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6 Μαΐ 2015 · You should use a (left) outer join to solve such case. NVL/COALESCE will take care of replacing NULL by some hard coded value. Something like that: SELECT T...., T...., NVL(USR.NAME, 'NO PR_USER' ) FROM USER T LEFT JOIN USER USR ON USR.USER_ID=T.PR_USER_ID
10 Ιουν 2019 · Query below return all events scheduled in Oracle database with details. Query select owner as schema_name, job_name, job_style, case when job_type is null then 'PROGRAM' else job_type end as job_type, case when job_type is null then program_name else job_action end as job_action, start_date, case when repeat_interval is null then schedule_name ...
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.
7 Δεκ 2023 · How to use CASE for IF-THEN logic in SQL SELECT. If you want to see the grade for each exam, select the case expression like a regular column: It’s a good idea to give the expression an alias. This is particularly important if the case is in a subquery.
15 Μαρ 2021 · WITH x AS ( SELECT level+1 a,level+2 b,level+3 c,level+4 d,level+5 e FROM dual CONNECT BY level <= 10) SELECT CASE a+b+c+d+e WHEN <30 THEN 'Below 30' WHEN <60 THEN 'Below 60' WHEN IS NULL THEN 'NULL' ELSE 'Above' END FROM x;
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.
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