错误时的SQL情况

Question

Hello my sql query still returns else case but I am pretty sure that inner select returns 1. What`s wrong with the code?

SELECT CASE a_from
WHEN (SELECT a_from REGEXP 'something.com>$' = 1 )
     THEN "S"
ELSE "T"
END AS 'HP', a_from FROM article WHERE id =4

Answer 1

您可能在内部选择中缺少WHERE

(SELECT a_from REGEXP WHERE 'something.com>$' = 1 )

Answer 2

I think you missed the where in your inner select statement.

SELECT CASE a_from
WHEN (SELECT a_from REGEXP where 'something.com>$' = 1 )  <-- Here 
     THEN "S"
ELSE "T"
END AS 'HP', a_from FROM article WHERE id =4

As commented by ypercube you may try like this:

SELECT CASE WHEN a_from REGEXP 'something.com>$' = 1 
 THEN 'S' 
ELSE 'T' END AS hp, a_from 
FROM article WHERE id = 4 ;