Can I put a CASE statement in WHERE clause?

Can I put a CASE statement in WHERE clause?

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.

Can we use CASE statement in FROM clause in SQL?

No, you can’t pick a table to query using a CASE statement. CASE statements only go within expressions, such as for a column’s value or as part of your WHERE expression.

How do you write a CASE statement in SELECT query in Oracle?

SELECT table_name, CASE owner WHEN ‘SYS’ THEN ‘The owner is SYS’ WHEN ‘SYSTEM’ THEN ‘The owner is SYSTEM’ END FROM all_tables; With the ELSE clause omitted, if no condition was found to be true, the CASE statement would return NULL.

How is a CASE statement executed in Oracle?

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 .

Can I use CASE in WHERE clause Oracle?

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 in WHERE clause in Oracle?

Can we use CASE statement in FROM clause in Oracle?

No, you can’t do that.

Can we use CASE in where clause in Oracle?

Can subquery be used inside a case statement?

To answer your question, Yes, you can have a subquery inside a Case statement.

Can we use CASE statement in update query?

CASE statement works like IF-THEN-ELSE statement. I have SQL server Table in which there is column that I wanted to update according to a existing column value that is present in current row. In this scenario, we can use CASE expression. CASE expression is used for selecting or setting a new value from input values.

What is CASE expression in SQL?

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.

Can we use case in WHERE clause Oracle?

Can we write select query in case statement?

The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause. It can be used in the Insert statement as well.

Can we use CASE in WHERE clause in Oracle?

Which of the following is the syntax for case statement?

Which of the following is correct syntax for CASE statement? Explanation: The CASE statement is started with the keyword CASE followed by any identifier or expression and the IS.