What is the difference between IF and IIF in SQL?

IF IIF()
How is the result determined? You specify a SQL statement or statement block to execute. You specify the actual value to return.

What does IIF do in SQL?

IIF is a shorthand way for writing a CASE expression. It evaluates the Boolean expression passed as the first argument, and then returns either of the other two arguments based on the result of the evaluation.

How does if work in SQL?

Each IF statement has a condition. If the condition evaluates to TRUE then the statement block in the IF clause is executed. If the condition is FALSE , then the code block in the ELSE clause is executed.

Can I use IIF in where clause?

In this solution, you can use IIF clause instead of IF..ELSE to do conditional where clause. Given below is the script.

Which is better case or if else in SQL?

CASE statements are preferred because: SQL: They are ANSI standard, making it portable to other databases without need for alteration. they support “short circuiting”

Is true condition in SQL?

Logical Conditions

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Type of Condition Operation
AND Returns TRUE if both component conditions are TRUE . Returns FALSE if either is FALSE . Otherwise returns UNKNOWN .
OR Returns TRUE if either component condition is TRUE . Returns FALSE if both are FALSE . Otherwise returns UNKNOWN .

Can you use or in SQL?

The OR condition can be used in the SQL UPDATE statement to test for multiple conditions. This example would update all favorite_website values in the customers table to techonthenet.com where the customer_id is 5000 or the last_name is Reynolds or the first_name is Paige.

How do you do if then in SQL?

Syntax. IF (a <= 20) THEN c:= c+1; END IF; If the Boolean expression condition evaluates to true, then the block of code inside the if statement will be executed. If the Boolean expression evaluates to false, then the first set of code after the end of the if statement (after the closing end if) will be executed.

Is Empty in SQL?

Use the IS [NOT] EMPTY conditions to test whether a specified nested table is empty, regardless whether any elements of the collection are NULL . The condition returns a boolean value: TRUE for an IS EMPTY condition if the collection is empty, and TRUE for an IS NOT EMPTY condition if the collection is not empty.

Can we use case in where clause in SQL Server?

According to MS SQL Docs, a CASE statement can be used throughout the SELECT 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.

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What can we use instead of case in SQL?

Question: What is Alternative to CASE Statement in SQL Server? Answer: IIF Function.

What is the difference between IF and IIF?

They might then progress to an IF… ELSE statement, where they can determine another value to return if the expression is false. So therefore, return one value if the expression is true, and another value if it’s false.

The Differences.

IF IIF()
Type Flow control statement. Logical function.
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