Syntax of Update SQL Query.
he SQL UPDATE Statement
The UPDATE statement is used to modify the existing records in a table.
SET column1 = value1, column2 = value2, …
The following SQL statement updates the first customer (CustomerID = 1) with a new contact person and a new city.
SET ContactName = ‘Alfred Schmidt’, City= ‘Frankfurt’
WHERE CustomerID = 1;
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”: