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This value is compared to the when_value expression in each WHEN clause until one of them is equal. This MySQL tutorial explains how to use the MySQL CASE function with syntax and examples. The MySQL CASE function has the functionality of an IF-THEN-ELSE statement by allowing you to evaluate conditions and return a value when the first condition is met. The CASE statement cannot have an ELSE NULL clause, and it is terminated with END CASE instead of END. Example: MySQL CASE operator. In the following statement, CASE is 1, therefore "this is case one" is returned.

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The syntax for the CASE function in MySQL is: CASE [ expression ] WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 WHEN condition_n THEN result_n ELSE result END Parameters or Arguments expression Optional. It is the value that you are comparing to the list of conditions. (ie: condition_1, condition_2, condition_n) Besides the IF statement, MySQL provides an alternative conditional statement called the CASE statement for constructing conditional statements in stored procedures. The CASE statements make the code more readable and efficient. The CASE statement has two forms: simpleCASE and searched CASE … MySQL CASE is a MySQL Statement query keyword that defines the way to handle the loop concepts to execute the set of conditions and return the match case using IF ELSE.

There are two variants of CASE, and you're not using the one that you think you are. What you're doing CASE case_value WHEN when_value THEN statement_list [WHEN when_value THEN statement_list] [ELSE statement_list] END CASE Each condition is loosely equivalent to a if (case_value == when_value) (pseudo-code).

The IF statement implements a basic conditional construct within a stored programs and must be terminated with a semicolon. In this tutorial we will learn about CASE statement in MySQL. The CASE statement. We use the CASE statement to check if a given expression satisfies some given condition.

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Press CTRL+C to copy.

Here we discuss the Introduction of MySQL CASE Statement and the practical examples and different subquery expressions. 22 Aug 2019 The MySQL CASE statement is faster in comparison to PHP if statement. The PHP if statement takes too much time because it loads data and  The SQL CASE Statement. MySQL tries to extract range conditions from the WHERE clause for each of the possible indexes. In MySQL, this is not guaranteed.
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Converts value to DECIMAL. Use the optional M and D parameters to specify the maximum number of digits (M) and the number of digits following the decimal point (D). Converts value to TIME.
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What you're doing CASE case_value WHEN when_value THEN statement_list [WHEN when_value THEN statement_list] [ELSE statement_list] END CASE Each condition is loosely equivalent to a if (case_value == when_value) (pseudo-code). 13.6.5.1 CASE 構文. Press CTRL+C to copy. CASE case_value WHEN when_value THEN statement_list [WHEN when_value THEN statement_list] [ELSE statement_list] END CASE. または: Press CTRL+C to copy.