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    7. CASE

    expressions allow conditional processing in EQL, allowing you to make decisions at query time.

    The syntax of the expression, which conforms to the SQL standard, is: CASE WHEN <Boolean-expression> THEN <expression> [WHEN <Boolean-expression> THEN <expression>]* [ELSE expression] END

    expressions must include at least one expression.

    The first expression with a condition is the one selected. is not .

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    The optional clause, if it appears, must appear at the end of the statement and is equivalent to . If no condition matches, the result is or the empty set, depending on the data type of the expressions.

    In this example, division by non-positive integers is avoided: CASE WHEN y < 0 THEN x / (0 - y) WHEN y > 0 THEN x / y ELSE 0 END
    In this example, records are categorized as Recent or Old: RETURN Result AS SELECT CASE WHEN (Days < 7) THEN 'Recent' ELSE ‘Old’ END AS Age ...
    The following example groups all records by class and computes the following:
    • The minimum DealerPrice of all records in class H.