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CASE expressions let you use IF ... THEN ... ELSE logic in SQL statements without having to invoke procedures. The syntax is: 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 ...
2 sty 2015 · SELECT event_id, trainee_id, (CASE eval WHEN 0 THEN 'Terrible' WHEN 1 THEN 'Bad' WHEN 2 THEN 'Mediocre' WHEN 3 THEN 'Fair' WHEN 4 THEN 'Good' ELSE cast(eval as varchar2(255)) END ) FROM booking; I would encourage you to use explicit casts.
7 gru 2023 · A case expression returns a single value. In PL/SQL you can write a case statement to run one or more actions. The differences between case expressions and statements are: You complete them with end case (instead of just end) Each then/else clause contains a statement, rather than returning a value
Oracle Database 23c extended CASE expressions in PL/SQL to support dangling predicates in simple CASE expression. These work like regular simple CASE expressions - you have a single selector. Each WHEN clause may contain a comparison condition and the right-hand side of the formula.
The CASE expression is like a more flexible version of the DECODE function. The value match CASE expression, or simple CASE expression, compares the value of the expression (DEPTNO), with the list of comparison expressions (10 - 40). Once it finds a match, the associated value is returned.
The CASE statement chooses from a sequence of conditions, and executes a corresponding statement. The CASE statement evaluates a single expression and compares it against several potential values, or evaluates multiple Boolean expressions and chooses the first one that is TRUE. Syntax. searched_case_statement ::=
FROM T1, T2 WHERE CASE T2.COMPARE_TYPE WHEN 'A' THEN T1.SOME_TYPE LIKE 'NOTHING%' ELSE T1.SOME_TYPE NOT LIKE 'NOTHING%' END I know that my WHERE is clause is not correct. Any help would be great in knowing if this type of statement is possible. I don't want to write a Dynamic SQL.
