¿Cómo se utiliza en condición en una declaración de caso?

How do you use in condition in a case statement?

The CASE statement goes through conditions and returns 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 returns the value in the ELSE clause.

The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause. It can be used in the Insert statement as well.

Switch Case Syntax The expression can be integer expression or a character expression. Value-1, 2, n are case labels which are used to identify each case individually. Remember that case labels should not be same as it may create a problem while executing a program.

The switch-case construct is pretty similar to an if-else statement, you can use the OR operator in an if however.

At line case when Invoice_DeliveryType <> ‘USPS’ then ” else ‘Y’ end as Invoice_eDeliver I need to check for a valid email address (if email is valid, display Y, else display N).

If for some reason you really do want to use a CASE statement, you’d need the CASE to return a value that you check in the WHERE clause. For example This is not generally the clearest way to express this sort of condition, however. Not sure what you want to happen in the NULL situation.

You can use a CASE expression in any statement or clause that accepts a valid expression. For example, you can use the CASE expression in statements such as SELECT, UPDATE, or DELETE, and in clauses like SELECT, WHERE, HAVING, and ORDDER BY.

CASE can be nested in another CASE as well as in another IF…ELSE statement. In addition to SELECT, CASE can be used with another SQL clause like UPDATE, ORDER BY. ELSE is optional in the CASE statement.