Question

我有以下mysql查询来获取每个账单的总金额和税额。

SELECT b.bill_no
     , b.total_amount
     , b.created_at
     , b.id
     , ( SELECT sum(gst_amt) 
        FROM bill_contents_pharmacy bc 
       WHERE bc.bill_id = b.id) as tgst 
  FROM bills b 
 WHERE b.bill_type = 'pharmacy' 
   AND cast(b.cr_at as date) >= '2017-08-01' 
   AND cast(b.cr_at as date) <= '2017-08-23' 
   AND b.is_cancelled = 0 
   AND b.is_deleted = 0 
 ORDER 
  BY b.bill_no ASC

这个查询在我的PHP代码中大约需要10分钟，但是当我在phpmyadmin中运行它时，它只用了3.6秒。我做错了什么？

Answer 1

问题似乎是子查询。请尝试使用连接。

SELECT b.bill_no, b.total_amount,b.created_at, b.id, sum(bc.gst_amt) as tgst 
FROM bills b LEFT JOIN bill_contents_pharmacy bc ON (bc.bill_id = b.id)
WHERE b.bill_type = 'pharmacy' AND cast(b.cr_at as date) >= '2017-08-01' 
AND cast(b.cr_at as date) <= '2017-08-23' 
AND b.is_cancelled IS FALSE AND b.is_deleted IS FALSE 
GROUP BY b.bill_no, b.total_amount, b.created_at, b.id
ORDER BY b.bill_no ASC

此外，可能没有必要进行铸造。

Answer 2

你也可以尝试这个，你必须在账单和bill_contents_pharmacy表上创建关系并创建索引。

SELECT b.bill_no, b.total_amount, b.created_at, b.id, sum(bc.gst_amt) as tgst
FROM bills b
JOIN bill_contents_pharmacy bc ON bc.bill_id = b.id
WHERE b.bill_type = 'pharmacy'
AND cast(b.cr_at as date) >= '2017-08-01'
AND cast(b.cr_at as date) <= '2017-08-23'
AND b.is_cancelled = 0
AND b.is_deleted = 0 
GROUP BY b.bill_no, b.total_amount, b.created_at, b.id
ORDER BY b.bill_no ASC

这必须加快查询速度

Mysql查询需要大约10分钟才能执行

2 个答案: