SQL組的問題，當我嘗試獲取一些信息

Question

我無法弄清楚： 我有一個表稱爲與市場，zip5，MHI，MHV，TheTable等字段ImportantaRecords我想通過zip5組合所有記錄已經TheTable =「毫克」 ......我想這：

select a.Market,a.zip5,count(a.zip5),a.MHI,a.MHV,a.TheTable from 
    (select * from ImportantaRecords where TheTable = 'mg') a 
    group by a.Zip5 

但它給我的經典誤差不是aggrefate功能

，然後我嘗試這樣做：

select Market,zip5,count(zip5),MHI,MHV,TheTable from ImportantaRecords where TheTable = 'mg' 
    group by Zip5 

和同樣的東西...

任何幫助嗎？

Answer 1

您沒有說明您所使用的數據庫，但如果你得到關於在聚合函數不是列的錯誤，那麼你可能需要未在聚合函數添加列到GROUP BY：

select Market, 
    zip5, 
    count(zip5), 
    MHI, 
    MHV, 
    TheTable 
from ImportantaRecords 
where TheTable = 'mg' 
group by Market, Zip5, MHI, MHV, TheTable; 

如果由其他列編組改變，你期待，那麼你可以使用子查詢得到結果的結果：

select i1.Market, 
    i1.zip5, 
    i2.Total, 
    i1.MHI, 
    i1.MHV, 
    i1.TheTable 
from ImportantaRecords i1 
inner join 
(
    select zip5, count(*) Total 
    from ImportantaRecords 
    where TheTable = 'mg' 
    group by zip5 
) i2 
    on i1.zip5 = i2.zip5 
where i1.TheTable = 'mg'