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Learn how to use the Oracle CASE expression to add if-else logic to SQL statements without calling a procedure. See examples of simple and searched CASE expressions in SELECT, UPDATE, and HAVING clauses.
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.
This Oracle tutorial explains how to use the Oracle / PLSQL CASE statement with syntax and examples. The Oracle / PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement.
select case substr(status,1,1) -- you're only interested in the first character. when 'a' then 'Active'. when 'i' then 'Inactive'. when 't' then 'Terminated'. end as statustext. from stage.tst. However, there's a few worrying things about this schema.
Learn how to use the CASE statement to choose from a sequence of conditions and execute a corresponding statement in Oracle Database SQL. See syntax, examples, and usage notes for simple and searched CASE statements.
8 lut 2023 · Funkcja CASE w Oracle SQL jest jedną z najbardziej przydatnych funkcji języka SQL. Służy do wykonywania warunkowych operacji na danych w bazie danych. Pozwala na wykonywanie różnych operacji w zależności od wartości danego wiersza lub kolumny.
Learn how to use the CASE statement to choose from a sequence of conditions and run a corresponding statement in Oracle Database PL/SQL. See syntax, semantics, examples, and related topics for simple and searched CASE statements.
