Question

我有这个SQL查询：

select COUNT(batch_id) AS cc FROM tbl_associate_593932 WHERE induction_result>50 GROUP BY batch_id

此查询仅使用一列cc正确执行。现在我希望从此列中的值中获取最大值。我试过这样的事情：

select max (cc) from  (select COUNT(batch_id) AS cc FROM tbl_associate_593932 WHERE induction_result>50 GROUP BY batch_id);

然而在SQL Server中，它给了我错误：';'附近的语法不正确。期待AS，ID或Quoted_ID

和另一个错误无效的列名'cc'。

如何在SQL Server中执行此操作。可以在Oracle中完成吗？

Answer 1

你可以这样做：

WITH CTE
AS
(
   select COUNT(batch_id) AS cc 
   FROM tbl_associate_593932 
   WHERE induction_result > 50 
   GROUP BY batch_id
) 
SELECT MAX(cc)
FROM CTE;

或者：

SELECT TOP(1)
  COUNT(barch_id) AS cc
FROM tbl_associate_593932 
WHERE induction_result > 50 
GROUP BY batch_id
ORDER BY cc DESC;

Answer 2

使用：从（选择COUNT（batch_id）AS cc FROM tbl_associate_593932 WHERE induction_result＆gt; 50 GROUP BY batch_id）中选择max（t.cc）作为t;

从其他选择的结果中选择列

2 个答案: