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Can we declare variable in switch case JavaScript?
JavaScript: Can I declare variables inside switch cases? [duplicate] Closed 5 years ago. In C language, you cannot declare any variables inside ‘case’ statements. However, you can when you use with curly parentheses.
What is switch in C language?
The switch statement is a multiway branch statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression. Switch is a control statement that allows a value to change control of execution.
Why is switch better than if?
A switch statement is usually more efficient than a set of nested ifs. The compiler can do this because it knows that the case constants are all the same type and simply must be compared for equality with the switch expression, while in case of if expressions, the compiler has no such knowledge. …
How to set a variable inside a case statement?
WHEN CategoryNumber = ‘101010111414’ THEN SET @PhoneGroup = (@PhoneGroup + 1) –< or something like this [/color] See if this helps.. SET @iGroupID = GroupID = CASE WHEN CategoryNumber = ‘101010111414’ THEN @iGroupID + 1 ELSE @iGroupID END
Can you use a variable in a case expression?
If you want to use individual variables, you need individual case expressions. You can’t evaluate and assign a variable in each portion of a case expression. I would recommend that you use a single variable like @a_Year and then you can use. directly but I have to add value of REVENUE_YOY what i will get when NOR.FISCAL_YEAR=’2008′.
Can you set a variable inside a SELECT statement?
I was trying this set @a_2008= (when NOR.FISCAL_YEAR=’2008′ then REVENUE_YOY ) inside that select statement but it showing error to me. If you want to use individual variables, you need individual case expressions.
When to use if or else in case statement?
If your real logic is more complicated (e.g. need to set multiple variables inside a condition) look at IF ELSE instead. CASE is an expression not a flow of control construct. Thanks for contributing an answer to Stack Overflow!