What is the difference between case and else statements in JavaScript?
Sep 18, 2014 · You do not need an else clause. If one isn't specified, case will return null. In other words, it acts as though it has an else null clause.
How do you USE CASE statement in SQL?
Does a case statement need an else? You do not need an else clause. If one isn't specified, case will return null . In other words, it acts as though it has an else null clause. Click to see full answer. Just so, can we write CASE statement without else in SQL?
How does the case statement return a value?
Feb 05, 2020 · Accordingly, can we write CASE statement without else in SQL? 2 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. Also Know, what does a case statement do? CASE Statement.
Do I need an ELSE clause in an IF statement?
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. If there is no ELSE part and no conditions are true, it returns NULL.
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.
Demo Database
Below is a selection from the "OrderDetails" table in the Northwind sample database:
SQL CASE Examples
The following SQL goes through conditions and returns a value when the first condition is met:
What Does the SQL CASE Statement Do?
The CASE statement allows you to perform an IF-THEN-ELSE check within an SQL statement.
Simple and Searched CASE Expressions
There are actually two ways to use an SQL CASE statement, which are referred to as a “simple case expression” or a “searched case expression”.
Examples of the CASE Statement
Here are some examples of the SQL CASE statement in SELECT queries. I find that examples are the best way for me to learn about code, even with the explanation above.
CASE Statement Frequently Asked Questions
In case you’re not sure, an IF statement allows you to do something if a condition is true, and something else if the condition is false.
There Is No IIF or IF in Oracle
SQL Server 2012 introduced a statement called IIF, which allows for an IF statement to be written.
Conclusion
Hopefully, that explains how the SQL CASE statement is used and answers any questions you had. If you want to know more, just leave a comment below.
What is a case statement?
Case statement controls the different sets of a statement based upon different conditions. It contains WHEN, THEN & ELSE statements to execute the different results with different comparison operators like =, >, >=, <, <= so on.
What happens when a condition is true in a case?
Case executes through the conditions and returns a result when the condition is true. Once a condition is true, It will stop reading the next statement and return the result. If all the conditions are false, It will return the result of the ELSE block.