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This article is about the differences between stored procedures and functions. The editor thought it was very practical, so I shared it with you as a reference. Let's follow the editor and have a look.

Stored procedures and functions are different: 1, stored procedures are precompiled collections of SQL statements and optional control flow statements, while functions are subroutines composed of one or more SQL statements; 2, stored procedures can execute a series of SQL statements in a single stored procedure, while custom functions have many limitations; 3, execution methods are different.

The difference between stored procedures and functions

First, the meaning is different

1. Stored procedure: a stored procedure is a precompiled collection of SQL statements and optional control flow statements, stored in a name and processed as a unit.

2. Function: a subroutine consisting of one or more SQL statements that can be used to encapsulate code for reuse. There are many restrictions on functions, such as cannot use temporary tables, can only use table variables, and so on.

Second, different conditions of use

1. Stored procedure: you can execute a series of SQL statements in a single stored procedure. And you can reference other stored procedures from within your own stored procedures, which can simplify a series of complex statements.

2, function: custom function has many restrictions, many statements can not be used, and many functions can not be realized. The function can directly reference the return value and return the recordset with table variables. However, user-defined functions cannot be used to perform a set of operations that modify the state of the global database.

Third, different ways of implementation

1. Stored procedures: stored procedures can return parameters, such as recordsets, and functions can only return values or table objects. There are three in,out,inout parameters for stored procedures, and no return type is required when the stored procedure is declared.

2, function: the function argument only in, and the function needs to describe the return type, and the function must contain a valid return statement.

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