Search results for: "SELECT query"

What is the difference between using SELECT * and SELECT COUNT(*) in a MySQL query in PHP?

When using SELECT *, the query will return all columns of the selected rows from the database. On the other hand, when using SELECT COUNT(*), the quer...

What is the difference between using "SELECT modul" and "SELECT *" in a MySQL query in PHP?

When using "SELECT modul" in a MySQL query in PHP, you are specifying a specific column (modul) to retrieve data from. This can be beneficial if you o...

Why is it important to specify the columns in a SELECT query instead of using SELECT *?

Specifying the columns in a SELECT query is important because it allows you to retrieve only the necessary data from the database, improving query per...

What are the potential issues with executing a SELECT query before an INSERT query in PHP?

Executing a SELECT query before an INSERT query in PHP can lead to potential race conditions where two processes try to insert the same data simultane...

Is using a SELECT COUNT(*) query more efficient than a SELECT * query for checking if a username is already registered in PHP?

Using a SELECT COUNT(*) query is more efficient than a SELECT * query for checking if a username is already registered in PHP because it only retrieve...