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21 lis 2017 · Oracle 11g R2 Schema Setup: Query 1: SUM( CASE WHEN cond > 0 THEN A_amount END ) AS S_A_amount, SUM( CASE WHEN cond > 0 THEN B_amount END ) AS S_B_amount, CASE WHEN SUM(C_amount)>3 THEN 6 ELSE SUM(C_amount) END AS S_C_amount. Results: where is the SUM? He needs the SUM of the SUMs. @Thomas Inside the CASE expression.
15 gru 2020 · Starting to Unlock the Possibilities of the CASE WHEN Expression? This article will teach you what a CASE WHEN expression is in SQL and how to use it with a SUM () function and a GROUP BY statement. The examples are included to bolster your understanding.
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.
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.
PL/SQL also supports CASE statements. Instead of returning one value, these can run many actions. For example assigning a grade and outcome to each result.
The syntax for the CASE statement in Oracle/PLSQL is: CASE [ expression ] WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 ... WHEN condition_n THEN result_n ELSE result END Parameters or Arguments expression Optional. It is the value that you are comparing to the list of conditions.
26 sty 2018 · Using the example below, if the student usually gets a ‘C’, then put the evaluation for grade = ‘C’ first in the CASE statement. This CASE syntax is evaluating the contents of the selector and returning a result. The result can also be a calculation, columns, concatenated columns/text, etc.
