合併幾乎重複的記錄在SQL

Question

問候所有...

我有兩個表，其結構是相同的......

表設置logdetail

Date    Time   CardID  Status 
2012-01-20  00:00:00  A1   ABSENT 
2012-01-20  00:00:00  B1   ABSENT 
2012-01-20  00:00:00  C3   ABSENT 
2012-01-20  00:00:00  D1   ABSENT 

表preStatus

Date   Time  CardID  Status 
2012-01-20  07:00:10  A1   COMING 
2012-01-20  07:10:00  C3   COMING 
2012-01-20  08:00:00  B1   LATE 
2012-01-20  17:00:00  B1   BACK 
2012-01-20  17:10:10  A1   BACK 
2012-01-20  17:13:00  C3   BACK 

合併後

Date 
2012-01-20  07:00:10  A1   COMING 
2012-01-20  07:10:00  C3   COMING 
2012-01-20  08:00:00  B1   LATE 
2012-01-20  00:00:00  D1   ABSENT 
2012-01-20  17:00:00  B1   BACK 
2012-01-20  17:10:10  A1   BACK 
2012-01-20  17:13:00  C3   BACK 

請問有什麼可以，因爲在表合併這兩個表B有重複的記錄，當我做 合併...

merge into logDetail as Target 
using preStatus as Source 
on Target.L_Date=Source.L_Date 
and Target.L_Time='00:00:00' 
and Target.L_CardID=Source.L_CardID 
when matched then 

update set Target.L_Status=Source.L_Status, 
Target.L_Time=Source.L_Time 
when not matched then 
insert (L_Date,L_Time,L_CardID,L_Status) 
          values(Source.L_Date,Source.L_Time,Source.L_CardID,Source.L_Status); 

它說MERGE語句試圖更新或刪除同一行更比一次

任何幫助，非常感謝。

Answer 1

您似乎不想合併這些表，因爲CardID不是主鍵。

即使有新的條目，其中stats =「BACK」，您仍然希望保留Status =「COMING」的條目。

我建議你分兩步做，首先插入preStatus數據，然後刪除存在「COMING」和「BACK」行的「ABSENT」行。

/* Insert new data */ 
insert logDetail 
select * from preStatus 

/* Delete Absent rows where there is a COMING or BACK row for the same item on the same day */ 
Delete logDetail 
from logDetail ld1 
where 
    /* Absent rows only */ 
    ld1.time = '00:00:00' 
and ld1.Status = 'ABSENT' 
/* And there must be a COMING or BACK row for the same card on the same day */ 
and exists (
    select 1 from logDetail ld2 
    where ld2.Date = ld1.Date 
    and ld2.CardID = ld1.CardID 
    and ld2.Time > '00:00:00' 
    and ld2.Status <> 'ABSENT' 
) 

爲同一日期，CardId中，而同樣的狀態刪除行，但那裏是一個後來時間：

Delete logDetail 
from logDetail ld1 
where 
ld1.status in ('COMING', 'BACK') 
/* COMING or BACK row only */ 
     /* for the same card on the same day, with a later time*/ 
and exists (
    select 1 from logDetail ld2 
    where ld2.Date = ld1.Date  
    and ld2.CardID = ld1.CardID 
    and ld2.Status = ld1.Status 
    and ld2.Time > ld1.Time 
) 

Answer 2

匹配時不要做任何事情，這應該解決它？