Structured Query Language tutorial ( update record )

Update : 

The UPDATE statement is used to update existing records in a table.

SQL UPDATE Syntax

UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value

Note: Notice the WHERE clause in the UPDATE syntax. The WHERE clause specifies which record or records that should be updated. If you omit the WHERE clause, all records will be updated!

SQL UPDATE Example

The "Persons" table:

P_Id LastName FirstName Address City
1      Hansen Ola Timoteivn 10 Sandnes
2      Svendson Tove Borgvn 23 Sandnes
3 Pettersen  Kari Storgt 20 Stavanger
4 Nilsen Johan Bakken 2 Stavanger
5 Tjessem Jakob  

Now we want to update the person "Tjessem, Jakob" in the "Persons" table.

We use the following SQL statement:

UPDATE Persons
SET Address='Nissestien 67', City='Sandnes'
WHERE LastName='Tjessem' AND FirstName='Jakob'

The "Persons" table will now look like this:

P_Id    LastName FirstName   Address City
1 Hansen Ola Timoteivn 10 Sandnes
2 Svendson Tove        Borgvn 23 Sandnes
3 Pettersen Kari Storgt 20    Stavanger
4 Nilsen Johan Bakken 2     Stavanger
5 Tjessem Jakob Nissestien 67 Sandnes
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