Question

我目前正在使用以下SQL从我们的某个数据库生成一些统计信息，但是创建的2个初始临时表使用几乎相同的SELECT语句。

是否可以重写此内容并避免使用两个几乎相同的语句？

感谢您提供的任何帮助！

    ------------------------------------------------------------------------------------------------------------------------------------------------------------------ QUERY
DECLARE         @StartDate  DATE,
                @EndDate    DATE
SELECT          @StartDate  = ('2015-08-20'),
                @EndDate    = DateAdd(day,1,@StartDate) 
-------------------------------------------------------------------------------------------- Create Temp Tables
------------------------------------------------ #Submitted
SELECT DISTINCT(e.[EmployeeId])
INTO [#Submitted]
FROM [Activity] a
INNER JOIN [Employee] e ON e.[EmployeeId] = a.[EmployeeId]
INNER JOIN [ActivityTypeLookup] atl ON atl.[ActivityTypeID] = a.[ActivityTypeId]
WHERE e.[EmployeeId] > 1
        AND e.[EmployeeTypeId] = 1
        AND a.[ImpersonatorId] > 1
        AND atl.[ActivityTypeID] = 22 -- 22 = Submit Command
        AND a.[TimeStamp] >= @StartDate
        AND a.[TimeStamp] < @EndDate
        AND e.[LeavingDate] IS NULL
------------------------------------------------ #LoggedIn
SELECT DISTINCT(e.[EmployeeId])
INTO [#LoggedIn]
FROM [Activity] a
INNER JOIN [Employee] e ON e.[EmployeeId] = a.[EmployeeId]
INNER JOIN [ActivityTypeLookup] atl ON atl.[ActivityTypeID] = a.[ActivityTypeId]
WHERE e.[EmployeeId] > 1
        AND e.[EmployeeTypeId] = 1
        AND a.[ImpersonatorId] > 1
        AND atl.[ActivityTypeID] = 1 -- 1 = Signed In
        AND a.[TimeStamp] >= @StartDate
        AND a.[TimeStamp] < @EndDate
        AND e.[LeavingDate] IS NULL
-------------------------------------------------------------------------------------------- / Create Temp Tables

------------------------------------------------ Output Data
SELECT DISTINCT e.[EmployeeKey],
       e.[FirstName],
       e.[LastName],
       [Description] = CASE
                            WHEN s.[EmployeeId] IS NOT NULL THEN 'Submitted Command' 
                            WHEN li.[EmployeeId] IS NOT NULL THEN 'Logged In' ELSE 'Not Logged In' 
                        END,
        e.[Email]
FROM [Employee] e
INNER JOIN [Activity] a ON e.[EmployeeId]=a.[EmployeeId]
LEFT JOIN [#Submitted] s ON e.[EmployeeId]=s.[EmployeeId]
LEFT JOIN [#LoggedIn] li ON e.[EmployeeId]=li.[EmployeeId]
WHERE e.[LeavingDate] IS NULL
        AND e.[EmployeeTypeId] = 1
        AND a.[ImpersonatorId] > 1
        ORDER BY [Description]

------------------------------------------------ Drop Temp Tables
DROP TABLE #LoggedIn
DROP TABLE #Submitted
------------------------------------------------------------------------------------------------------------------------------------------------------------------ / QUERY

Answer 1

在<asp:GridView>条款中，您可以同时过滤WHERE，然后按照以下方式对该ID进行ActivityTypeID .. CASE：

WHEN

Answer 2

请检查以下脚本你可以看到你不需要临时表对不起，如果有一些语法错误：）

SELECT DISTINCT e.[EmployeeKey],
       e.[FirstName],
       e.[LastName],
       [Description] = CASE
                            WHEN atl.[ActivityTypeID] = 22 THEN 'Submitted Command' 
                            WHEN atl.[ActivityTypeID] = 1 THEN 'Logged In' 
                            ELSE 'Not Logged In' 
                        END,
        e.[Email]
FROM [Employee] e
INNER JOIN [Activity] a ON e.[EmployeeId]=a.[EmployeeId]
INNER JOIN [ActivityTypeLookup] atl ON atl.[ActivityTypeID] = a.[ActivityTypeId]
WHERE e.[LeavingDate] IS NULL
        AND e.[EmployeeTypeId] = 1
        AND a.[ImpersonatorId] > 1
        and atl.[ActivityTypeID] IN (1, 22)
        AND a.[TimeStamp] >= @StartDate
        AND a.[TimeStamp] < @EndDate
        AND e.[LeavingDate] IS NULL
        ORDER BY [Description]

我可以重写此SQL以删除重复的代码吗？

2 个答案: