How-to articles, tricks, and solutions about MYSQL

In this tutorial, we are going to represent to you two handy options of how to check if a record exists in the database with PHP.

If you wonder how to find a proper way of converting MySQL data to JSON format using PHP, then you are in the right place. Read on and check the example.

In Yii2, you can use the count() and groupBy() methods in the query builder to count and group the results of a query, respectively.

To create a foreign key in PHPMyAdmin, follow these steps:

To create a virtual column using a MySQL SELECT statement, you can use the AS keyword to assign a name to an expression in the SELECT statement.

You can use the date() function in PHP to display a date in ISO 8601 format.

To get the ID of the last inserted row, you can use the LAST_INSERT_ID() function.

To get the primary key of a table in PHP, you can use the SHOW KEYS SQL statement to retrieve information about the keys (including the primary key) of a table.

To include a PHP variable inside a MySQL statement, you need to use prepared statements with bound parameters.

In Zend Framework, you can use the Zend_Db_Select object's __toString() method to print the exact SQL query that will be executed.

To set up a PDO connection, you will need to do the following:

When retrieving results in PHP and encountering ambiguous column names, you can use table aliases to specify which table the column belongs to.

You can use the DATE() and TIME() functions to extract the date and time parts of a DATETIME value in MySQL.

To store the file name in a database along with other information while uploading an image to a server using PHP, you can follow these steps:

Using multiple databases in Laravel is quite easy.

In PHP with PDO, you can use the debugDumpParams() method on a prepared statement object to view the final SQL parametrized query.

To increment a value in a MySQL update query using PHP, you can use the += operator.

To insert data into multiple tables using one form in PHP, you can use a single SQL statement with multiple INSERT INTO clauses, or you can use multiple individual SQL statements, one for each table.

To install a specific version of a package with pip, you can use the pip install command followed by the package name and the desired version number.

It is possible to invoke a PHP script from a MySQL trigger by using the system() function in the trigger's body.

A java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES) error typically indicates that the MySQL server is unable to authenticate the user with the provided username and password.

In Laravel, you can use the Query Builder to delete records from a database table.

In Laravel, you can use the leftJoin method on a query builder instance to perform a left join, and then use the whereNull method to only include records where a column from the right-hand table is null:

If you have an existing table in your database that you want to add new columns to using a Laravel migration, you can use the Schema::table method to modify the existing table.

To get a single value from a MySQL query in Laravel, you can use the value method on a query builder instance.