T-SQL语句的拼接后，查询结果集

DECLARE @Sql NVARCHAR(MAX),@ReceiveID NVARCHAR(50)
 
 SET @ReceiveID = ' WHERE AreaID = 11'
 SET @Sql = 'SELECT * FROM dbo.Area_Info'
  
 IF (ISNULL(@ReceiveID, '') <> '')
 BEGIN
  SET @Sql = @Sql +@ReceiveID
 END
 --PRINT @Sql
 EXEC (@Sql)