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Is there a "better" way to rewrite a SELECT clause where multiple columns use the same CASE WHEN conditions so that the conditions are only checked once? See the example below. SELECT. CASE testStatus. WHEN 'A' THEN 'Authorized'. WHEN 'C' THEN 'Completed'. WHEN 'P' THEN 'In Progress'. WHEN 'X' THEN 'Cancelled'. END AS Status,
31 Μαρ 2009 · If each case only allows one column, then you probably need two cases: select col1,col2, case when col3='E01089001' then (select 1 from dual) else (select 2 from dual) end, case when col3='E01089001' then (select 3 from dual) else (select 4 from dual) end from Table1 where col1='A0529';
Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. The CASE expression evaluates a list of conditions and returns one of the multiple possible results.
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.
7 Ιουν 2016 · Your CASE statement doesn't include any other WHEN options for values other than "Day Start", so all the others will return as NULL. Either add another WHEN to handle the other values or use your WHERE clause to only return "Day Start" values if that is your goal. –
A CASE expression evaluates a list of conditions and returns one of multiple possible result expressions. The result of a CASE expression is a single value whereas the result of a CASE statement is the execution of a sequence of statements.
11 Ιουλ 2016 · In Oracle string literals need to be surrounded in single quotes. To find a sub-string match you can either use LIKE: SELECT ID, NAME, CASE WHEN Descr LIKE '%Test%' THEN 'Contains Test'. WHEN Descr LIKE '%Other%' THEN 'Contains Other'. ELSE 'No Match'.
