sql服务器: How to use an aggregate function like MAX in a WHERE clause

Question

我想获得该记录的最大值。请帮助我:

SELECT rest.field1 
    FROM mastertable AS m
    INNER JOIN  (
        SELECT t1.field1 field1, 
               t2.field2
            FROM table1 AS T1 
            INNER JOIN table2 AS t2 ON t2.field = t1.field 
            WHERE t1.field3=MAX(t1.field3)
        --                  ^^^^^^^^^^^^^^  Help me here.
    ) AS rest ON rest.field1 = m.field

Answer 1

正如您所注意到的，WHERE 子句不允许您在其中使用聚合。这就是 HAVING 子句的用途。

HAVING t1.field3=MAX(t1.field3)