如何从SSMS中两个不同查询得到的值计算百分比？

-- 第一个查询
SELECT COUNT(*) AS FirstValue FROM TableName WHERE Condition1;

-- 第二个查询
SELECT COUNT(*) AS SecondValue FROM TableName WHERE Condition2;

-- 计算百分比
SELECT ((SecondValue - FirstValue) / FirstValue) * 100 AS Percentage FROM (
  SELECT COUNT(*) AS FirstValue FROM TableName WHERE Condition1
) AS First, (
  SELECT COUNT(*) AS SecondValue FROM TableName WHERE Condition2
) AS Second;