Question

如果该表中的数据不存在，我正在从表中选择数据并将其插入到另一个表中。

DECLARE @EmployeeNumber NVARCHAR(100)
SET @EmployeeNumber = 'Emp001'
IF EXISTS(SELECT E.EmployeeNumber FROM [databaseOne].[dbo].[Employee] E WHERE E.EmployeeNumber =    @EmployeeNumber)
BEGIN
IF NOT EXISTS(SELECT UT.EmployeeNumber FROM UserTable UT WHERE UT.EmployeeNumber = @EmployeeNumber)
BEGIN
    INSERT INTO UserTable(EmployeeNumber, Surname)
    SELECT E.EmployeeNumber, E.Surname FROM [databaseOne].[dbo].[Employee] E
    WHERE E.EmployeeNumber = @EmployeeNumber
END
ELSE
  BEGIN
      --Update
  END
END

如果数据确实存在，我只想更新现有数据。

如何更新而不是INSERT INTO。

亲切的问候

Answer 1

您应该使用Merge功能。

您的查询看起来有点像这样：

MERGE UserTable AS Target
USING (SELECT E.EmployeeNumber, E.Surname FROM [databaseOne].[dbo].[Employee] E 
       WHERE EmployeeNumber = @EmployeeNumber) AS Source
ON Target.EmployeeNumber = Source.EmployeeNumber
WHEN MATHCED THEN 
     UPDATE SET Target.Surname = Source.Surname
WHEN NOT MATCHED THEN 
     INSERT (EmployeeNumber, Surname) VALUES (Source.EmployeeNumber,Source.Surname);

参考here。

Answer 2

尝试以下方面的内容：

UPDATE UserTable
SET
EmployeeNumber=E.EmployeeNumber
Surname=E.Surname
FROM UserTable
INNER JOIN [databaseOne].[dbo].[Employee] AS E
ON (E.EmployeeNumber = UserTable.EmployeeNumber )
WHERE UserTable.EmployeeNumber = @EmployeeNumber

更新表而不是Insert Into

2 个答案: