What is the purpose of declaring in SQL?

The DECLARE statement is used to declare a local variable in a stored procedure. Its purpose is to specify the variable’s name and data type, and it can also assign an initial value to the variable. Within a stored procedure, multiple different local variables can be declared using the DECLARE statement, and these variables are only valid within the scope of the stored procedure. After declaring a variable, the SET statement can be used to assign a value to the variable, which can then be used in the stored procedure for calculations, queries, and other operations.