![]() Now we can see the result below when we call this procedure:ĬASE 1: CALL checkProduct('Chocolate', +-+ SET Category = 'Product does not exist!' SET Category = 'This product belongs to Food category' The following query will create a procedure named “checkProduct” which contains the IF-ELSE statements: DELIMITER $ĬREATE PROCEDURE checkProduct(IN Prod Varchar(20), OUT Category varchar(50)) To show the use of the IF statement in a MySQL stored procedure, we create the following stored procedure, based on the values from the table named ‘Stock’, as shown below: > SELECT * FROM Stock In this tutorial, we are going to see the IF statement not the IF() function. Opinions are my own.In this tutorial, we are going to see how to use the IF-THEN condition in MySQL to execute a block of SQL code based on a specified condition. Use those practices that best benefit your needs and goals. Your particular goals and needs may vary. The majority, if not all, of the examples provided are performed on a personal development/learning workstation-environment and should not be considered production quality or ready. They are not the utmost best solution(s). Among those, he shares a love of tabletop RPG games, reading fantasy novels, and spending time with his wife and two daughters.ĭisclaimer: The examples presented in this post are hypothetical ideas of how to achieve similar types of results. Other favorite activities find him with his nose buried in a good book, article, or the Linux command line. Josh Otwell has a passion to study and grow as a SQL Developer and blogger. To receive email notifications (Never spam) from this blog (“ Digital Owl’s Prose”) for the latest blog posts as they are published, please subscribe (of your own volition) by clicking the ‘Click To Subscribe!’ button in the sidebar on the homepage! (Feel free at any time to review the Digital Owl’s Prose Privacy Policy Page for any questions you may have about: email updates, opt-in, opt-out, contact forms, etc…)īe sure and visit the “Best Of” page for a collection of my best blog posts. Have I mentioned how much I love a cup of coffee?!?! Visit the Portfolio-Projects page to see blog post/technical writing I have completed for clients. ![]() Please share your findings here, with someone else you know who would get the same value out of it as well. I truly hope you discovered something interesting and enlightening. Thank you for taking the time to read this post. Please share your thoughts below in the comments. I’d love to hear different takes on the procedure I have included in this blog post, along with other uses you can think of. Help me learn more about MySQL Stored Procedures. There is more than one way to skin a cat, so they say. NULL is returned since 0.111 is not a present value in the wall_thickness table. Guess we better get to typing that 3 table JOIN query… Again… That works just fine, but a request has just come to us for wall thickness value 0.721 as well. mysql> SELECT p.pipe_name, p.pipe_length -> FROM pipe AS p -> INNER JOIN pw_wall_thickness AS pw -> ON p.pipe_id = pw.pw_pipe_id -> INNER JOIN wall_thickness AS wt -> ON pw.pw_thickness_id = wt.w_thickness_id -> WHERE wt.wall_thickness_amount = 0.393 -> ORDER BY p.pipe_length ASC -> LIMIT 1 + - + -+ | pipe_name | pipe_length | + - + -+ | Joint-9844 | 10.40 | + - + -+ 1 row in set (0.00 sec) Suppose we run a query similar to this one, daily, determining the shortest piece of pipe for a given wall_thickness_amount. Table wall_thickness is of high interest, since it holds wall thickness values.
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