SCD 类型 2 和标识列插入错误

Question

我无法在我的数据仓库 table 中插入记录。我有一个代理键，它为每条记录自动递增 1。我收到错误消息：

An explicit value for the identity column in table 'TARGET' can only be specified when a column list is used and IDENTITY_INSERT is ON

下面的代码片段：

INSERT INTO [DW_Table] (Valid_Start_Date, Valid_End_Date, Current_Flag, Col1, Col2, Col3) 
  SELECT
   Getdate() AS Valid_Start_Date, NULL AS Valid_End_Date, 1 as Current_Flag, Col1, Col2,Col3
  FROM (
    MERGE INTO [DW_Table] AS TARGET
    USING ([Base_Table]) AS SOURCE
    ON ( SOURCEC.Account_Key = TARGET.Account_Key
         AND TARGET.Current_Flag = 1)
    WHEN MATCHED .................................

我已经尝试列出字段，因为我知道问题在于尝试将记录插入自动递增字段。我已将此作为 "USING" 基础 table 行的一部分完成，但我仍然遇到错误。

有人可以给我一些指点吗？

谢谢

Answer 1

尝试这样的事情：

use tempdb
go
drop table if exists dw_table
drop table if exists dw_table_stg 

create table DW_Table
(
  Id int identity, 
  Valid_Start_Date date, 
  Valid_End_Date date, 
  Current_Flag bit, 
  Account_Key int , 
  constraint uk_account_current unique (Account_Key, Current_Flag),
  Col1 int, 
  Col2 int, 
  Col3 int
)

insert into DW_Table (Account_Key,Col1, Col2, Col3, Current_Flag) 
       values (1,2,3,4,1),(2,2,3,4,1),(3,2,3,4,1)

go


declare @DW_Table_stg table( Account_Key int primary key, Col1 int, Col2 int, Col3 int)

insert into @DW_Table_stg (Account_Key,Col1, Col2, Col3) values (1,2,5,12)

insert into [DW_Table] 
     ( Account_Key, Valid_Start_Date, Valid_End_Date, Current_Flag, Col1, Col2, Col3) 
select Account_Key, Getdate(),        NULL,           1,            Col1, Col2, Col3
from 
(
    merge into [DW_Table] AS t
    using @DW_Table_stg AS s
    ON ( s.Account_Key = t.Account_Key )
    when matched and t.Current_Flag = 1 and checksum(s.Col1,s.Col2,s.Col3) <> checksum(t.Col1,t.Col2,t.Col3)
         then update set t.Current_flag = 0, t.Valid_End_Date = getdate()
    when not matched 
         then insert  (Valid_Start_Date, Valid_End_Date, Current_Flag,Account_Key,    Col1,   Col2,   Col3) 
         values       (getdate(),        null,           1,           s.Account_Key,s.Col1, s.Col2, s.Col3)
    output $action [ActionType], s.*
) d
where [ActionType] = 'UPDATE'

select *
from DW_Table
order by current_flag desc, Account_key

Answer 2

根据提供的代码片段，以下是您的错误消息试图做出的引用...

目标 = [DW_TABLE]
列 = (Valid_Start_Date, Valid_End_Date, Current_Flag, Col1, Col2, Col3)

这意味着 DW_TABLE 中列出的列之一被定义为 IDENTITY KEY，因此您的 INSERT 语句不应为其指定值。

您能否分享 DW_TABLE 的完整合并查询和列定义？

此外，连接键显示 "SOURCEC" 而不是 "SOURCE"。这只是一个错字吗？

SCD 类型 2 和标识列插入错误

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