mysql - mysql 不工作的情况

Question

SELECT SUM(amount) as tdb 
FROM (`v_ledger_details`) 
WHERE `debit_credit` = 'DB' 
AND `CASE` WHEN transaction_type_id IN(4,5) 
           THEN billDate < "2016-06-01" 
           ELSE postingDate < "2016-06-01" 
     END 
AND accountId = '944'

上面的查询有什么问题。我需要 where 中的 case 子句，但该查询给了我错误。

Answer 1

不要在 where 子句中使用 case。通常只在 select 子句中使用它。然后不要反引号 case 关键字

SELECT SUM(amount) as tdb 
FROM v_ledger_details
WHERE `debit_credit` = 'DB' 
AND accountId = '944'
AND 
(
    (transaction_type_id IN (4,5) and billDate < '2016-06-01') OR
    (transaction_type_id NOT IN (4,5) AND postingDate < '2016-06-01')
)