and `ids` = 1)
id ids
1 1
2 1
5 1
6 1
id = ''
我需要改变id=''
到id='n/a'
如果查询返回一个空的结果,你可以使用COALESCE这样:
SELECT COALESCE('id','N/A') FROM ...
,或者如果回报结果是您可以执行的空字符串:
SELECT CASE WHEN id = '' THEN 'N/A' ELSE id END FROM ...
另一种选择是:IFNULL