Question

SELECT CONCAT(firstname," ",lastname," ",CASE dept_id
WHEN  '1'    THEN  'ITD'
WHEN  '4'    THEN  'FMAD'
WHEN  '6'    THEN  'GCSMD'
WHEN  '7'    THEN  'SSHED'
WHEN  '10'   THEN  'GPD'
ELSE  'Z_ISDC'
END AS ayam) as staffname
FROM ost_staff

我想要staffname的输出是“John Doe ITD”但是它不起作用。

Answer 1

试试这个，您的CASE格式不正确。

SELECT 
CONCAT(firstname," ",lastname," ",
CASE WHEN dept_id = '1' THEN 'ITD' 
     WHEN dept_id = '4' THEN 'FMAD' 
     WHEN dept_id = '6' THEN 'GCSMD' 
     WHEN dept_id = '7' THEN 'SSHED' 
     WHEN dept_id = '10' THEN 'GPD' ELSE 'Z_ISDC' END) 
as staffname 
FROM ost_staff

此外，您无法命名CASE，END需要一个简单的CASE。

Answer 2

从AS ayam的{{1}}删除CASE。

当您使用END子句的结果作为CASE的参数时，您不能使用别名。

MYSQL使用concat与case

2 个答案: