Create Functions

This part of the tutorial shows how to create functions that are used to develop the stored procedures. This tutorial uses user-defined functions (UDFs). For related information, refer to CREATE FUNCTION (UDF).

Note

The SQL Editor only runs the queries that you select, so ensure you have them all selected before selecting Run.

Run the following SQL commands to create the user-defined functions (UDFs):

SQL

USE trades;

DELIMITER //

CREATE OR REPLACE FUNCTION marketcap_to_DECIMAL(s varchar(15) CHARACTER SET utf8 COLLATE utf8_general_ci NULL) RETURNS decimal(18,2) NULL AS
   DECLARE
     m CHAR(1) = SUBSTR(s, LENGTH(s), 1);
     raw_v DECIMAL(18,2) = SUBSTR(s, 2, LENGTH(s) - 1);
     v DECIMAL(18,2) = NULL;
   BEGIN
       IF m = "B" THEN
         v = raw_v * 1000;
       ELSE
         v = raw_v;
       END IF;
     RETURN v;
   END //

DELIMITER ;

Create Functions

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