选择另一列的最大数量

Question

我正在编写一个简单的查询来获取具有MAX ADDRESS_SEQ_NUM的VENDOR_ID，以便我得到以下输出：

VENDOR_ID     ADDRESS_SEQ_NUM
76109A        81

问题是，当我编写以下SQL时，我回到每个VENDOR_ID并且它自己的最大ADDRESS_SEQ_NUM，而我只需要整个表中的VENDOR_ID和max ADDRESS_SEQ_NUM。

SELECT VENDOR_ID, MAX(ADDRESS_SEQ_NUM)
FROM PS_VNDR_ADDR_SCROL
GROUP BY VENDOR_ID

Answer 1

ORDER BY ADDRESS_SEQ_NUM下降。使用TOP 1仅获取第一行，即具有最高ADDRESS_SEQ_NUM值的行。

SELECT TOP 1 VENDOR_ID, ADDRESS_SEQ_NUM
FROM PS_VNDR_ADDR_SCROL
ORDER BY ADDRESS_SEQ_NUM DESC;

Answer 2

你必须做一个subselect

SELECT VENDOR_ID, ADDRESS_SEQ_NUM
FROM PS_VNDR_ADDR_SCROL
WHERE ADDRESS_SEQ_NUM = (SELECT MAX(ADDRESS_SEQ_NUM)
                         FROM PS_VNDR_ADDR_SCROL)