我有一个简单的表“TABLE_1”如何优化SQL查询来实现最小执行时间
Org Customer Code Ordered Deleted Confirmed
RU Cust_1 A 1000 800 200
RU Cust_2 B 300 0 300
US Cust_3 C 800 100 700
RU Cust_4 B 100 100 0
US Cust_5 C 400 200 200
RU Cust_6 B 500 300 200
现在我需要改变这个表中的行,其中“已删除” <> 0喜欢
Org Code Customers Ordered Confirmed
RU A Cust_1 1000 200
RU B Cust_4, Cust_6 600 200
US C Cust_3, Cust_5 1200 900
我使用下面的查询和功能
SELECT T1.Org,
T1.Code,
dbo.FUNC(T1.Code, T1.Org) AS 'Customers',
'Ordered' = (SELECT SUM(Ordered) FROM TABLE_1 AS T2 WHERE T2.Customer = T1.Customer AND T2.Code = T1.Code AND T2.Deleted<>0),
'Confirmed' = (SELECT SUM(Confirmed) FROM TABLE_1 AS T3 WHERE T3.Customer = T1.Customer AND T3.Code = T1.Code AND T3.Deleted<>0)
FROM TABLE_1 AS T1
WHERE T1.Deleted <> 0
功能 'FUNC':
ALTER FUNCTION [dbo].[FUNC] (@c VARCHAR(MAX), @org VARCHAR(MAX))
RETURNS VARCHAR(MAX) AS BEGIN
DECLARE @p VARCHAR(MAX) ;
SET @p = '' ;
SELECT @p = @p + T1.Customer + ', '
FROM TABLE_1 AS T1
WHERE T1.Code = @c AND T1.Org = @org AND T1.Deleted <> 0
GROUP BY T1.Customer
RETURN SUBSTRING(@p, 1, LEN(@p) - 1)
END
我认为这不是如何得到结果的最佳方式,特别是如果我有一张大桌子。 有更好的解决方案吗?
编辑: 表DDL例如
CREATE TABLE [dbo].[TABLE_1](
[Org] [nchar](10) NULL,
[Customer] [nchar](100) NULL,
[Code] [nchar](10) NULL,
[Ordered] [decimal](18,1) NULL,
[Deleted] [decimal](18,1) NULL,
[Confirmed] [decimal](18,1) NULL)
ON [PRIMARY]
你真的想在连接字符串中TSQL,有没有表现层? – Jodrell 2013-05-08 08:21:26
我不知道我明白你的意思。我应该在查询中使用串联而不是函数吗? – mbigun 2013-05-08 08:45:53
对于相同的客户,组织和代码是否有可能拥有多行?如果是这样,大多数提供的答案(到目前为止)将不会正确工作,而不需要针对不同的客户进行修复。 – 2013-05-08 09:01:42