Can we use or condition in CASE?
It is practically not possible to use OR statement in CASE statement as the structure of the CASE statement is very different.
How do I write a case statement in SQL db2?
In general, the value of the case-expression is the value of the result-expression following the first (leftmost) case that evaluates to true….Examples.
Expression | Equivalent Expression |
---|---|
CASE WHEN e1=e2 THEN NULL ELSE e1 END | NULLIF(e1,e2) |
CASE WHEN e1 IS NOT NULL THEN e1 ELSE e2 END | COALESCE(e1,e2) |
Can case statement return multiple values?
@yzhang – With CASE only the first match will return values. If you want the possibility of multiple conditions mathcing each input row, you need to make each check indpendantly, and UNION the results together.
Can we use and in CASE statement?
The CASE statement always goes in the SELECT clause. CASE must include the following components: WHEN , THEN , and END . 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 .
What’s the difference between a union and a join?
UNION in SQL is used to combine the result-set of two or more SELECT statements. The data combined using UNION statement is into results into new distinct rows. JOIN combines data from many tables based on a matched condition between them. Number of columns selected from each table should be same.
How do you write multiple cases in a switch case?
default : // code inside the default case . } You can combine multiple cases as you can see in syntax. Whenever you want to combine multiple cases you just need to write a case with case label and colons(:). You can’t provide the break statement in between of combined cases.
What are the different types of CASE statements in DB2?
There are two types of case statements supported by DB2 which are simple case statement and the searched case statement. Both the case statements work in a similar manner and help to implement multiple expression evaluation and comparison based on which the result set can be modified.
What is SQL Server case statement with multiple conditions called?
SQL case statement with multiple conditions is known as the Search case statement. So, You should use its syntax if you want to get the result based upon different conditions -.
What happens if case_value does not exist in SQL?
If ELSE does not exist and case_value also does not match any of the values, Case will return a NULL value. SQL case statement with multiple conditions is known as the Search case statement. So, You should use its syntax if you want to get the result based upon different conditions -.
What is the case expression in the second Proc SQL step?
The CASE expression in the second PROC SQL step is a shorthand method that is useful when all the comparisons are with the same column. Note: When you use the shorthand method, the conditions must all be equality tests.