I need to select the project rate or shift rate that has the effective date less than today. SELECT CASE WHEN ISNULL(s.rate,0) = 0 THEN SELECT TOP 1 pr.rate FROM ProjectRates pr WHERE (pr.projectID = p.ID) AND (pr.effectiveDate < GETDATE()) ORDER BY pr.effectiveDate DESC...
The simple way to achieve this goal is to add a CASE expression to your SELECT statement. In this article, we'll introduce you to the syntax, formats, and uses of the CASE expression. The CASE expression is a conditional expression: it evaluates data and returns a result.
Case Select – And / Or – Multiple Conditions. Nested Case Statements.
WHEN bool_expressionN THEN valueN ELSE valueElse END.
The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement).
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 result of the query is as follows: In this example, we used the CASE expression to return 1 or 0 if the rental rate falls into each price segment.
Now when we type the column name with the exact case then the CASE expression processes the data accordingly.
Here are 3 different ways to apply a case statement using SQL: (1) For a single condition: CASE WHEN condition_1 THEN result_1 ELSE result_2 END AS new_field_name.
In SELECT CASE, you can specify one condition and then specify a code to execute if that condition is true and then specify a second condition and a.