Can I use CASE statement in where clause in Oracle?

Can I use CASE statement in where clause in Oracle?

Introduction to Oracle CASE expression You can use a CASE expression in any statement or clause that accepts a valid expression. 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 .

Can we use CASE statement in where clause?

Another way to use the Case Statement is within the WHERE clause. There, it may be utilized to alter the data fetched by a query based on a condition. Within that context, the Case Statement is ideally suited to both static queries, as well as dynamic ones, such as those that you would find inside a stored procedure.

Can CASE be used in where clause SQL?

CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING.

What are the two types of CASE statement in PL SQL?

The CASE statement has two types: simple CASE statement and searched CASE statement. Both types of the CASE statements support an optional ELSE clause.

Can decode be used in where clause?

And Decode works in a similar fashion, although I think it’s less readable. SELECT (columns list) FROM AGREEMENT A WHERE A. ACCOUNT = 545 AND A. GRP_ID = DECODE(?, 0, A.

Can case statement return multiple values in Oracle?

A CASE statement cannot return more than one value, it is a function working on one value.

Can you use CASE statements in a join?

There are plenty of ways to resolve for this: a subquery with a CASE statement in the join statement for the table you are joining in, a CASE statement in a temp table where all values are changed to match, or this handy little trick of using a CASE statement in the JOIN’s ON clause.

Can we use and in CASE statement in SQL?

CASE must include the following components: WHEN , THEN , and END . ELSE is an optional component. You can make any conditional statement using any conditional operator (like WHERE ) between WHEN and THEN . This includes stringing together multiple conditional statements using AND and OR .

How do you write a case statement in SQL Server?

SQL Server CASE statement syntax It starts with the CASE keyword followed by the WHEN keyword and then the CONDITION. The condition can be any valid SQL Server expression which returns a boolean value. For instance, the condition can be model > 2000, the THEN clause is used after the CONDITION.

What are Oracle statements?

SQL statements are the means by which programs and users access data in an Oracle database. The sections that follow show each SQL statement and its related syntax.

What is CASE statement syntax?

The SQL CASE Statement The CASE statement 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 ELSE clause.

How to write a where clause in a case statement?

57 You can write the whereclause as: where (case when (:stateCode = ”) then (1) when (:stateCode != ”) and (vw.state_cd in (:stateCode)) then 1 else 0) end) = 1; Alternatively, remove the caseentirely:

What is the difference between T1 and T2 in where clause?

FROM T1, T2 WHERE CASE T2.COMPARE_TYPE WHEN ‘A’ THEN T1.SOME_TYPE LIKE ‘NOTHING%’ ELSE T1.SOME_TYPE NOT LIKE ‘NOTHING%’ END I know that my WHERE is clause is not correct.

How to use equals/in in a case statement?

The equals/in has to go after the end of the case. – Otherwise, do an exact match. – Checking the variable. If it equals then: Is this answer out of date? If it is, please let us know via a Comment You can also go the other way and push both conditionals into the where part of the case statement.

How to do a comparison outside the whole case statement?

This question is and we said… You need do to the comparison outside the whole case statement. So something like: case when then when then end = The equals/in has to go after the end of the case. – Otherwise, do an exact match. – Checking the variable.