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You can rewrite it to use the ELSE condition of a CASE: SELECT status, CASE status WHEN 'i' THEN 'Inactive' WHEN 't' THEN 'Terminated' ELSE 'Active' END AS StatusText FROM stage.tst
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For example, you can use the CASE expression in statements such as SELECT, UPDATE, or DELETE, and in clauses like SELECT, WHERE, HAVING, and ORDDER BY. Oracle CASE expression has two formats: the simple CASE expression and the searched CASE expression. Both formats support an optional ELSE clause.
You can use CASE expressions in aggregate functions such as count. This returns columns for the pass and fail counts for each exam. It works because the CASE has no ELSE clause, meaning it returns NULL if the WHEN clause is not true. COUNT only processes non-null values, so gives the number of rows meeting the search condition.
In a simple CASE expression, Oracle Database searches for the first WHEN... THEN pair for which expr is equal to comparison_expr and returns return_expr. If none of the WHEN... THEN pairs meet this condition, and an ELSE clause exists, then Oracle returns else_expr. Otherwise, Oracle returns null.
Script Name Simple SQL CASE example Description In this simple CASE expression, Oracle Database evaluates the first WHEN and returns the THEN if satisfied. It next considers the next WHEN condition.
The CASE function specifies conditions and results for a select or update statement. You can use the CASE function to search for data based on specific conditions or to update values based on a condition. Example. SELECT CASE JOB WHEN 'PRESIDENT' THEN 'The Honorable' WHEN 'MANAGER' THEN 'The Esteemed' ELSE 'The good' END, ENAME FROM EMP;