Can you use an OR statement in a case statement?
It is practically not possible to use OR statement in CASE statement as the structure of the CASE statement is very different.
Which is better case or if else in SQL?
It is not about which one is “better”. IF and Case are just completely different. If statements are used to control flow of steps in a batch and a case statement determines which value to use in a column of a select statement. Notice in your first example you may not get a result if the condition is false.
Can we use and in case statement in SQL?
CASE must include the following components: WHEN , THEN , and END . ELSE is an optional component. You can make any conditional statement using any conditional operator (like WHERE ) between WHEN and THEN . This includes stringing together multiple conditional statements using AND and OR .
Can we write CASE statement in where clause?
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.
Is else mandatory in CASE statement 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.
How many tables can be join in SQL query?
Theoretically, there is no upper limit on the number of tables that can be joined using a SELECT statement. (One join condition always combines two tables!) However, the Database Engine has an implementation restriction: the maximum number of tables that can be joined in a SELECT statement is 64.
How use multiple IF condition in SQL query?
If you are checking conditions against multiple variables then you would have to go for multiple IF Statements, Each block of code will be executed independently from other blocks. ELSE IF(@ID IS NOT NULL AND @ID in (SELECT ID FROM Places)) — Outer Most Block ELSE IF BEGIN SELECT @MyName = Name … …
How do you do not in SQL?
Overview. The SQL Server NOT IN operator is used to replace a group of arguments using the <> (or !=) operator that are combined with an AND. It can make code easier to read and understand for SELECT, UPDATE or DELETE SQL commands.
How does case work in SQL?
- CASE WHEN is used to determine conditional statements in SQL. CASE declares the start of the conditions. WHEN declares a condition. THEN declares the return of a true condition. …
- You can have a multitude of WHEN statements.
- AS can be used to create a header for the return data, otherwise it is given the header “case”
What is SQL IIF?
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.