Creating a new SQL Server table from an existing table - sql

Question

I have the job of updating a database table by removing the month column and recreating that table grouping on column fields and summing the hours column.
Here are my instructions: "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."
Now here is the table I scripted out and have to re-create without the Month column and summing the hour column:
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
First, to create the new table I think all I have to do is rename the table name in the CREATE portion of the script and just remove all references of the Month column in the CREATE statement. Am I correct in my thinking about the CREATE script?
Now, here is the script I'm going to use to populate the table without the Month field but I'm not sure if I have the grouping correct because I am getting an error because I'm not grouping on the Hours column with the rest. Also, I'm unsure about how to go about summing the hours in the query.
My code:
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

Your first assumption is correct.
To group by your columns and sum up the hours - try this:
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
Sounds like you're going to be creating your table before running your select.
So get rid of the INTO dbo.NewPS_StaffHours. Run a create table statement and then and INSERT INTO newTable VALUES... SELECT