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MySQL - Update Query - Tutorialspoint

MySQL – Update Query – Tutorialspoint

There may be a requirement that existing data in a MySQL table must be modified. You can do this by using the SQL UPDATE command. This will modify any field value of any MySQL table.


The following code block has a generic SQL syntax of the UPDATE command to modify the data in the

MySQL table: UPDATE table_name SET field1 = new-value1, field2 = new-value2 [WHERE clause] You can update

  • one or more fields completely
  • . You can

  • specify any condition by using the WHERE clause
  • .

  • You can update values for only one table at a time.

The WHERE clause

is very useful when you want

to update selected rows in a table. Updating data from the command


This will use the SQL UPDATE command with the WHERE clause to update the selected data in the MySQL table tutorials_tbl



The following example will update the tutorial_title field for a record that has the tutorial_id as 3.

root@host# password mysql -u root -p; Enter password:******* mysql> use TUTORIALS; Changed database mysql> UPDATE tutorials_tbl -> SET tutorial_title = ‘Learning JAVA’ -> WHERE tutorial_id = 3; Query successful, 1 row affected (0.04 sec) Matching rows: 1 Changed: 1 Warnings: 0 mysql>

Refreshing data using a PHP script PHP uses the

mysqli query() or mysql_query() function to update records in a MySQL table. This function takes two parameters and returns TRUE in case of success or FALSE in case of error.


$mysqli->query($sql,$resultmode) Sr.No. Parameter and Description 1


Required – SQL query to update records in a MySQL table

. 2


Optional – Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used.


Try the following example

to update a record in a table

Copy and paste the following example as mysql_example.php −

<html> <head> <title>Updating MySQL Table</title> </head> <body> <?php $dbhost = ‘localhost’; $dbuser = ‘root’; $dbpass = ‘root@123’; $dbname = ‘TUTORIALS’; $mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname); if($mysqli->connect_errno ) { printf(“Connection error: %s<br />”, $mysqli->connect_error); exit(); } printf(‘Successfully connected.<br />’); if ($mysqli->query(‘UPDATE tutorials_tbl set tutorial_title = “Learning Java” where tutorial_id = 4’)) { printf(“Table tutorials_tbl updated successfully.<br />”); } if ($mysqli->errno) { printf(“Could not update table: %s<br />”, $mysqli->error); } $sql = “SELECT tutorial_id, tutorial_title, tutorial_author, submission_date FROM tutorials_tbl”; $result = $mysqli->query($sql); if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { printf(“Id: %s, Title: %s, Author: %s, Date: %d <br />”, $row[“tutorial_id”], $row[“tutorial_title”], $row[“tutorial_author”], $row[“submission_date”]); } } else { printf(‘No record found.<br />’); } mysqli_free_result($result); $mysqli->close(); ?> </body> </html>


Access the deployed mysql_example.php on the Apache web server and verify the output. Here we have entered several records in the table before running the select script.

Connected successfully. The table tutorials_tbl updated successfully. Id: 1, Title: MySQL Tutorial, Author: Mahesh, Date: 2021 Id: 2, Title: HTML Tutorial, Author: Mahesh, Date: 2021 Id: 3, Title: PHP Tutorial, Author: Mahesh, Date: 2021 Id: 4, Title: Learning Java, Author: Mahesh, Date: 2021 Id: 5, Title: Apache Tutorial, Author: Suresh, Date: 2021

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