比较两个SQL表（完全相同的列）添加缺少的行

Question

我有两个完全相同的格式的表。 我想将这两个表相互比较，如果表A没有表B的记录，那么我想将该列添加到表A。如何使用SQL来实现这一点。 我只想比较以下列中的表CompanyNumber，EmployeeNumber，StatusFlag和Initials。

使用SQL的最佳方法是什么？

这个查询有什么问题？

MERGE EmployeeMaster AS Dest
USING ( SELECT * FROM EmployeeMasterCopy ) AS Src
JOIN  Dest.CompanyNumber = Src.CompanyNumber
and Dest.EmployeeNumber = Src.EmployeeNumber
and Dest.StatusFlag = Src.StatusFlag
and Dest.Initials = Src.Initials
WHEN NOT MATCHED THEN

   INSERT INTO EmployeeMaster(CompanyNumber, FirstName, LastName, FullName, Branch, DepartmentNumber, Initials, 
                                    JobTitle, StartDate, EmployeeNumber, EmployeeType,
                                    PayType, Rate, UnionNo, G2ID, EnterTimeFl, StatusFlag, CreateBy, CreateDate, MiddleName,ManagerEmpNo, NextReviewDate, UserName, TempFl, PrimaryDivision,PEWFl,PGTFl,PMPFl,PPGEFl,PPGFl,PRCFl,PTCFl,PPFl,SWPFl,ReviewPeriod, CorpFl, NickName, RateEffectiveDate, VacationBalance, SickBalance, TempEmployeeType, BusinessSegment)
        VALUES (Src.CompanyNumber, Src.FirstName, Src.LastName,Src.LastName + ', ' + Src.FirstName, Src.Branch, Src.DeptNo, upper(Src.Initials), Src.JobTitle, Src.StartDate, Src.EmployeeNumber,
                Src.EmployeeType, Src.PayType, Src.Rate, Src.UnionNo, Src.G2ID, Src.EnterTimeFl, 1, 'AJOHNSON', GETDATE(), Src.MiddleName, Src.ManagerEmpNo, Src.NextReviewDate, Src.UserName, Src.TempFl, Src.PrimaryDivision,Src.PEWFl,Src.PGTFl,Src.PMPFl,Src.PPGEFl,Src.PPGFl,Src.PRCFl,Src.PTCFl,Src.PPFl,Src.SWPFl,Src.ReviewPeriod, Src).CorpFl, Src.NickName,Src.RateEffectiveDate ,
    Src.VacationBalance ,
    Src.SickBalance ,
    Src.TempEmployeeType, Src.BusinessSegment

错误如下：

 Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'as'.
Msg 156, Level 15, State 1, Line 3
Incorrect syntax near the keyword 'AS'.
Msg 128, Level 15, State 1, Line 13
The name "Src.CompanyNumber" is not permitted in this context. Valid expressions are constants, constant expressions, and (in some contexts) variables. Column names are not permitted.

Answer 1

您可以使用MERGE

MERGE TableA as Dest
USING ( select * from TableB ) as Src
ON Dest.CompanyNumber = Source.companyNumber
and Dest.EmployeeNumber = Source.EMployeeNumber
and Dest.StatusFlag = Source.StatusFlag
and Dest.initials = Source.initials
WHEN NOT MATCHED then
   INSERT (CompanyNumber, EmployeeNumber, StatusFlag, initials, ...)
  values ( Src.CompanyNumber, Src.EmployeeNumber, Src.StatusFlag, Src.initials....)

Answer 2

认为一个简单的方法可能是：

select
   TableA.CompanyNumber as "Tab A Company No",
   TableB.CompanyNumber as "Tab B Company No",
   TableA.EmployeeNumber as "Tab A Employee No",
   TableB.EmployeeNumber as "Tab B Employee No",
   TableA.StatusFlag as "Tab A Status Flag",
   TableB.StatusFlag as "Tab B Status Flag",
   TableA.Initials as "Tab A Initials",
   TableB.Initials as "Tab B Initials",
from
   TableA,
   TableB