Can I use CASE statement in WHERE clause in Oracle?

Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. 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 I use CASE statement in WHERE clause?

Where Can I use a CASE Statement? 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 if condition in WHERE clause in SQL?

If you want to apply some “IF” logic in the WHERE clause all you need to do is add the extra condition with an boolean AND to the section where it needs to be applied.

Can we use having and WHERE clause together in Oracle?

Introduction to the Oracle HAVING clause In this statement, the HAVING clause appears immediately after the GROUP BY clause. If you use the HAVING clause without the GROUP BY clause, the HAVING clause works like the WHERE clause. Note that the HAVING clause filters groups of rows while the WHERE clause filters rows.

How does case work in Oracle?

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 .

How many else clauses can an if statement have?

An IF statement can have any number of ELSIF clauses; the final ELSE clause is optional. Boolean expressions are evaluated one by one from top to bottom. If any expression returns TRUE , its associated sequence of statements is executed and control passes to the next statement.

What is difference between WHERE and HAVING clause in SQL?

WHERE Clause is used to filter the records from the table based on the specified condition. HAVING Clause is used to filter record from the groups based on the specified condition.