Question

我在这里遇到一个主要的问题：

select
`produsereceptie`.`receptie_id` AS `document_id`,`receptie` AS `receptie`,
`produsereceptie`.`produs_id` AS `produs_id`,
`produse`.`cod` AS `cod`,
`produse`.`denumire` AS `denumire`,
`produsereceptie`.`gestiune` AS `gestiune`,
sum(`produsereceptie`.`qty`) AS `qtyIn`,
ifnull((select sum(`productie`.`qtyConsumat`) FROM `productie` where (`productie`.`produs_id` = `produsereceptie`.`produs_id`) group by `produsereceptie`.`produs_id`),0) AS `qtyOut` 
from (`produsereceptie` join `produse` on((`produse`.`id` = `produsereceptie`.`produs_id`))) 
group by `produsereceptie`.`produs_id` 
union select `comenzimonitorizari`.`idx` AS `document_id`,
'productie' AS `productie`,`produse`.`id` AS `id`,
`produse`.`cod` AS `cod`,`produse`.`denumire` AS `denumire`,
'productie' AS `productie`,sum(`comenzimonitorizari`.`produse_conforme`) AS `qtyIn`,
ifnull((select sum(`produseiesire`.`qty`) from `produseiesire` 
where (`produseiesire`.`produs_id` = `produse`.`id`) 
group by `comenzimonitorizari`.`produs_cod`),0) AS `qtyOut` 
from (`comenzimonitorizari` join `produse` on ((`produse`.`cod` = `comenzimonitorizari`.`produs_cod`))) 
group by `comenzimonitorizari`.`produs_cod`;

sql说明是附图（http://postimg.org/image/vysy9i6ab/）

任何帮助都是最受欢迎的，因为我不知道如何优化它。

平均时间大约是9-10秒......而我在这里面临的是地狱。

Answer 1

尝试UNION ALL而不是UNION。希望它有所帮助

<强>更新

我无法测试数据，但我会说问题在于这一行：

ifnull((select sum(`productie`.`qtyConsumat`) FROM `productie` where (`productie`.`produs_id` = `produsereceptie`.`produs_id`) group by `produsereceptie`.`produs_id`),0) AS `qtyOut`

首先尝试使用

之类的内容删除此查询替换它

0 AS `qtyOut`

你现在几次？

Union Select - 重CPU负载

1 个答案: