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SQL CASE Keyword


The CASE command is used is to create different output based on conditions.

The following SQL goes through several conditions and returns a value when the specified condition is met:


SELECT OrderID, Quantity,
    WHEN Quantity > 30 THEN 'The quantity is greater than 30'
    WHEN Quantity = 30 THEN 'The quantity is 30'
    ELSE 'The quantity is under 30'
FROM OrderDetails;
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The following SQL will order the customers by City. However, if City is NULL, then order by Country:


SELECT CustomerName, City, Country
FROM Customers
    WHEN City IS NULL THEN Country
    ELSE City
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