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15 wrz 2008 · Once you figure out how it works, you can convert three results to two results by deciding the behavior of null. E.g. this would treat null as not saleable: SELECT CASE WHEN obsolete = 'N' OR instock = 'Y' THEN 'true' ELSE 'false' -- either false or null END AS saleable. Share.
SELECT CASE WHEN ColB = 'March' THEN (Select ColA FROM tablename WHERE ColB = 'January') END FROM tablename Or can be done without a CASE would be. SELECT (SELECT colA FROM tablename WHERE colB = 'January') FROM tablename WHERE colB = 'March' See example of second running here
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.
In this example: First, declare two variables @x and @y and set their values to 10 and 20 respectively: DECLARE @x INT = 10, @y INT = 20; Code language: SQL (Structured Query Language) (sql) Second, the output IF statement check if @x is greater than zero. Because @x is set to 10, the condition (@x > 10) is true.
21 lip 2023 · Here are some advanced examples showcasing the usage of IF-THEN statements in SQL Server, along with common pitfalls to avoid and best practices to follow. Example 1: Nested IF-THEN Statements You can nest IF-THEN statements to handle multiple conditions and execute specific code blocks accordingly.
12 wrz 2022 · The following example SELECT statement checks to see if a customer id exists in the customer table. IF statements combined with the EXISTS function are common to validate parameter values.
3 wrz 2024 · The following example uses IF...ELSE to determine which of two responses to show the user, based on the weight of an item in the DimProduct table.
