update a table based on a query of itself

Good Afternoon Experts,

I have a table that is storing a name column as a full name and I want to split it up as first name and last name.  The data is pretty clean, one space between first and last name in each case, no initals etc so I can do a select to seperate the data for example :

SELECT
  SUBSTRING(Loan_Officer, 1, CHARINDEX(' ', Loan_Officer) - 1) AS LO_First_Name,
  SUBSTRING(Loan_Officer, CHARINDEX(' ', Loan_Officer) + 1, 8000) AS LO_Last_Name
FROM
  Custom_LO_Commission

but how do I then take that data and update Custom_LO_Commission table
to insert the two new columns LO_FirstName and LO_LastName with the correct data per record?
ISBTECHAsked:
Who is Participating?
 
deviprasadgCommented:
Add computed firstname and lastname columns to the table.

ALTER TABLE  Custom_LO_Commission ADD firstname AS SUBSTRING(Loan_Officer, 1, CHARINDEX(' ', Loan_Officer) - 1)
ALTER TABLE  Custom_LO_Commission ADD lastname AS SUBSTRING(Loan_Officer, CHARINDEX(' ', Loan_Officer) + 1, 8000)

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0
 
Kent OlsenData Warehouse Architect / DBACommented:
Actually, you've already done the hard work.  :)


UPDATE mytable
SET (firstname, lastname) =
  (SUBSTRING(Loan_Officer, 1, CHARINDEX(' ', Loan_Officer) - 1),
  SUBSTRING(Loan_Officer, CHARINDEX(' ', Loan_Officer) + 1, 8000))
FROM
  Custom_LO_Commission


Good Luck,
Kent
0
 
ISBTECHAuthor Commented:
That gives me
Incorrect syntax near '('.
0
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lcohanDatabase AnalystCommented:
You could do that in a AFTER INSERT/UPDATE trigger however my recommandations are to do it in the code that populates the table instead.

You need to put that trigger on the parent table where the INSERT or UPDATE takes place and the code will be something like:

CREATE TRIGGER [dbo].[Trigger_Custom_LO_Commission]
    ON [dbo].Custom_LO_Commission
    AFTER INSERT,UPDATE
AS
BEGIN
SET NOCOUNT ON

UPDATE Custom_LO_Commission
SET LO_First_Name = SUBSTRING(Loan_Officer, 1, CHARINDEX(' ', Loan_Officer) - 1),
      LO_Last_Name  = SUBSTRING(Loan_Officer, CHARINDEX(' ', Loan_Officer) + 1, 8000)
FROM
  Custom_LO_Commission
WHERE Id = (SELECT Id FROM INSERTED)

END;


--where ID from "WHERE Id = (SELECT Id FROM INSERTED)" is the ROW identifier for that Loan_Officer fullname.
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appariCommented:
try this

UPDATE Custom_LO_Commission
SET firstname =    SUBSTRING(Loan_Officer, 1, CHARINDEX(' ', Loan_Officer) - 1) ,
 lastname = SUBSTRING(Loan_Officer, CHARINDEX(' ', Loan_Officer) + 1, 8000)
0
 
ISBTECHAuthor Commented:
That did it and added the new columns all in one statement, Nice!

Thanks!
0
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