Sql 有计数子查询

我试图得到一些查询，但我有我的计数问题，它说我缺少一个表达式，请帮助

select d.kode, rpad(d.nama,75,' ') as "NAMA", lpad(count(th.fk_distributor),10,' ') as "JUMLAH"
from mh_distributor d 
join th_beli th on th.fk_distributor = d.kode
having count(td.fk_produk) > select avg("JUMLAH") as "AVERAGE" from(
    select d.nama,count(th.fk_distributor) as "JUMLAH"
    from mh_distributor d
    join th_beli th on th.fk_distributor = d.kode
    group by d.nama
)
group by d.nama, td.fk_produk, d.kode
order by d.kode asc;

---

这就是我的查询

只需将第二条

选择

语句与子查询打包即可：

select avg("JUMLAH") 
from(select d.nama,count(th.fk_distributor) as "JUMLAH"
     from mh_distributor d join 
          th_beli th on th.fk_distributor = d.kode
     group by d.nama
    ) t;

因此，您的完整声明如下：

select d.kode, rpad(d.nama,75,' ') as "NAMA", 
      lpad(count(th.fk_distributor),10,' ') as "JUMLAH"
from mh_distributor d join 
     th_beli th 
     on th.fk_distributor = d.kode
having count(td.fk_produk) > (select avg("JUMLAH") 
                              from(select d.nama,count(th.fk_distributor) as "JUMLAH"
                                   from mh_distributor d join 
                                        th_beli th on th.fk_distributor = d.kode
                                   group by d.nama
                                 ) t
                             )
group by d.nama, td.fk_produk, d.kode
order by d.kode asc;

使用窗口功能

select nk.*
from (select d.kode, d.nama, count(*) as jumlah,
             avg(count(*)) over (partition by d.nama) as avg_jumlah
      from mh_distributor d join
           th_beli th
           on th.fk_distributor = d.kode
      group by d.nama, td.fk_produk, d.kode
     ) nk
where jumlah > avg_jumlah;

我省略了对字符串的转换，因为我认为这只会使逻辑更难遵循——当然，将其添加回特定用例的外部查询中

---

这应该比复杂的

having

子句有更好的性能。

我的select平均值及其子查询工作正常，但它说我在having count行中缺少了一个表达式hello！你能加上你面临的错误吗？我想知道答案，但它和我在上面写的一样，所以这就是你的意思