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7 Ιαν 2013 · Using a SELECT statement with a searched CASE expression. Within a SELECT statement, the searched CASE expression allows for values to be replaced in the result set based on comparison values. The following example displays the list price as a text comment based on the price range for a product.
The CASE expression provides conditional SQL expressions. You can use case expressions anywhere you can use an expression. The syntax of the CASE expression is as follows: CASE expression. WHEN expression THEN expression [, …] [ ELSE expression ] END. You cannot use a subquery as a value expression in a CASE statement.
7 Μαΐ 2017 · 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.
Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. The CASE expression evaluates a list of conditions and returns one of the multiple possible results. You can use a CASE expression in any statement or clause that accepts a valid expression.
SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
In a simple CASE expression, Oracle Database searches for the first WHEN ... THEN pair for which expr is equal to comparison_expr and returns return_expr. If none of the WHEN ... THEN pairs meet this condition, and an ELSE clause exists, then Oracle returns else_expr. Otherwise, Oracle returns null.
2 Ιουν 2023 · SQL CASE Statement Syntax. The syntax of the SQL CASE expression is: CASE [expression] WHEN condition_1 THEN result_1. WHEN condition_2 THEN result_2 ... WHEN condition_n THEN result_n. ELSE result. END case_name. The CASE statement can be written in a few ways, so let’s take a look at these parameters. Parameters of the CASE Statement.
