UPDATE Statement
The SQL UPDATE Statement
The UPDATE statement is used to modify the existing records in a table.
UPDATE Syntax
Note: Be careful when updating records in a table! Notice the WHERE clause in the UPDATE statement. The WHERE clause specifies which record(s) that should be updated. If you omit the WHERE clause, all records in the table will be updated!
Demo Database
Below is a selection from the "Customers" table :
UPDATE Table
The following SQL statement updates the first customer (CustomerID = 1) with a new contact person and a new city.
Example
The selection from the "Customers" table will now look like this:
UPDATE Multiple Records
It is the WHERE clause that determines how many records that will be updated.
The following SQL statement will update the contactname to "Juan" for all records where country is "Mexico":
Example
The selection from the "Customers" table will now look like this:
Update Warning!
Be careful when updating records. If you omit the WHERE clause, ALL records will be updated!
Example
The selection from the "Customers" table will now look like this:
Last updated