解决 SQL 不能正确显示中文问题

use DataBaseName
go
if not OBJECT_ID('[Employees]') is Null
   Drop Table [Employees]
go
Create Table [Employees]
(ID int Primary Key Identity(1,1),
 [Name] Nvarchar(50) Not Null,
 [Title] Nvarchar(50) Null,
 [Phone] int Null,
 [City] Nvarchar(20))
 go
 Insert Into [Employees] 
 select '张三', '采购经理', 1234567, '北京'
 Union All
 select '李四', '销售', 7654321, '上海'
 Union All
 select '王小', '前台', 1230000, '上海'

 select * from [Employees] where [City] = '上海'

结果显示:

 不改变排序规则和字段类型，加 N 解决：

use DataBaseName
go
if not OBJECT_ID('[Employees]') is Null
   Drop Table [Employees]
go
Create Table [Employees]
(ID int Primary Key Identity(1,1),
 [Name] Nvarchar(50) Not Null,
 [Title] Nvarchar(50) Null,
 [Phone] int Null,
 [City] Nvarchar(20))
 go
 Insert Into [Employees] 
 select N'张三', N'采购经理', 1234567, N'北京'
 Union All
 select N'李四', N'销售', 7654321, N'上海'
 Union All
 select N'王小', N'前台', 1230000, N'上海'

 select * from [Employees] where [City] = N'上海'

结果显示：