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The CASE expression 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.
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CASE WHEN Quantity > 30 THEN 'The quantity is greater than...
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SQL Statement: SELECT CustomerName, City, Country FROM...
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13 cze 2021 · For SQL Server: CASE case-expression WHEN when-expression-1 THEN value-1 [ WHEN when-expression-n THEN value-n ... ] [ ELSE else-value ] END or: CASE WHEN boolean-when-expression-1 THEN value-1 [ WHEN boolean-when-expression-n THEN value-n ... ] [ ELSE else-value ] END expressions, etc:
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.
16 sty 2024 · Understanding CASE WHEN Syntax. Basic Syntax: CASE WHEN THEN. CASE WHEN THEN ELSE. Multiple THENs in CASE WHEN. Examples of Using CASE WHEN in Data Analysis. Example 1: Categorizing Data. Example 2: Handling NULL Values. Example 3: Creating Aggregated Columns. Example 4: Marketing Analysis. Example 5: Customer Segmentation.
The CASE statement returns the result_1, result_2, or result_3 if the expression matches the corresponding expression in the WHEN clause. If the expression does not match any expression in the WHEN clause, it returns the esle_result in the ELSE clause. The ELSE clause is optional.
20 kwi 2021 · ELSE statements into your Microsoft SQL Server T-SQL code. CASE is used within a SQL statement, such as SELECT or UPDATE. Don’t mistake CASE for the IF ELSE control of flow construct, which is used to evaluate the conditional execution of SQL statements. Let’s illustrate with an example.
Both of CASE expression formats support an optional ELSE statement. Because CASE is an expression, you can use it in any clause that accepts an expression such as SELECT, WHERE, GROUP BY, and HAVING. SQL Server simple CASE expression. The following shows the syntax of the simple CASE expression: CASE input . WHEN e1 THEN r1. WHEN e2 THEN r2. ...
