Count how many variables equal a target value



  • 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 @target.

    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 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




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