如何加入兩個sql語句
[英]How to join two sql statements
I have two queries which return correct results. One of them is:
我有兩個查詢返回正確的結果。其中之一是:
select distinct epr.DepartmentCode
from [dbo].[EmployeePayRates] epr
join [dbo].[EmployeeTimecards] et on epr.EmployeeID = et.EmployeeID
where StoreID = 89
It checks all the distinct departments employees ever checked in in the store 89. Query returns:
它檢查在商店89中簽入的所有不同部門員工。查詢返回:
DepartmentCode
1
2
5
Second query is:
第二個查詢是:
SELECT DISTINCT
DepartmentCode, count(DISTINCT EmployeeID)
FROM [dbo].[EmployeeTimecards]
WHERE EmployeeTimecardDate = '2013-11-25'
AND StoreID = 89
GROUP BY
DepartmentCode
It returns the number of employees in each department today at the store 89. Table looks like:
它返回商店89中每個部門的員工數量。表格如下:
DepartmentCode EmployeeCount
1 17
5 7
And I'm trying to make it look like:
而我正試圖讓它看起來像:
DepartmentCode EmployeeCount
1 17
2 0
5 7
I will really appreciate if somebody will show me how to join these queries. Thanks in advance.
如果有人會告訴我如何加入這些查詢,我將非常感激。提前致謝。
2 个解决方案
#1
3
You can move your first query into a subquery, then LEFT JOIN back to your table, and perform the same count:
您可以將第一個查詢移動到子查詢中,然后將LEFT JOIN移回到您的表中,並執行相同的計數:
WITH DepartmentCodes AS
( SELECT DISTINCT epr.DepartmentCode
FROM [dbo].[EmployeePayRates] epr
JOIN [dbo].[EmployeeTimecards] et
ON epr.EmployeeID = et.EmployeeID
WHERE StoreID = 89
)
SELECT dc.DepartmentCode,
EmployeeCount = COUNT(DISTINCT c.EmployeeID)
FROM DepartmentCodes dc
LEFT JOIN [dbo].[EmployeeTimecards] c
ON dc.DepartmentCode = c.DepartmentCode
AND EmployeeTimecardDate = '20131125'
AND StoreID = 89
GROUP BY dc.DepartmentCode;
As an aside I changed your string literal date to the culture invariant format yyyyMMdd because even the ISO Standard yyyy-MM-dd can be misinterpreted as yyyy-dd-MM in some regions. Although not the main point of the article Aaron Bertrand covers this formatting issue in his article mis-handling date / range queries
另外,我將字符串文字日期更改為文化不變格式yyyyMMdd,因為即使是ISO標准yyyy-MM-dd也可能在某些地區被誤解為yyyy-dd-MM。雖然不是文章的主要內容Aaron Bertrand在他的文章錯誤處理日期/范圍查詢中涵蓋了這種格式問題
#2
0
I choose to use a Common Table expression to join the two queries. Check out my CTE article on my blog - http://craftydba.com/?p=1234.
我選擇使用Common Table表達式來連接兩個查詢。在我的博客上查看我的CTE文章 - http://craftydba.com/?p=1234。
--
-- Join cteDeptCode 2 cteEmpPerDept
--
;
with cteDeptCode (DeptCode) as
(
select distinct epr.DepartmentCode
from [dbo].[EmployeePayRates] epr
join [dbo].[EmployeeTimecards] et
on epr.EmployeeID = et.EmployeeID
where StoreID = 89
),
cteEmpPerDept(DeptCode, EmpCnt) as
(
SELECT DISTINCT
DepartmentCode, count(DISTINCT EmployeeID)
FROM [dbo].[EmployeeTimecards]
WHERE
EmployeeTimecardDate = '2013-11-25' AND StoreID = 89
GROUP BY DepartmentCode
)
select d.DeptCode, a.EmpCnt
from cteDeptCode d
left join cteEmpPerDept e
on d.DeptCode = e.DeptCode
注意！
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