Question

我的子查询获取了2013年的品牌名称和销售额总和。我的主要查询是尝试获取该年度的品牌名称和最高销售额，但这将返回重复，因为查询将尝试获取每个品牌名称的最大值（金额）。如何过滤它以便只返回一个品牌名称的最高金额？到目前为止，这是我的查询，任何指针都会有所帮助。谢谢！

SELECT
maxamt.brnd_nm, 
MAX(maxamt.amt) AS amt


FROM
(
SELECT 
c.brnd_nm AS BRND_NM,
SUM(b.sales_amt) AS AMT

FROM prd.client  A

INNER JOIN db1.table1  B
ON b.pty_key = a.pty_key
INNER JOIN db1.table2 c
ON b.d_key = c.d_key
INNER JOIN db1.table3 d
ON b.posat_key = d.posat_key
INNER JOIN db1.table4 e
ON b.frmly_key = e.frmly_key
WHERE   B.date BETWEEN '2013-01-01' 
    AND '2013-12-31'
    AND b.C_ID IN ( 'abc', 'def', 'wqs')

GROUP BY 1
) MaxAmt
GROUP BY 1

Answer 1

您不需要子查询，只需使用ORDER BY和LIMIT：

SELECT 
    c.brnd_nm AS BRND_NM,
    SUM(b.sales_amt) AS AMT

FROM prd.client  A

INNER JOIN db1.table1  B
    ON b.pty_key = a.pty_key
INNER JOIN db1.table2 c
    ON b.d_key = c.d_key
INNER JOIN db1.table3 d
    ON b.posat_key = d.posat_key
INNER JOIN db1.table4 e
    ON b.frmly_key = e.frmly_key
WHERE   B.date BETWEEN '2013-01-01' 
    AND '2013-12-31'
    AND b.C_ID IN ( 'abc', 'def', 'wqs')

GROUP BY BRND_NM
ORDER BY AMT DESC
LIMIT 1

Answer 2

您不能使用TOP运算符吗？：

SELECT TOP 1 *
FROM (  SELECT  c.brnd_nm AS BRND_NM,
                SUM(b.sales_amt) AS AMT
        FROM prd.client  A
        INNER JOIN db1.table1  B
            ON b.pty_key = a.pty_key
        INNER JOIN db1.table2 c
            ON b.d_key = c.d_key
        INNER JOIN db1.table3 d
            ON b.posat_key = d.posat_key
        INNER JOIN db1.table4 e
            ON b.frmly_key = e.frmly_key
        WHERE   B.date BETWEEN '2013-01-01' 
            AND '2013-12-31'
            AND b.C_ID IN ( 'abc', 'def', 'wqs')

        GROUP BY c.brnd_nm) MaxAmt
ORDER BY AMT DESC

Answer 3

您可以使用QUALIFY加上ROW_NUMBER：

SELECT 
c.brnd_nm AS BRND_NM,
SUM(b.sales_amt) AS AMT

FROM prd.client  A

INNER JOIN db1.table1  B
ON b.pty_key = a.pty_key
INNER JOIN db1.table2 c
ON b.d_key = c.d_key
INNER JOIN db1.table3 d
ON b.posat_key = d.posat_key
INNER JOIN db1.table4 e
ON b.frmly_key = e.frmly_key
WHERE   B.date BETWEEN '2013-01-01' 
    AND '2013-12-31'
    AND b.C_ID IN ( 'abc', 'def', 'wqs')

GROUP BY 1
QUALIFY
   ROW_NUMBER() 
   OVER (ORDER BY AMT DESC) = 1

如何从sum（）子查询中获取max（）量

3 个答案: