How to write a sql function
The main difference between procedure and a function is, a function must always return a value, and on the other hand a procedure may or may not return a value. Let's take a customer table. This example illustrates creating and calling a standalone function. While creating a function, you have to give a definition of what the function has to do. To use a function, you will have to call that function to perform the defined task. Once the function is called, the program control is transferred to the called function.
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MySQL Stored Function
SQL Stored Procedures
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it. You can also pass parameters to a stored procedure, so that the stored procedure can act based on the parameter value s that is passed. The following SQL statement creates a stored procedure named "SelectAllCustomers" that selects all records from the "Customers" table:. The following SQL statement creates a stored procedure that selects Customers from a particular City from the "Customers" table:. Setting up multiple parameters is very easy. Just list each parameter and the data type separated by a comma as shown below.
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How to create a simple MySQL function?
This reference contains string, numeric, date, and some advanced functions in MySQL. Get certified by completing a course today! If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:.
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