![]() Also, the CASE statement cannot have an ELSE NULL clause (the CASE operator can), and it is terminated with END CASE instead of END (which is how the CASE operator is terminated). SELECT (case when column1'A' then (select value from Table1) when column1'B' then (select value from Table2) when column1'C' then (select value from Table3) and so on uptil 35 more 'when' conditions. The CASE statement is specifically for use in stored programs. ![]() It extracts all category records where the category name contains. The CASE OperatorĪs mentioned, in MySQL there’s a difference between the CASE statement and the CASE operator. The following query is case-sensitive search against a column by using BINARY operator. While memorizing them is impossible, knowing essential. See the MySQL CASE operator for an example of how the second syntax (the searched CASE expression) works. Currently, as of MySql 8, there are more than 700 reserved keywords, each with its unique function. Now when we call that procedure, the output depends on our input: CALL sp_lunch( 'Thai', ) Īnd with different input: CALL sp_lunch( 'Italian', ) Īnd when we input a value that’s not covered by any of the WHEN conditions, the ELSE clause is effected: CALL sp_lunch( 'Aussie', ) The simple CASE expression compares an expression to a set of simple expressions to determine the result. This syntax is referred to as the simple CASE expression. What Is a CASE Statement To put it very simply, it’s an SQL statement that goes through and returns values according to the conditions specified. Here’s an example of a basic stored procedure with the first CASE syntax: DELIMITER | this means: return success1 (which can be TRUE or FALSE) in case id<800, or always return TRUE otherwise. ![]() WHEN search_condition THEN statement_list Subproducts are indicated by having an entry in the HIGHERCATALOGID column, while for products the HIGHERCATALOGID column is NULL. The CASE statement can be used in two ways. 1 I have a PRODUCTS table which contains product records or subproducts records. Also, there’s a slight difference in the syntax. The CASE statement is different to the CASE operator, in that the CASE statement is specifically for use in stored programs. MySQL CASE Statement in SELECT Ask Question Asked 9 years, 7 months ago Modified 7 years, 2 months ago Viewed 8k times 0 I have a MySQL query question. It compares a list of conditions and returns a different result depending on which condition (if any) is matched. The CASE statement goes through conditions and return a value when the first condition is met (like an IF-THEN-ELSE statement). This MySQL tutorial explains how to use the MySQL CASE function with syntax and examples. In MySQL, the CASE statement can be used in stored programs to perform a complex conditional construct.
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