User-Defined Variables
The @ sign precedes user-defined variables in MySQL, which may be set and retrieved at any time throughout a session. They are commonly used to temporarily store values and transfer them across queries.
Process:
- Set a user-defined variable with the SET command.
- Access the variable in subsequent queries in the same session.
— Setting a User-Defined Variable
SET @user_var = 100;
— Accessing the User-Defined Variable
SELECT @user_var;
User Defined Variables vs Local Variables in MySQL
In MySQL, both user-defined and local variables are important for storing temporary data during SQL query execution. Understanding the distinctions and applications of each type is critical for effective query execution and attaining the appropriate results.
This article delves into the differences between user-defined variables and local variables in MySQL, offering insights into their use and instances in which one may be favored over the other.