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SQL Server FAQ - Updating Values with UPDATE Statements

By: FYIcenter.com

(Continued from previous topic...)

How To Update Values in a Table with UPDATE Statements?

If you want to update some values in one row or multiple rows in a table, you can use the UPDATE statement. The tutorial script below shows a good example:

SELECT * FROM fyi_links WHERE id = 101
GO
id      url                     notes   counts  created
101     dev.fyicenter.com       NULL    0       2006-04-30

UPDATE fyi_links SET counts = 999, notes = 'Good.' 
   WHERE id = 101;
GO
(1 row(s) affected)

SELECT * FROM fyi_links WHERE id = 101
GO
id      url                     notes   counts  created
101     dev.fyicenter.com       Good.   999     2006-04-30

As you can see, the SET clause takes column and value pairs to provide new values, while the WHERE clause defines which row to apply the update.

(Continued on next topic...)

1. What Are DML (Data Manipulation Language) Statements?
2. How To Create a Testing Table with Test Data?
3. How To Insert a New Row into a Table with "INSERT INTO" Statements?
4. How To Use Column Default Values in INSERT Statements?
5. How to provide column names in INSERT Statements?
6. What Happens If You Insert a Duplicate Key for the Primary Key Column?
7. How To Insert Multiple Rows with One INSERT Statement?
8. How To Update Values in a Table with UPDATE Statements?
9. How To Update Multiple Rows with One UPDATE Statement?
10. How to use old values to define new values in UPDATE statements?
11. Is the Order of Columns in the SET Clause Important?
12. How To Use Values from Other Tables in UPDATE Statements?
13. What Happens If the UPDATE Subquery Returns No Rows?
14. What Happens If the UPDATE Subquery Returns Multiple Rows?
15. How To Delete an Existing Row with DELETE Statements?
16. How To Delete Multiple Rows with One DELETE Statement?
17. How To Delete All Rows with DELETE Statements?
18. How To Delete All Rows with TRUNCATE TABLE Statement?