Sql procedures

content/sql/concepts/procedures/procedures.md

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+---
+Title: 'Procedures'
+Description: 'Procedures are blocks of SQL code that are saved in a database and can be executed repeatedly on demand.'
+Subjects:
+  - 'Data Science'
+Tags:
+  - 'Database'
+  - 'MySQL'
+CatalogContent:
+  - 'learn-sql'
+  - 'paths/analyze-data-with-sql'
+---
+
+Procedures are blocks of SQL code that are saved in a database and can be executed repeatedly on demand. Also referred to as stored procedures — they can be defined with parameters to be used within the body of the procedure, produce an output value, or both.
+
+The syntax for creating a procedure varies depending upon the type of database management system (DBMS) being used. Below is an example procedure defined and executed with [MySQL](https://www.mysql.com/) that accepts two parameters and returns an output value.
+
+## MySQL Example
+
+```sql
+# Set the default delimiter so the procedure can include semicolons
+DELIMITER //
+
+# Create the procedure
+CREATE PROCEDURE add_int (IN x INT, IN y INT, OUT z INT)
+BEGIN
+  SELECT x + y INTO z;
+END //
+
+# Set the delimiter back to the default
+DELIMITER ;
+
+# Execute the stored procedure
+CALL add_int (5, 3, @z);
+# Return the output parameter
+SELECT @z AS Result;
+```
+
+Output:
+
+| Result |
+| ------ |
+| 8      |