从现有 table 创建新的 SQL 服务器 table

Question

我的工作是更新数据库 table，方法是删除月份列并重新创建 table 列字段分组并对小时列求和。

这是我的说明："Create a new PS_StaffHours table without the Month column. Migrate the existing PS_StaffHours data to the new table by grouping on (PSScnID/PSEmpID/Prd/WBSID/RatePrd) and summing the hours."

现在这是 table 我编写的脚本，必须在没有月份列和小时列求和的情况下重新创建：

CREATE TABLE [dbo].[PS_StaffHours]
(
    [PSScnID] [int] NOT NULL,
    [PSEmpID] [int] NOT NULL,
    [Prd] [int] NOT NULL,
    [WBSID] [int] NOT NULL,
    [RatePrd] [int] NOT NULL,
    [Month] [date] NOT NULL,
    [Hours] [decimal](16, 8) NOT NULL,

   CONSTRAINT [PK_PS_StaffHours] 
       PRIMARY KEY CLUSTERED ([PSScnID] ASC, [PSEmpID] ASC, [Prd] ASC,
                              [WBSID] ASC, [RatePrd] ASC, [Month] ASC)
                   WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, 
                         IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[PS_StaffHours] WITH CHECK 
    ADD CONSTRAINT [FK_PS_StaffHours_PS_Scenarios] 
        FOREIGN KEY([PSScnID]) REFERENCES [dbo].[PS_Scenarios] ([PSScnID])
GO

ALTER TABLE [dbo].[PS_StaffHours] CHECK CONSTRAINT [FK_PS_StaffHours_PS_Scenarios]
GO

ALTER TABLE [dbo].[PS_StaffHours] WITH CHECK 
    ADD CONSTRAINT [FK_PS_StaffHours_PS_Staff] 
        FOREIGN KEY([PSScnID], [PSEmpID]) REFERENCES [dbo].[PS_Staff] ([PSScnID], [PSEmpID])
GO

ALTER TABLE [dbo].[PS_StaffHours] CHECK CONSTRAINT [FK_PS_StaffHours_PS_Staff]
GO

ALTER TABLE [dbo].[PS_StaffHours] WITH CHECK 
    ADD CONSTRAINT [FK_PS_StaffHours_PS_WBS] 
        FOREIGN KEY([PSScnID], [WBSID]) REFERENCES [dbo].[PS_WBS] ([PSScnID], [WBSID])
GO

ALTER TABLE [dbo].[PS_StaffHours] CHECK CONSTRAINT [FK_PS_StaffHours_PS_WBS]
GO

ALTER TABLE [dbo].[PS_StaffHours] WITH CHECK 
    ADD CONSTRAINT [CK_PS_StaffHours] CHECK ((DATEPART(day, [Month]) = (1)))
GO

ALTER TABLE [dbo].[PS_StaffHours] CHECK CONSTRAINT [CK_PS_StaffHours]
GO

EXEC sys.sp_addextendedproperty 
         @name = N'MS_Description', 
         @value = N'Restricts Month field to the 1st of every month.' , 
         @level0type = N'SCHEMA', @level0name = N'dbo',  
         @level1type = N'TABLE', @level1name = N'PS_StaffHours',  
         @level2type = N'CONSTRAINT', @level2name = N'CK_PS_StaffHours'
GO

首先，要创建新的 table 我想我所要做的就是重命名脚本的 CREATE 部分中的 table 名称，然后删除对月列的所有引用创建语句。我对 CREATE 脚本的看法是否正确？

现在，这是我要用来填充没有月份字段的 table 的脚本，但我不确定我的分组是否正确，因为我收到错误消息，因为我' m 不 grouping 与其余部分一起出现在“小时”列中。另外，我不确定如何处理 summing 查询中的时间。

我的代码：

SELECT c.PSScnID, c.PSEmpID, c.Prd, c.WBSID, c.RatePrd, c.Hours  
INTO dbo.NewPS_StaffHours 
FROM PS_StaffHours AS c  
GROUP BY c.PSScnID, c.PSEmpID, c.Prd, c.WBSID, c.RatePrd  
GO

Answer 1

你的第一个假设是正确的。要按您的列分组并总结时间 - 试试这个：

SELECT c.PSScnID, c.PSEmpID, c.Prd, c.WBSID, c.RatePrd, SUM(c.Hours) AS Hours
INTO dbo.NewPS_StaffHours 
FROM PS_StaffHours AS c  
GROUP BY c.PSScnID, c.PSEmpID, c.Prd, c.WBSID, c.RatePrd  
GO

听起来您将在运行您的 select 之前创建您的 table。所以去掉 INTO dbo.NewPS_StaffHours。运行创建 table 语句然后 INSERT INTO newTable VALUES... SELECT

从现有 table 创建新的 SQL 服务器 table

Creating a new SQL Server table from an existing table

sql

sql-server

group-by

migrate