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You don't have to use CASE...WHEN, you could use an OR condition, like this: WHERE pw='correct' AND (id>=800 OR success=1) AND YEAR(timestamp)=2011 this means that if id<800, success has to be 1 for the condition to be evaluated as true.
There is also a CASE operator, which differs from the CASE statement described here. See Section 14.5, “Flow Control Functions”. The CASE statement cannot have an ELSE NULL clause, and it is terminated with END CASE instead of END. For the first syntax, case_value is an expression.
MySQL CASE expression is a control flow structure that allows you to add if-else logic to a query. Generally speaking, you can use the CASE expression anywhere that allows a valid expression e.g., SELECT, WHERE and ORDER BY clauses. The CASE expression has two forms: simple CASE and searched CASE.
Important for some SQL functions that may deliver multiple result types, and is used to determine data type for function's parameters that cannot be type-resolved by looking at the context. An example of such function is '+', which may return INT, DECIMAL, DOUBLE, depending on arguments.
The CASE statement goes through conditions and return a value when the first condition is met (like an IF-THEN-ELSE statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it will return the value in the ELSE clause. If there is no ELSE part and no conditions are true, it returns NULL. Syntax
7 mar 2019 · I'm working in a project with MySQL and using stored procedures to make my SELECT queries, so all of them have this same structure: BEGIN. SELECT * FROM `foo` WHERE . CASE. WHEN `column_selector` IS NULL THEN 1 . WHEN `column_selector` = 1 THEN `foo`.`column_1` = `value` WHEN `column_selector` = 2 THEN `foo`.`column_2` = `value` END.
1 lip 2016 · WHERE Phone= dbo.FormatPhone(@Phone) Now here I understand that formatting has to be applied on the variable on column. But should I apply it on variable to assign to some other local variable then use it (as below). FROM Members (NOLOCK) WHERE Phone= @SomeVar. Which way is better or both are good? EDIT: And how is first query different from.
