如何计算不同的字段并在where语句中调用它？

Question

我试图计算表格上出现的重复数量,例如:

First| Last  | ADDR1           | City      | ST | Zip
-----+-------+-----------------+-----------+----+------
John | Smith | 1234 Fake St.   | Hollywood | CA | 12345
John | Smith | 1234 Fake St.   | Hollywood | CA | 12345
John | Smith | 1234 Fake St.   | Hollywood | CA | 12345
John | Smith | 1234 Fake St.   | Hollywood | CA | 12345
Jane | Smith | 1111 Junkertown | Phoenix   | AR | 22222
Jane | Smith | 1111 Junkertown | Phoenix   | AR | 22222
Jane | Smith | 1111 Junkertown | Phoenix   | AR | 22222

这是我的select语句,但它不喜欢我的where语句.我只想返回计数> 1的行

select distinct t.first_name, t.last_name, t.addr_line_1, t.city, 
                t.state_cd, t.zip, count(*) as numberofdupes
from name_addr t
where numberofdupes > 1
group by t.first_name, t.last_name, t.addr_line_1, t.city, t.state_cd, t.zip

如果有人能指出我正确的方向.谢谢,麻烦您了.

Answer 1

跳过该WHERE子句,HAVING用于聚合函数条件.

没必要SELECT DISTINCT,GROUP BY返回没有重复的行.

select t.first_name, t.last_name, t.addr_line_1, t.city, 
       t.state_cd, t.zip, count(*) as numberofdupes
from name_addr t
group by t.first_name, t.last_name, t.addr_line_1, t.city, t.state_cd, t.zip
having count(*) > 1