仅显示count（*）＆gt;行2000使用sqldf

Question

我正在尝试使用下面的代码选择除前2000行之外的所有行，但是我收到以下错误。

new_table = sqldf("select units, count(*)
                   from old_table
                   group by units
                   where count(*) > 2000")
Error in sqliteExecStatement(con, statement, bind.data) : 
  RS-DBI driver: (error in statement: near "where": syntax error)

Answer 1

我认为你只是在寻找HAVING：

select units, count(*)
from old_table
group by units
having count(*) > 2000

• Condensed SQL Fiddle Demo

Answer 2

任何引用当前查询中创建的值的where语句都需要嵌入子查询中。

相反，您可以使用：

select * from 
(
select units, count(*) as count
from old_table
group by units
)
where count > 2000