MySQL Update Query

There may be a requirement where existing data in a MySQL table need to be modified. You can do so by using SQL UPDATE command. This will modify any field value of any MySQL table.
Syntax:

Here is generic SQL syntax of UPDATE command to modify data into MySQL table:
UPDATE table_name SET field1=new-value1, field2=new-value2
[WHERE Clause]

You can update one or more field all together.

You can specify any condition using WHERE clause.

You can update values in a single table at a time.

The WHERE clause is very useful when you want to update selected rows in a table.
Updating Data from Command Prompt:

This will use SQL UPDATE command with WHERE clause to update selected data into MySQL table tutorials_tbl
Example:

Following example will update tutorial_title field for a record having tutorial_id as 3.
root@host# mysql -u root -p password;
Enter password:*******
mysql> use TUTORIALS;
Database changed
mysql> UPDATE tutorials_tbl
-> SET tutorial_title='Learning JAVA'
-> WHERE tutorial_id=3;
Query OK, 1 row affected (0.04 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql>
Updating Data Using PHP Script:

You can use SQL UPDATE command with or without WHERE CLAUSE into PHP function mysql_query(). This function will execute SQL command in similar way it is executed at mysql> prompt.
Example:

Try out following example to update tutorial_title field for a record having tutorial_id as 3.
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
$sql = 'UPDATE tutorials_tbl
SET tutorial_title="Learning JAVA"
WHERE tutorial_id=3';

mysql_select_db('TUTORIALS');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
die('Could not update data: ' . mysql_error());
}
echo "Updated data successfully\n";
mysql_close($conn);
?>