在選擇子查詢中使用「分組依據」

Question

下面是我創建的查詢，但在生成結果驗證後，查詢產生的結果不準確。

select a.acct_id, c.bill_dt 
from account a inner join invoice_detail b on a.acct_id = b.acct_id 
inner join 
    (select acct_id, max(bill_dt) as bill_dt from invoice_detail 
    where bill_dt < '1/1/2014' 
    group by acct_id)c on b.acct_id = c.acct_id 
and a.acct_stat_id = '275' 
and not a.acct_id in (select acct_id from contract where cntrct_stat_id in ('394','554','555','556')) 
and not a.acct_id in (select acct_id from billing_adj where bill_adj_stat_id in ('4','394','553','554','555')) 
group by a.acct_id, c.bill_dt 
order by a.acct_id ASC 

我希望我的結果在滿足所有查詢條件後僅顯示acct_ids和max（bill_dt）。 invoice_detail表包含acct_id的多個記錄。但是，當我執行查詢時，我隨機選擇了一個最大（bill_dt）爲12/31/2013的acct_id進行驗證。我用acct_id查找了invoice_detail表，結果返回了一條bill_dt大於1/1/2014的附加記錄。我想確定2014年1月1日後沒有任何發票的acct_id。

Answer 1

我想2014年1月1日

然後你在你的子查詢條件必須是後確定沒有任何發票acct_ids：

HAVING max(bill_dt) < '1/1/2014' 

你也除子查詢外，不使用invoice_detail表，因此您可以將其從主查詢中取出：

select a.acct_id, c.bill_dt 
from account a 
inner join 
    (select acct_id, max(bill_dt) as bill_dt from invoice_detail 
     group by acct_id 
     HAVING max(bill_dt) < '1/1/2014' 
    ) c on a.acct_id = c.acct_id 
and a.acct_stat_id = '275' 
and not a.acct_id in (select acct_id from contract where cntrct_stat_id in ('394','554','555','556')) 
and not a.acct_id in (select acct_id from billing_adj where bill_adj_stat_id in ('4','394','553','554','555')) 
group by a.acct_id, c.bill_dt 
order by a.acct_id ASC