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15 wrz 2008 · The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server. SELECT CAST ( CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product. You only need to use the CAST operator if you want the result as a Boolean value.
28 maj 2024 · In this article, we explored different options for executing IF-THEN logic in a SQL SELECT statement. These options include using CASE, IIF(), and CHOOSE(). Furthermore, if we want a query that’s used in almost every dialect, we must choose the CASE statement.
The SQL CASE Expression. The CASEexpression 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 ELSEclause.
4 Answers. Sorted by: 0. you have to select the table 1st if you want to review the result , try this. select CASE when ColB = 'March' THEN (Select ColA From yourtable where ColB = 'January') END . from yourtable .
3 wrz 2024 · CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as <select_list>, IN, WHERE, ORDER BY, and HAVING. Transact-SQL syntax conventions.
2 cze 2023 · The CASE statement allows you to perform an IF-THEN-ELSE check within an SQL statement. It’s good for displaying a value in the SELECT query based on logic that you have defined. As the data for columns can vary from row to row, using a CASE SQL expression can help make your data more readable and useful to the user or to the application.
16 sty 2024 · In the realm of SQL, the CASE WHEN statement functions much like an if-then-else expression, allowing us to create custom classifications within a query. Other programming languages use similar logic – e.g. Python uses if, elif, and else, and JavaScript uses the switch statement.
