Question

我有三个整数变量： firstCount ， secondCount ， thirdCount 。我需要比较它并输出结果。我不擅长SQL，但C＃代码是这样的：

if(firstCount == secondCount == thirdCount)
  return true;
else
  return false;

Answer 1

单向（2008语法）。

SELECT CAST(CASE
         WHEN COUNT(DISTINCT C) = 1 THEN 1
         ELSE 0
       END AS BIT)
FROM   (VALUES (@firstCount),
               (@secondCount),
               (@thirdCount)) t (C)

Answer 2

    declare @first int
        , @second int
        , @third int

        select @first = 0
            , @second = 0
            , @third = 0

select case when (@first = @second) AND (@second = @third) THEN 1 ELSE 0 END

Answer 3

以下是一种方法，但在阅读@ meagar的评论后，我发现这个解决方案更优雅。只是等着他把它变成一个答案......

DECLARE @firstcount INTEGER
DECLARE @secondcount INTEGER
DECLARE @thirdcount INTEGER

SET @firstcount = 1
SET @secondcount = 2
SET @thirdcount = 3

IF @firstcount <> @secondcount SELECT 0
ELSE IF @secondcount <> @thirdcount SELECT 0
ELSE SELECT 1

Answer 4

你想说如果Firstcount等于第二个计数，secondcount等于第三个计数则返回true。

你可以做到

DECLARE @a INT = 2
DECLARE @b INT = 2
DECLARE @c INT = 2

IF (@a = @b AND @a = @c)
BEGIN
    Print('true')
END
ELSE
BEGIN
    Print('false')
END

虽然没有区别，但您不需要测试B = C，因为A = C完全相同，因为所有3个值都必须相同。

Answer 5

试试代码，

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比较三个变量

5 个答案: