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3 lis 2018 · SELECT BIRTHDATE FROM SAMPLE_TABLE. WHERE. (CASE. WHEN (:from AND NOT :to) THEN BIRTHDATE >= :receivefrom. WHEN (:to AND NOT :from) THEN BIRTHDATE <= :to. WHEN (:to AND :from) THEN BIRTHDATE BETWEEN :from AND :to.
20 paź 2016 · You select only the records where the case statement results in a 1. Thanks for accepting this as the answer but Tony Andrews solution is a lot more straightforward and, in my view, the better answer.
7 gru 2023 · If you want to do if-else-then logic in select, where or anywhere else in a statement, you need a case expression. This is a series of when clauses that the database runs in order: For example, if you want to map exam correct percentages to grade letters according to these rules:
SELECT 4 AS SEQ, 'SOMETHING 2' AS SOME_TYPE FROM DUAL UNION ALL. SELECT 5 AS SEQ, 'SOMETHING 3' AS SOME_TYPE FROM DUAL UNION ALL. select 6 as seq, 'SOMETHING 4' AS SOME_TYPE from dual. SELECT 'A' AS COMPARE_TYPE FROM DUAL UNION ALL. SELECT 'B' AS COMPARE_TYPE FROM DUAL. SELECT T2.*, T1.*.
Db2 supports two kinds of CASE expressions: simple CASE and searched CASE expressions. Both simple and searched CASE are expressions, therefore, you can use them in any clause that accepts an expression such as SELECT , WHERE , GROUP BY , and HAVING clauses.
SELECT EMPNO, WORKDEPT, SALARY+COMM FROM EMPLOYEE WHERE (CASE WHEN SALARY=0 THEN NULL ELSE COMM/SALARY END) > 0.25; The following CASE expressions are the same: SELECT LASTNAME, CASE WHEN LASTNAME = 'Haas' THEN 'President' ... SELECT LASTNAME, CASE LASTNAME WHEN 'Haas' THEN 'President' ...
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.
