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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.
SELECT, WHERE or ORDER BY clauses for example. I like Oracle’s high level description of CASE which sums up what we’re going to use it for. “CASE expressions let you use IF ...
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.
2 Ιουν 2023 · The SQL CASE statement allows you to perform IF-THEN-ELSE functionality within an SQL statement. Learn more about this powerful statement in this article. This article applies to Oracle, SQL Server, MySQL, and PostgreSQL.
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.
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';
Communicating with an RDBMS Using SQL I-26 Oracle’s Relational Database Management System I-27 ... Using the iSQL*Plus DEFINE Command 2-29 Using the VERIFY Command 2-30 Summary 2-31 Practice 2: Overview 2-32 ... Matching the SELECT Statement: Example 7-20 Controlling the Order of Rows 7-21 Summary 7-23 Practice 7: Overview 7-24 ...
