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我有这个疑问,2列规定,但它不工作没有列名在“t”
select t.ACCOUNT_ID
from
(select
a.ACCOUNT_ID, count(a.ACCOUNT_ID)
from
EMPLOYER a, EMPLOYER b
where
a.main_id = b.main_id
group by
a.MAIN_ID, a.account_id
having
count(a.account_id) > 1) t
我试图找到重复,想从 子查询获取的唯一ACCOUNT_ID
[不良习惯踢:使用旧样式的JOIN(http://sqlblog.com/blogs/aaron_bertrand/archive/2009/10/08/bad-habits-to- kick-using-old-style-joins.aspx) - 在ANSI - ** 92 ** SQL标准中,旧式*表格样式的旧式*逗号分隔列表已替换为* proper * ANSI'JOIN'语法** 25年前**),其使用是不鼓励的 –