casewhen usage in oracle-Oracle-php.cn

The CASE WHEN statement in Oracle is used to return different values ​​based on conditions. Syntax: CASE WHEN condition THEN result ELSE default_result END. Usage: 1. Condition check: WHEN clause contains the condition and returned result; 2. Default result: ELSE clause specifies the default result when any condition is not met. Example: Return income_level based on salary value: salary > 5000: high income; 3000 ≤ salary ≤ 5000: middle income; salary

CASE WHEN usage in Oracle

The CASE WHEN statement is a conditional expression that is used to Group conditions return different values. It is very useful when dealing with complex data queries and operations.

Syntax:

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Result:

This query will return the income_level column based on the employee’s salary value:

• salary > 5000: high income
• 3000 ≤ salary ≤ 5000: middle income
• salary

  Note:

  • The conditions in the CASE statement can use any valid SQL expression.
  • CASE statements can be nested, allowing the creation of more complex branching logic.
  • In some cases, the CASE statement can be replaced by the DECODE function, which has a more concise syntax.

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