Mysql case when in list
I have a procedure that contains CASE expression statement like so: Show
When I call the above procedure, cases with asked Jul 8, 2014 at 11:26
Question OverflowQuestion Overflow 10.5k18 gold badges71 silver badges108 bronze badges 2
You can use one of expresions that WHEN has, but you cannot mix both of them. 1) WHEN when_expression Is a simple expression to which input_expression is compared when the simple CASE format is used. when_expression is any valid expression. The data types of input_expression and each when_expression must be the same or must be an implicit conversion. 2) WHEN Boolean_expression Is the Boolean expression evaluated when using the searched CASE format. Boolean_expression is any valid Boolean expression. You could program: 1)
2)
But in any case you can expect that the variable ranking is going to be compared in a boolean expresion. http://msdn.microsoft.com/en-us/library/ms181765.aspx answered Jul 8, 2014 at 11:34
4 you can use in to compare the values both numeric or character
this will also work in select statement and stored procedure also.
halfelf 9,21713 gold badges51 silver badges62 bronze badges answered Dec 11, 2018 at 6:18
PashPash 1973 silver badges10 bronze badges This is also possible: select (case when (var1 = 0 or var2 = 1) then 'x' else 'y' end) from... answered Oct 8, 2021 at 9:05
There are two different types of CASE quires. First Type ( matching value )MySQL Query Comparing with value, Syntax is here
Here A_value is matched with different values given under WHEN. If A_value equals to B_value then B_statement is executed. If it is not matched than next WHEN value C_value is checked. If nothing is matched then statement under X_statement is executed. If any WHEN statement
is matched then rest WHEN statements are not checked and matched statement is returned. Let us try one example
We can display based on the floor wise or location wise by using order by query
Second Type (Matching condition with CASE statement)In this case we don't specify any value or data to be matched, instead we work on testing some conditions and if it is True then respective statement is to be executed. Here we
check the condition and if it is True then the respective statement is executed. Example : We will try our student example. Here student grade is awarded based on the mark they got. Here is the query
Using BETWEEN QueryWhile grouping in a rang it is better to use MySQL BETWEEN Query
CASE with GROUP BYWe can further break the gender column to get number of male and female in each class by using SQL GROUP BY. Output
Using with NULL dataIf any column has NULL data and we want to return 'checked' when it is not null and return 'not_checked' when it is NULL. Here c_name is the column name storing the status of the record, checked or not. Download the SQL dump of the above student table ExampleBy using SQL CASE we can get records based on Financial Year wise.IF() function SQL sum in multiple columns GROUP BY Query WHEN CASE in MySQL query?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). 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.
Does case work in MySQL?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 .
WHEN THEN condition in MySQL?In MySQL, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
IS NULL MySQL case?You need to use IS NULL and IS NOT NULL property because NULL is a special case in MySQL.
|