IF OBJECT_ID('[dbo].[Employee]') IS NOT NULL
    DROP TABLE [dbo].[Employee]
 
CREATE TABLE [dbo].[Employee]
(
    [FirstName] NVARCHAR(40),
    [LastName] NVARCHAR(40)
)
GO
INSERT INTO [dbo].[Employee] ([FirstName],[LastName]) VALUES (N'张',N'三'),(N'李',N'四'),(N'黄',N'五')
SELECT [FirstName],[LastName] FROM [dbo].[Employee] WHERE ([FirstName] + [LastName]) = N'李四'