函数：
它是计算机程序设计的基本思想之一。它用于根据给定的输入计算某些内容。因此它的名字来自数学。函数可以是用户定义的或预定义的。函数程序具有执行某些特定任务或功能的代码块。
程序：
在编程一组特定的指令或命令时称为过程。依靠编程语言，它被称为过程、子例程、函数或子程序。
函数和过程的区别：
| S.NO | Function | Procedure |
|---|---|---|
| 1. | A function deals with as an expression. | Whereas a procedure does not deal with as an expression. |
| 2. | Function is used to calculate something from a given input. Hence it got its name from Mathematics. | While procedure is the set of commands, which are executed in a order. |
| 3. | The function can be called by a procedure. | But a procedure can not be called by a function. |
| 4. | In sql, inside the function we can not use the DML(Data manipulation language) commands such as Insert, Delete, Update. | Here, in sql, inside the procedure we can use DML commands. |
| 5. | Functions can be called through sql queries. | However, the procedure can’t be called through a sql query. |
| 6. | Each time functions are compiled when they are called. | Whereas, procedures are compiled only once and can be called again and again as needed without being compiled each time. |
| 7. | The return statement of a function returns the control and function’s result value to the calling program. | While the return statement of the procedure returns control to the calling program, it can not return the result value. |
| 8. | Function doesn’t support try-catch blocks. | While it supports try-catch blocks. |
| 9. | Function can be operated in the SELECT statement. | While it can’t be operated in the SELECT statement. |
| 10. | Function does not support explicit transaction handles. | While procedure supports explicit transaction handles. |