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31 Μαρ 2009 · Case does support multiple columns in the conditional check. CASE WHEN A=X AND B=Y THEN ... END What you are trying to do in your example is return a table (2 columns) into a resultset that expects one column: col1, col2, (col3,col4). You need to return them separately: col1, col2, col3, col4
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
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.
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. You can use a CASE expression in any statement or clause that accepts a valid expression.
25 Νοε 2021 · The longer answer is you can do things like: - Concatenate all the columns into one with a known separator. Then split them out afterwards. - Load the values to an XML document and extract out as needed. select case when 1 in ( 1, 2, 3 ) then xmltype ( cursor ( select 'abc' as "name 1", 'xyz' as "name 2" from dual ) ) else xmltype ( cursor ( ...
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 .
23 Αυγ 2024 · Multiple CASE WHEN statements allow you to implement conditional logic in SQL queries, allowing for the evaluation of multiple conditions and the execution of different actions based on those conditions. Here is the basic syntax of a Multiple CASE WHEN statement:
