Search results for: "UNIQUE KEY"

What is the significance of the primary key and auto_increment in PHP when dealing with database entries?

The primary key in a database table uniquely identifies each row, ensuring that no two rows have the same key. Auto_increment is a feature that automa...

What is the significance of defining a primary key as AUTOINCREMENT in a MySQL database table?

Defining a primary key as AUTOINCREMENT in a MySQL database table allows the database to automatically generate a unique value for the primary key whe...

How can auto-increment be used in PHP to generate unique IDs for database entries?

Auto-increment can be used in PHP to generate unique IDs for database entries by setting the primary key of the table to auto-increment. This way, eac...

What does the error message "Duplicate entry '127' for key 1" in PHP indicate?

The error message "Duplicate entry '127' for key 1" in PHP indicates that you are trying to insert a record into a database table with a primary key v...

What is the correct syntax for defining an auto-increment primary key in a MySQL table using PHP?

When defining an auto-increment primary key in a MySQL table using PHP, you need to include the "AUTO_INCREMENT" attribute in the column definition fo...