10/31/2023 0 Comments Mysql case elseSELECT Beer.Beer, Beer.Brewery, Beer.Style, Beer.ABV, Beer.Hops, Beer.SRM, Sum(BeerStock.Quantity) totalQuantity, CASE WHEN Sum(BeerStock.Quantity) < 0 THEN '' WHEN Sum(BeerStock.Quantity) BETWEEN 0 AND 999 THEN 'Red' WHEN Sum(BeerStock.Quantity) BETWEEN 1000. 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). One more thing, You also need to use GROUP BY clause or else you will be returning only one record even if you have different records. The CASE statement is specifically for use in stored programs. The CASE OperatorĪs mentioned, in MySQL there’s a difference between the CASE statement and the CASE operator. See the MySQL CASE operator for an example of how the second syntax (the searched CASE expression) works. 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', ) It is better to use the ELSE block in CASE statements so that if none of the. The simple CASE expression compares an expression to a set of simple expressions to determine the result. MySQL & MariaDB Tools Studio for MySQLCompare BundleSchema Compare More products. This syntax is referred to as the simple CASE expression. Here’s an example of a basic stored procedure with the first CASE syntax: DELIMITER | WHEN search_condition THEN statement_list The CASE statement can be used in two ways. Also, there’s a slight difference in the syntax. Definition and Usage The CASE statement goes through conditions and return a value when the first condition is met (like an IF-THEN-ELSE statement). The CASE statement is different to the CASE operator, in that the CASE statement is specifically for use in stored programs. It compares a list of conditions and returns a different result depending on which condition (if any) is matched. The following example would replace the name column rather than add a new column for the full name if used in a stored procedure: CASE nameĪs with the case operator, case_value can be omitted when referring to the columns by name in each WHEN statement.In MySQL, the CASE statement can be used in stored programs to perform a complex conditional construct. Instead of providing a result for each WHEN clause to set a column value, you can provide a list of statements to be executed. for the right syntax to use near 'AS small, CASE (Amount > 0) I want my output like so Name Colour Small Large item1 red -35 item2 blue 48 etc. SELECT t.name, t.colour, CASE WHEN (Amount < 0) AS small, CASE WHEN (Amount > 0) AS large FROM t Error.The CASE statement is best used for stored programs and has a slightly different syntax. 1 I am trying to use a select case statement on mysql DB. | 5 | Zak | It's not short for anything | | 4 | Pip | It's not short for anything | ![]() Otherwise, the column name would default to the query text, which looks very messy and is functionally useless.īoth of the above queries will return: | id | name | fullname | Note that in both of the above examples, the AS statement is used to name the column generated by the CASE operator. If you are building case statements using more than a single column, you can omit the column name from the CASE statement and use the column names in each WHEN statement: SELECT *,
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