如何查詢匹配兩個不同表中的記錄，如果匹配更新爲新值，則不匹配會提示我填寫詳細信息？

Question

我有兩個表

+---------------------------------+ 
|    Table A    | 
+----------+-----------+----+-----+ 
| Part No | Serial No | PO | DO | 
+----------+-----------+----+-----+ 
| 1AB1009 | GR7764 | ST | OND | 
| 1AB1009 | GR7765 | ST | OND | 
+----------+-----------+----+-----+ 

+-----------+ 
| Table B | 
+-----------+ 
| Serial No | 
+-----------+ 
| GR7764 | 
| GR7765 | 
+-----------+ 

表B具有獨特的序列號的只有一列，是匹配兩個表中的序列號和更新的值，如果有匹配......我的查詢運行不錯這但我有一個情景喜歡第一我上傳一個csv文件到表B，然後我會匹配...但表A可能沒有一些序列號，所以如果沒有匹配，它應該提示我去添加頁面添加記錄到表A，然後執行更新查詢。

這是我的查詢

update TableA 
    set Mat_No ='"+ Mat_No+"',WO_No='"+WO_No+"',Code = '"+Code+"', 
     Desc = '"+Desc+"',Center='"+Center+"',Date='"+Date+"',Remarks='"+Remarks+"' 
where SerialNo in(select A.SerialNo 
        from Table A, Table B 
        where B.SerialNo = A.SerialNo and A.Status = 'IN'); 

首先，我要上傳CSV文件表B，然後我填補像MATNO等所有的細節，然後更新如果CSV文件是具有序列號不屬於表那麼它應該提示我所有的序列號在表A中都不匹配......不知道該怎麼做？請幫我...

Answer 1

下面是步驟，你可以這樣做：

裝入的CSV文件（使用任何BCP，BULK INSERT，導入導出嚮導，SSIS包）裝載tableB的。該過程獨立於更新tableA。

現在爲TableA創建一個更新觸發器，用於檢查B中存在的所有SNO，並在更新時檢查A中的NOT。請參閱下面的DDL和查詢爲例，並相應修改：

    create table TABLEA (
    PartNo varchar(30), 
    SNo varchar(30), 
    PO varchar(10), 
    DO varchar(30)) 

    insert into TABLEA 
    select '1AB1009', 'GR7764', 'ST', 'OND' 
    union 
    select '1AB1009','GR7765','ST','OND' 

    create table TABLEB ( 
    SNo varchar(30) 
    ) 
    insert into TABLEB 
    select 'GR7764' 
    union 
    select 'GR7765' 

    select * from TABLEA 
    select * from TABLEB 
    GO 

現在創建的，而不是TableA上更新觸發警告SNOS試圖從前端應用程序插入時缺少表A

    CREATE TRIGGER missingSNOs ON TABLEA 
    INSTEAD OF UPDATE 
    AS 

     BEGIN 
      if EXISTS (SELECT 1 
          FROM TABLEB B 
          LEFT OUTER JOIN 
          INSERTED I 
          ON B.SNO = I.SNO 
          WHERE I.SNO IS NULL 
          ) 
      begin 
        SELECT B.SNO 
          FROM TABLEB B 
          LEFT OUTER JOIN 
          INSERTED I 
          ON B.SNO = I.SNO 
          WHERE I.SNO IS NULL 
       RAISERROR('S.nos are missing in tableA which are present in tableB',16,1); 
       ROLLBACK; 
      end  
     END 
    GO 

如果測試觸發器觸發時，斯諾缺少

-- Errors with message as the SNO is missing 
update TABLEA 
set PartNo = 'newPartNo' 
where SNO = 'SnoNOTinB' 

-- works no errors as both SNOS are present in tableB 
update TABLEA 
set PartNo = 'new one' 
where SNO in ('GR7764', 'GR7765') 

-- Also you dont have to join with tableB now and modify query as below 
UPDATE A 
set A.Mat_No ='"+ Mat_No+"',WO_No='"+WO_No+"', 
Code = '"+Code+"',Desc = '"+Desc+"', 
Center='"+Center+"', 
Date='"+Date+"', 
Remarks='"+Remarks+"' 
FROM TableA A     
WHERE A.Status = 'IN' 

最後清理代碼

    drop table TABLEA 
     drop table TABLEB