What is the difference between procedural SQL and C language in defining variables

Process SQL In the definition of variables, it is similar to C What is the difference between the definition of variables in language ？

Can you talk about process SQL Is it different from the program block of high-level language ？（ From the definition of variables 、 Setting of variable value 、 Definition of program block 、 The loop body 、 Condition judgment and other aspects are discussed ）

What are the advantages of stored procedures ？ Please use stored procedures to complete the application scenario of students' course selection . Input parameter is ： The student's name , Course name . requirement ： The prerequisite course of introduction to database system is programming language , That is, before students take the course of introduction to database system , You must get credits for programming courses