What are the differences between mysql_db_query and mysql_query functions in PHP?

The main difference between mysql_db_query and mysql_query functions in PHP is that mysql_db_query requires an additional parameter for the database name, while mysql_query does not. It is recommended to use mysql_query as mysql_db_query is deprecated in newer versions of PHP. 

```php
// Using mysql_query function
$conn = mysql_connect("localhost", "username", "password");
mysql_select_db("database_name", $conn);
$result = mysql_query("SELECT * FROM table_name", $conn);
```
Note: It is recommended to use mysqli or PDO for database operations instead of the deprecated mysql functions.

Keywords

mysql_db_query mysql_query PHP differences database

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