查询Mysql有什么问题？

Question

有一个简单的SQL查询：

SELECT enterprise_invoces.AC_name, 
enterprise_invoces.AC_id, 
enterprise_invoces.AC_code, 
ABS(SUM(IF(AT_amount>0, AT_amount, 0)) AS debit,
ABS(SUM(IF(AT_amount <0, AT_amount, 0)) AS credit 
    FROM account_transactions 
    INNER JOIN enterprise_invoces ON enterprise_invoces.AC_id = account_transactions.AT_code

我收到此错误消息：

> # 1064 - You have an error in the request. Check the MySQL version documentation for correct syntax near 'FROM account_transactions INNER
> JOIN enterprise_invoces ON enterprise_invoces.AC' on line 1

Answer 1

您需要将方括号括起来：

SELECT enterprise_invoces.AC_name, 
  enterprise_invoces.AC_id, 
  enterprise_invoces.AC_code, 
  ABS(SUM(IF(AT_amount>0, AT_amount, 0))) AS debit,  --here
  ABS(SUM(IF(AT_amount <0, AT_amount, 0))) AS credit  -- here
FROM account_transactions 
JOIN enterprise_invoces 
  ON enterprise_invoces.AC_id = account_transactions.AT_code
 GROUP BY enterprise_invoces.AC_name,
          enterprise_invoces.AC_id,
          enterprise_invoces.AC_code   -- there should be corresponding `GROUP BY`