在 MySQL 5.6 中总是“发送数据”

Posted 2023-04-14

【中文标题】在 MySQL 5.6 中总是“发送数据”

【英文标题】：Always "Sending Data" In MySQL 5.6

【发布时间】：2021-09-16 22:53:50

【问题描述】：

我正在运行此查询，但在进程列表中此状态为“正在发送数据”，我尝试使用 Maria DB 10 此查询成功运行，但在 mysql 5.6.44 中始终发送数据， 你能帮我解决这个问题吗

表格/视图 v_stock

PartName	Qty Stock
A	10

tbl_cummulative

id	cummulativeQty	qtyOrder	qtyStore	partName	mscode	fob	refreshDate
A	5	15	20	A	AA	2021-01-01	2021-01-01
A	0	5	20	A	AA	2021-01-02	2021-01-01
A	-5	5	20	A	AA	2021-01-03	2021-01-01
A	-10	5	20	A	AA	2021-01-04	2021-01-01

select s.partName AS partName,
group_concat(distinct c.mscode separator ',') AS model,
(select min(cum.fob) from dbbomv2.tbl_cummulative cum where cum.partName = s.partName and cum.cummulativeQty < 0) AS fob,
s.qtyStock AS qtyStock,
sum(c.qtyOrder) AS qtyOrder,
min(c.cummulativeQty) AS qtyShortage,
(
    select min(dbbomv2.tbl_cummulative.cummulativeQty) AS cummulativeQty 
    from dbbomv2.tbl_cummulative 
    where dbbomv2.tbl_cummulative.fob = (select min(cum.fob) from dbbomv2.tbl_cummulative cum where cum.partName = s.partName and cum.cummulativeQty < 0) 
    and dbbomv2.tbl_cummulative.partName = s.partName and dbbomv2.tbl_cummulative.cummulativeQty < 0
) AS qtyOrderClosest 
from (dbbomv2.v_stock s 
left join 
dbbomv2.tbl_cummulative c on(s.partName = c.partName)) 
group by s.partName 
order by c.fob is null,c.fob,s.partName

我需要这样的桌子

partName	model	fob	qtyStock	qtyOrder	qtyShortage	fobqtyOrderClosest
A	AA	2021-01-03	20	5	-5	2021-01-03

这个 MySQL 5.6.44

这个 Maria DB 10

【问题讨论】：

检查如果缓冲区太小会显示的mysql

使用 EXPLAIN 分析两台服务器中查询的优化计划。查找所选索引和检查的行数之间的差异。

【参考方案1】：

解决，我删除此查询并在程序中运行此查询

(
    select min(dbbomv2.tbl_cummulative.cummulativeQty) AS cummulativeQty 
    from dbbomv2.tbl_cummulative 
    where dbbomv2.tbl_cummulative.fob = (select min(cum.fob) from dbbomv2.tbl_cummulative cum where cum.partName = s.partName and cum.cummulativeQty < 0) 
    and dbbomv2.tbl_cummulative.partName = s.partName and dbbomv2.tbl_cummulative.cummulativeQty < 0
) AS qtyOrderClosest