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  1. REFERENCE
  2. SQL Reference
  3. SQL Functions
  4. Conditional

CASE

Evaluates a list of conditions and returns the first resulting true expression. If a true expression is not found, will return the ELSE statement, if present, or else will return NULL.

Syntax

CASE expression WHEN condition THEN result [ …n ] [ ELSE result ] END → same as input type

  • expression: A valid SQL expression, typically, a column name.

  • condition: A boolean expression. If condition is true, then return result.

  • result: A valid SQL expression.

Examples

CASE example
SELECT
CASE categories
     WHEN 'Restaurants' THEN 'food'
     WHEN 'Hotels' THEN 'travel'
     ELSE 'no result'
END
FROM table-name

-- food

CASE WHEN condition THEN result [ …n ] [ ELSE result ] END → same as input type

  • condition: A boolean expression. If expression=condition is true, then return result.

  • result: A valid SQL expression.

Examples

CASE example
SELECT
CASE
     WHEN categories='Restaurants' THEN 'food'
     WHEN categories='Hotels' THEN 'travel'
     ELSE 'no result'
END
FROM table-name

-- food

Last updated 2 years ago

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