The UPDATE statement is used to modify the existing records in a table.
UPDATE Syntax
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;Demo Database
Below is a selection from the "Customers" table in the Northwind sample database:
| CustomerID | CustomerName | City | PostalCode | Country | ||
|---|---|---|---|---|---|---|
| 1 | Jamdhade Tushar | Pune | 12209 | India | ||
| 2 | Jamdhade Atharv | Newasa | 05021 | India | ||
| 3 | Jamdhade Gaurav | MP | 05023 | India | ||
| 4 | Jamdhade Sagar | UP | WA1 1DP | India | ||
| 5 | Jamdhade Tush | Newasa | S-958 22 | India |
UPDATE Table
The following SQL statement updates the first customer (CustomerID = 1) with a new contact person and a new city.
Example
UPDATE Customers
SET CustomerName = 'Tush ', City= 'Newasa'
WHERE CustomerID = 1;The selection from the "Customers" table will now look like this:
| CustomerID | CustomerName | City | PostalCode | Country | ||
|---|---|---|---|---|---|---|
| 1 | Tush | Newasa | 12209 | India | ||
| 2 | Jamdhade Atharv | Newasa | 05021 | India | ||
| 3 | Jamdhade Gaurav | MP | 05023 | India | ||
| 4 | Jamdhade Sagar | UP | WA1 1DP | India | ||
| 5 | Jamdhade Tush | Newasa | S-958 22 | India |
UPDATE Multiple Records
It is the WHERE clause that determines how many records will be updated.
The following SQL statement will update the ContactName to "Juan" for all records where country is "Mexico":
Example
UPDATE Customers
SET ContactName='Juan'
WHERE Country='Mexico';