仅删除SQL Server上的一条记录

如何解决仅删除SQL Server上的一条记录

| 假定在sql Server上有一个表

EMPLOYEE

带有列

ID (int),Name (nvarchar),Surname(nvarchar)

。 这就是您所知道的。您无法在表格内看到数据。 您被命令仅删除名称为\'Alice \'的记录之一。 您将如何编写适当的查询？     

解决方法

DELETE TOP (1)
FROM EMPLOYEE 
WHERE Name=\'Alice\'

    ,

DELETE TOP (1) FROM EMPLOYEE WHERE Name = \'Alice\'

    ,在SQL Server中：

DELETE TOP 1 FROM EMPLOYEE WHERE Name = \'Alice\'

    ,此处建议的所有答案基本上都是相似的，就您介绍问题而言，它们都是最佳的。 但这将迫使您的代码删除Name = \'Alice \'的第一条记录。但是，如果您需要一点点额外的力量来选择要删除的\'Alice \'（如果表中有多个）。但是ID必须是

Primary Key

或

Unique

SELECT FROM EMPLOYEE ID,Surname WHERE Name = \'Alice\'

这将显示结果，然后您可以获取要删除的目标记录的ID并将其放在以下查询中（假设您要删除的记录的ID为56）

DELETE FROM EMPLOYEE  WHERE ID = 56

    ,

declare @Holder table ( EmployeeKey int,Name varchar(24),Surname varchar(24) )


Insert into @Holder ( EmployeeKey,Name,Surname )
            select 201,\'Alice\',\'Smith\'
union all   select 102,\'Mary\',\'Smith\'
union all   select 203,\'Henderson\'
union all   select 104,\'John\',\'Smith\'
union all   select 105,\'Paul\',\'Johnson\'
union all   select 206,\'Jones\'

Delete @Holder
/*  Select * ............. while debugging,you can remove the \'Delete @Holder\' and put in a \'Select *\' to see the results (of what ~will be deleted) */
From 
@Holder h
join 
(select top 1 EmployeeKey from @Holder innerH where Name = \'Alice\' /* order by EmployeeKey DESC */ ) as derived1
 on h.EmployeeKey = derived1.EmployeeKey

select * from @Holder order by Name,EmployeeKey

/*
order by EmployeeKey DESC is optional,aka,if you want to \"prefer\" which one gets popped for delete,you can tweak it as needed
*/