All we need is an easy explanation of the problem, so here it is.
Is there a smart way to count how many variables equal some target value (in SQL Server)?
For example, if I have:
declare @a int = 1; declare @b int = 2; declare @c int = 1; declare @target int = 1;
Then I’d like to do how many of
@a, @b, @c eqauls
In imperative languages, it’s easy to make an inline array of the variables, and then count them – for example in JS:
var a = 1, b = 2, c = 2, target = 1; if ([a, b, c].filter(item => item == target).length == 1) // do something
The equivalent in SQL of that "inline array" would be a single column table, but this would require using
DECLARE TABLE, which I’d like to avoid.
Is there a similarly easy method for such counting in SQL?
Please note I’m less interested in "creating a table without declaring it" – what I really care about is the counting of variables against a target variable, so if it can be done without using tables at all, then it would be better.
How to solve :
I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.
How about this solution?
declare @a int = 1; declare @b int = 2; declare @c int = 1; declare @target int = 1; SELECT COUNT(*) FROM (VALUES (@a), (@b), (@c)) AS t(_value) WHERE t._value = @target
Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂