【发布时间】：2016-10-05 19:45:12
【问题描述】：
我有以下查询，它按预期工作，但需要很长时间才能执行。
为了获得结果，我已经获取了临时表中的记录，然后应用 groupby 来获得最终结果
SELECT *
INTO #temp From (
select A.*,B.*
from (
select e.Id,e.code,e.Fname,
(select ComboValue from dbo.comvals where Id = c.BUDHOL) as [BUDHOL],
(select ComboValue from dbo.comvals where Id = c.COMPANY) as [COMPANY],
(select ComboValue from dbo.comvals where Id = c.BENEFICIARY) as [BENEFICIARY],
(select ComboValue from dbo.comvals where Id = c.SPARE2) as [SPARE2],
(select ComboValue from dbo.comvals where Id = c.SPARE1) as [SPARE1],
(select ComboValue from dbo.comvals where Id = c.EXPORG) as [EXPORG],
(select ComboValue from dbo.comvals where Id = c.EXPTYPE) as [EXPTYPE],
(select ComboValue from dbo.comvals where Id = c.OBJECTIVE) as [OBJECTIVE],
(select ComboValue from dbo.comvals where Id = c.TASKNO) as [TASKNO],
(select ComboValue from dbo.comvals where Id = c.PROJECTNO) as [PROJECTNO]
from dbo.EmployeeDetail e
left join (
select *
from (
select CustomeFieldName,FieldValue,CompanyId,EmployeeId
from dbo.CustomeFieldDetail
where CustomeFieldName in ('BENEFICIARY','BUDHOL','COMPANY', 'EXPORG','EXPTYPE','OBJECTIVE','PROJECTNO','SPARE2','SPARE1','TASKNO','COMPANY') and CompanyId = 1
)as src
pivot (max(FieldValue) for CustomeFieldName in ([BENEFICIARY],[BUDHOL],[EXPORG],[EXPTYPE],[OBJECTIVE],[PROJECTNO],[SPARE2],[SPARE1],[TASKNO],[COMPANY])
) as src2
) c on e.Id = c.EmployeeId and e.CompanyId = c.CompanyId and e.DateOfJoining <= convert(datetime,'30/03/2016',103) and e.CompanyId = 1
where e.Companyid=1 --order by e.Code
) A
Full Outer join (
select
T.EmployeeId,
X.[FieldName],
X.[Value]
from dbo.EmpTransaction T
cross apply (
SELECT
T.c.value('(@Name)[1]', 'Varchar(max)') AS [FieldName],
convert(float,T.c.value('(@Value)[1]', 'Varchar(max)')) AS [Value]
FROM TransactionFieldDetails.nodes('//PayDetails/Column') T(c)
where CompanyId = 1 and ProcessDate = convert(datetime,'01/03/2016',103) and CategoryId in (1)
and T.c.value('(@Name)[1]', 'Varchar(max)') in('FB')
) X
) B
ON A.id= B.EmployeeId
) As x
临时表上的最终 GroupBy 条件
SELECT B.BENEFICIARY,
B.BUDHOL,
B.COMPANY,
B.FIELDNAME,
B.OBJECTIVE,
B.SPARE1,
B.SPARE2,
B.PROJECTNO,
B.TASKNO,
B.EXPORG,
B.EXPTYPE,
SUM(B.value)
FROM (
SELECT DISTINCT A.BENEFICIARY,
A.BUDHOL,
A.COMPANY,
A.FIELDNAME,
A.OBJECTIVE,
A.value,
A.SPARE2,
A.SPARE1,
A.PROJECTNO,
A.TASKNO,
A.EXPORG,
A.EXPTYPE
FROM (
SELECT t.BENEFICIARY,
t.BUDHOL,
t.COMPANY,
t.FIELDNAME,
t.OBJECTIVE,
t.SPARE1,
t.SPARE2,
t.PROJECTNO,
t.TASKNO,
t.EXPORG,
t.EXPTYPE,
t.value value
FROM #temp T, #temp TT
) A
LEFT JOIN #temp T1 ON A.BENEFICIARY = t1.BENEFICIARY
AND A.BUDHOL = t1.BUDHOL
AND A.COMPANY = t1.COMPANY
AND A.OBJECTIVE = t1.OBJECTIVE
AND A.SPARE1 = t1.SPARE1
AND A.SPARE2 = t1.SPARE2
AND A.PROJECTNO = t1.PROJECTNO
AND A.TASKNO = t1.TASKNO
AND A.EXPORG = t1.EXPORG
AND A.EXPTYPE = t1.EXPTYPE
) B
GROUP BY B.BENEFICIARY,
B.BUDHOL,
B.COMPANY,
B.OBJECTIVE,
B.FIELDNAME,
B.SPARE1,
B.SPARE2,
B.PROJECTNO,
B.TASKNO,
B.EXPORG,
B.EXPTYPE
Above Query 工作正常且符合预期。 需要知道上面的查询是否可以优化，这样我就可以花更少的时间来执行目前它需要超过 2 分钟来执行，我们也可以结合两个查询，即我不想使用 #temp 表
【问题讨论】：
-
请提供你的执行计划（sqlplan格式）
-
为什么要做这个交叉连接？ : 从#temp T,#temp TT
-
@vercelli 交叉连接以获取所有可能的列组合和值的总和
-
@Devart 执行计划有点无法正确复制。我应该为您提供 xml 格式而不是可视化
-
@Nilesh，您将所有行乘以所有其他行。 10 行给你每行 10 次。不是“列值的组合”。您已经拥有的所有此类“组合” - 这些是您表中的行。您不会通过该交叉连接获得任何 new 行。接下来
left join完全没有意义。您刚刚从该表中选择 - 加入后会出现哪些“惊喜”？
标签： sql sql-server sql-server-2008 group-by temp-tables