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CASE expressions let you use IF... THEN... ELSE logic in SQL statements without having to invoke procedures. The syntax is:
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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.
This Oracle tutorial explains how to use the Oracle / PLSQL CASE statement with syntax and examples. The Oracle / PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement.
7 gru 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.
Following syntax would work :.... where x.p_NBR =to_number(substr(y.k_str,11,5)) and x.q_nbr = (case when instr(substr(y.m_str,11,9),'_') = 6 then to_number(substr(y.m_str,11,5)) when instr(substr(y.m_str,11,9),'_') = 0 then to_number(substr(y.m_str,11,9)) else 1 end )
The SQL CASE Expression. The CASEexpression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSEclause.
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. Syntax. searched_case_statement ::= [ <<label_name>> ] CASE { WHEN ...
