Underline examples: - Identifier declaration - Error message - Warning message - Information message CREATE OR REPLACE FUNCTION ...

| -- Underline examples:   -- Identifier declaration   -- Error message   -- Warning message   -- Information message   CREATE OR REPLACE     FUNCTION booleantochar ( is_true BOOLEAN)   RETURN VARCHAR2     AS       BEGIN         IF( is_true )           THEN             RETURN 'TRUE';           ELSIF  NOT ( is_true )           THEN             RETURN 'FALSE';           ELSE             RETURN TO_CHAR (  NULL  ) ;         END IF;       END booleantochar;|
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