![]() ![]() In scenarios where you don't use it, the query result returns NULL. If that is still not met then the ELSE condition gets executed.Īlso, the ELSE part is optional when using the CASE statement. If the first condition is not met it keeps on checking the other conditions until the nth (or final) condition. When you use the CASE statement, it has to be followed by a WHEN and THEN the result if the first condition is met. The SQL CASE statement has the following syntax: CASE If none of the conditions are met, then you use a final ELSE clause to return a fallback result. You use a THEN statement to return the result of the expression. You use the CASE keyword together with the WHEN clause to execute a block of conditional statement code. With SQL, you can do this using the CASE statement. In programming when you have a given set of conditions, you end up using conditionals ( switch or if else) to know which block of code to execute when a condition is met. What some important terms mean, like order by, limit, offset, left join and alias.How to solve an exercise using the SQL CASE statement.What the SQL CASE statement is and how it works.The value specified within the else is returned if no condition is satisfied. If the first condition is satisfied, the query stops executing with a return value. Writing SQL with multiple conditions can be an arduous task, especially if you need to make numerous checks.įor example, an if () else if () else check case expression handles all SQL conditionals. ![]()
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