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The CASE Expression
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The CASE expression is a recent addition to the SQL standard but an important one. For the rst time, parts of SQL statements can be executed conditionally. For example, a column in the query results may be formatted based on the values contained in another column. However, your SQL implementation may not support it just yet because it is so new. The CASE expression allows two general forms.
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Simple CASE Expression
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Here is the general syntax of the simple form of the CASE expression:
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CASE input_expression WHEN comparison_expression THEN result_expression [WHEN comparison_expression THEN result_expression ...] [ELSE result_expression] END
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N OTE : Each WHEN condition is evaluated as input_expression = comparision_ expression, and if the result is a logical TRUE, the result_expression is returned and no other WHEN conditions are evaluated. If none of the WHEN conditions evaluates to TRUE, and there is an ELSE condition, the result_expression associated with the ELSE condition is returned. If none of the WHEN conditions evaluates to TRUE, and there is no ELSE condition, a null value is returned. As an example, you can use the CASE expression to translate the MPAA Rating Code to a simple message that can be displayed at the checkout counter in the video store to remind sales clerks to check customer ages for movies rated above PG-13. Note the placement of the AS keyword just after the END keyword to assign a column name to the generated column in the result set. Here is the example:
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SELECT MOVIE_ID, MPAA_RATING_CODE AS RATING, CASE MPAA_RATING_CODE WHEN 'G' THEN 'All ages' WHEN 'PG' THEN 'Parental guidance' WHEN 'PG-13' THEN 'Ages 13 and up' ELSE 'MUST be at least 17' END AS RATING_DESC FROM MOVIE ORDER BY MOVIE_ID; MOVIE_ID ---------1 2 3 4 5 6 7 8 9 10 11 12 13 14 RATING -----R R PG-13 PG-13 R PG-13 PG-13 R PG-13 R PG-13 PG-13 PG-13 R RATING_DESC ------------------MUST be at least 17 MUST be at least 17 Ages 13 and up Ages 13 and up MUST be at least 17 Ages 13 and up Ages 13 and up MUST be at least 17 Ages 13 and up MUST be at least 17 Ages 13 and up Ages 13 and up Ages 13 and up MUST be at least 17
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15 16 17 18 19 20 R PG-13 PG-13 R PG-13 R MUST Ages Ages MUST Ages MUST be 13 13 be 13 be at least 17 and up and up at least 17 and up at least 17
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Searched CASE Expression
The so-called searched CASE expression allows for more exible comparison conditions because each one is written as a complete condition, including the comparison operator. Here is the general syntax:
CASE WHEN condition THEN result_expression [WHEN condition THEN result_expression ...] [ELSE result_expression] END
N OTE : Each condition can be any SQL expression that evaluates to TRUE or FALSE. Each WHEN is evaluated in sequence, and if one of them evaluates to TRUE, the associated result_condition is returned and no other WHEN conditions are evaluated. If none of the WHEN conditions evaluates to TRUE, and there is an ELSE condition, the result_expression associated with the ELSE condition is returned. If none of the WHEN conditions evaluates to TRUE, and there is no ELSE condition, a null value is returned. As an example, here is a query that classi es VHS movies by price range:
SELECT MOVIE_ID, RETAIL_PRICE_VHS, CASE WHEN RETAIL_PRICE_VHS IS NULL THEN 'Not Available' WHEN RETAIL_PRICE_VHS < 10 THEN 'Bargain' WHEN RETAIL_PRICE_VHS < 20 THEN 'Budget' WHEN RETAIL_PRICE_VHS < 40 THEN 'Average' ELSE 'Premium'
Advance Query Writing
END AS PRICE_CATEGORY FROM MOVIE ORDER BY MOVIE_ID; MOVIE_ID RETAIL_PRICE_VHS PRICE_CATEGORY ---------- ---------------- -------------1 58.97 Premium 2 15.95 Budget 3 14.95 Budget 4 11.95 Budget 5 24.99 Average 6 24.99 Average 7 14.95 Budget 8 50.99 Premium 9 12.98 Budget 10 49.99 Premium 11 6.93 Bargain 12 9.95 Bargain 13 6.93 Bargain 14 24.99 Average 15 9.99 Bargain 16 11.69 Budget 17 14.94 Budget 18 24.99 Average 19 12.98 Budget 20 17.99 Budget
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