How do you write a null in a case statement in SQL?

August 28, 2020 Off By idswater

How do you write a null in a case statement in SQL?

SQL offers two case abbreviations to cope with null : coalesce and nullif . Both are used like functions and do not use the keywords case , when , then , else and end .

How do you use null in a case statement?

So in your case you want to use:

  1. SELECT st3.description.
  2. , CASE WHEN st3.description IS NULL THEN ‘I am Null’ ELSE ‘I am NOT Null’ END Expr2.
  3. , ISNULL(st3.description, ‘Null Value’) AS Expr3.
  4. FROM structure AS st3.

Can we use case in where clause in SQL?

CASE STATEMENT IN WHERE CLAUSE: We can use a case statement in Where, Order by and Group by clause. So, by using a CASE statement with the where condition displays the result.

Can we use CASE statement without else in SQL?

3 Answers. You can use a WHERE clause to restrict the output. Or if you wanted to showcase some other value instead of null use an else part inside the CASE statement.

What kind of statement is the if statement?

An if statement is a programming conditional statement that, if proved true, performs a function or displays information. Below is a general example of an if statement, not specific to any particular programming language.

How do I check if a SQL statement is null?

How to Test for NULL Values?

  1. SELECT column_names. FROM table_name. WHERE column_name IS NULL;
  2. SELECT column_names. FROM table_name. WHERE column_name IS NOT NULL;
  3. Example. SELECT CustomerName, ContactName, Address. FROM Customers. WHERE Address IS NULL;
  4. Example. SELECT CustomerName, ContactName, Address. FROM Customers.

What keyword is used to end a CASE statement?

The WHEN statement specifies the condition to be tested. The THEN statement specifies the action if the WHEN condition returns TRUE. The ELSE statement is optional and executes when none of the WHEN conditions return true. The CASE statement ends with an END keyword.

Can we use decode 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.

What can be used instead of case in SQL?

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

What are the two types of IF statement?

There are three forms of IF statements: IF-THEN , IF-THEN-ELSE , and IF-THEN-ELSIF .