![]() Follow C# Corner to learn more new and amazing things about MySQL. In this article, I have discussed the concept of CASE Expressions in MySQL with various examples. WHEN "In Progress" THEN "Product_Not_Shipped" END AS ProductStatus With Aggregate Function SELECT SUM(CASE WHEN Status = 'Done'ĭifference between SIMPLE and SEARCHED CASE ExpressionsĮxample 1 SELECT CASE WHEN 10 * 2 = 20 THEN '20 correct' ![]() ![]() In this tutorial, you will learn about the SQL CASE. But, if any value is not satisfied by the corresponding conditions then, it returns the “result_value” that is specified in the ELSE clause.Įxample 1 SELECT CASE WHEN 10 * 2 = 25 THEN 'Incorrect'Įxample 2 SELECT CASE WHEN 5 * 5 - 5 / 5 + 6 = 30 THEN "TRUE"Įxample 3 SELECT CASE WHEN 10 * 2 = 20 THEN '20 correct'Įxample 5. The SQL CASE statement is used to check conditions and perform tasks on each row while selecting data. Compare the expression with multiple possible values, and return the corresponding results when matching. In the Searched Case Expressions, CASE evaluates the “expressions” values that are specified in the WHEN clause and returns the corresponding “result_set” value. With Aggregate Function SELECT SUM(CASE Status WHEN 'Done' But, if the “case_value” does not match with any “value,” then it returns the “result_value”.Įxample 1 SELECT CASE 10 * 2 WHEN 25 THEN 'Incorrect'Įxample 2 SELECT CASE 5 * 5 - 5 / 5 + 6 WHEN 30 THEN "TRUE"Įxample 5. In the Simple Case Expressions, when “case_value” matches with its respective “value”, then it returns the corresponding “result” value. Here, I am providing the database with the tables containing the records, on which I am showing you various examples. MySQL CASE Statements are only used in Stored Procedures, Functions, Events, and Triggers, whereas MySQL CASE Expressions are used in SELECT Queries.įirst, let's create a database with a few tables containing some dummy data. Note that MySQL CASE Expressions are different from MySQL CASE Statements. You can use the CASE expression anywhere in a query, like SELECT, WHERE, or ORDER BY clause. If we have to use it in a numeric context, the result is returned as a decimal, real, or integer value. An expression is the compatible aggregated type of all return values but also depends on the context. The CASE expression evaluates its conditions sequentially and stops with the first condition whose. For a list of control-of-flow methods, see Control-of-Flow Language (Transact-SQL). In MySQL, the case expression shows multiple conditions. The CASE expression can't be used to control the flow of execution of Transact-SQL statements, statement blocks, user-defined functions, and stored procedures. Therefore, observe how the syntax of the CASE construct starts with the keyword CASE. Difference between SIMPLE and SEARCHED CASE Expressions So, MySQL is a rich language and there are many ways a condition can be.This article will cover the following topics. In this tutorial, I am going to explain CASE expressions in MySQL with examples. In MySQL, the CASE statement has the functionality of an IF-THEN-ELSE statement and has 2 syntaxes that we will explore.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |