Αποτελέσματα Αναζήτησης
select case substr(status,1,1) -- you're only interested in the first character. when 'a' then 'Active'. when 'i' then 'Inactive'. when 't' then 'Terminated'. end as statustext. from stage.tst. However, there's a few worrying things about this schema.
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.
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. Table of Contents. What Does the SQL CASE Statement Do? SQL CASE Statement Syntax. Parameters of the CASE Statement.
15 Μαρ 2021 · WITH x AS ( SELECT level+1 a,level+2 b,level+3 c,level+4 d,level+5 e FROM dual CONNECT BY level <= 10) SELECT CASE a+b+c+d+e WHEN <30 THEN 'Below 30' WHEN <60 THEN 'Below 60' WHEN IS NULL THEN 'NULL' ELSE 'Above' END FROM x;
26 Ιαν 2018 · The CASE statement is conditional flow control syntax. Many languages have this feature. Oracle has implemented it in both PL/SQL and into the SQL engine. In PL/SQL, there are two flavors. First, the CASE statement evaluates the contents of a variable and returns a value (implemented as a function).
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.
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 boolean_expression THEN {statement;} ...
