sqlserver uses WITH AS to implement recursion, which is often used in tree structures (such as organizational structure, role permissions)

   Meaning of WITH AS

    The WITH AS phrase, also known as subquery factoring, allows you to do many things, define a SQL fragment that will
be used by the entire SQL statement. Sometimes, it is to make the SQL statement more readable, or it may be in a different part of the UNION ALL, as the part that provides the
data  .
    Especially useful for UNION ALL. Because each part of UNION ALL may be the same, but if each part is executed once, the cost is too high,
so you can use the WITH AS phrase, and only need to execute it once. If the table name defined by the WITH AS phrase is called more than twice, the optimizer will automatically put
the data obtained by the WITH AS phrase into a TEMP table, if it is called only once, it will not. The prompt materialize is to force
the data in the WITH AS phrase into a global temporary table. Many queries can be speeded up this way.

 

    The second application scenario mentioned above is described in detail below:

1. Create an enterprise employee table, and the table database design is as follows:
   
   Press Ctrl+C to copy the code

   CREATE TABLE [dbo].[Employee](
       [ID] [uniqueidentifier] NOT NULL,--用户ID
       [EnterpriseCode] [uniqueidentifier] NOT NULL,--企业标识
       [ParentGUID] [uniqueidentifier] NOT NULL,--上级ID
       [ECode] [nvarchar](50) NOT NULL,--员工编号
       [EName] [nvarchar](200) NOT NULL--员工名称
    CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED 
   (
       [ID] ASC
   )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
   ) ON [PRIMARY]
   
   
   GO
2. Insert the initial data as follows
   
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'5b82d74d-c5c7-4cbb-af28-0518bdc257d9', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'00000000-0000-0000-0000-000000000000', N'SG0012', N'张志军')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'0cd19311-2ca1-4120-9554-11bfd8219af9', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'5b82d74d-c5c7-4cbb-af28-0518bdc257d9', N'KP10035', N'杜高扬')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'dd994fda-1703-4616-af1b-165164df710e', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'5b82d74d-c5c7-4cbb-af28-0518bdc257d9', N'SG0005', N'Zhao Bin')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'ef7c0c60-2545-4c5a-baa6-1a0eec3557b3', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'5b82d74d-c5c7-4cbb-af28-0518bdc257d9', N'KP10029', N'屠玉韵')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'557c113a-786a-4dbc-9eb6-1aa80cfd9e68', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'5b82d74d-c5c7-4cbb-af28-0518bdc257d9', N'0119', N'陈佳楠')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'80012614-b153-4bc6-b5da-0db244cccf9b', N'SG0001', N'Zhang Zhongrong')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'5c8214ec-258b-4c44-9f31-206e499f0285', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0cd19311-2ca1-4120-9554-11bfd8219af9', N'0129', N'孙跃光')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'df5d082c-baa3-4315-b234-209b50c37e7a', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0cd19311-2ca1-4120-9554-11bfd8219af9', N'0109', N'姚宇')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'5d68e6c2-6e7e-4608-8cd2-234557fcacef', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0cd19311-2ca1-4120-9554-11bfd8219af9', N'KP10040', N'He Yarou')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'9627fdcf-affa-424b-b1ca-24538b101986', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0cd19311-2ca1-4120-9554-11bfd8219af9', N'0120', N'简婧晖')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'6eccd0ec-11ad-45e3-98b6-2457cf61da2e', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'dd994fda-1703-4616-af1b-165164df710e', N'KP10027', N'苗英叡')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'1416b56c-d54a-41eb-83c2-25573cb25f4b', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'dd994fda-1703-4616-af1b-165164df710e', N'KP10013', N'Chai Tianyuan')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'868030db-7f25-4bc0-8ff7-259759426250', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'dd994fda-1703-4616-af1b-165164df710e', N'0114', N'师萱倩')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'a81a9114-b7c9-41b6-818e-2a418e3dd14d', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'dd994fda-1703-4616-af1b-165164df710e', N'0125', N'张怀宝')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'166fa95a-0425-40e3-8cb9-2a4c97ca4cc6', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'ef7c0c60-2545-4c5a-baa6-1a0eec3557b3', N'KP10025', N'Shao Lejia')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'6e94aa52-700a-4415-bb8a-34345605e13d', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'ef7c0c60-2545-4c5a-baa6-1a0eec3557b3', N'SG0011', N'李恒钓')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'c5e537d4-0994-43e2-a1ab-3f736b4e22d3', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'ef7c0c60-2545-4c5a-baa6-1a0eec3557b3', N'KP10015', N'龚高朗')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'61f79eaf-db86-425e-a61c-4228265eec28', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'ef7c0c60-2545-4c5a-baa6-1a0eec3557b3', N'KP10038', N'Bu Wanhui')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'34c26725-3726-4c45-90c0-440c91ef34b8', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'ef7c0c60-2545-4c5a-baa6-1a0eec3557b3', N'0105', N'苏晓会')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'3d09264c-5a0d-46fd-b924-443585ad61bc', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'557c113a-786a-4dbc-9eb6-1aa80cfd9e68', N'KP10026', N'夏成龙')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'30b558f3-be74-4127-b91f-444e858ef9ff', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'557c113a-786a-4dbc-9eb6-1aa80cfd9e68', N'KP10004', N'Ma Yi')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'4b1d5979-1ef7-4927-9b6b-44f151d2d803', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'557c113a-786a-4dbc-9eb6-1aa80cfd9e68', N'0110', N'刘文强')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'0107', N'徐连翔')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'ee09d65c-8780-4736-b636-4d9335bfdd80', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'KP10028', N'Silver Tree')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'94e3071a-6b00-4f53-9dd0-4fe0fc9bef51', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'0126', N'赵硕')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'123580a5-25c7-4315-b75b-584e86fe945e', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'KP10018', N'刁意智')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'119d1cd2-c8af-4a7e-a1be-5eed11011e09', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'KP10033', N'Jin Jitong')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'c7da19df-a45b-4441-9c0e-5f216f5b1950', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'KP10006', N'乌奇逸')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'07912b56-dd54-44f2-b251-61d1e0537c7f', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'0112', N'汪素萍')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'bc9ac28d-010b-45bc-b10b-63998c97c058', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'KP10014', N'Gu Chengyan')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'df2d222f-e009-4fa9-b0e4-63c81f4c9976', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'c5b58ce6-96b7-496d-bceb-1e7c659badbd', N'0106', N'郝晓妍')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'34569802-4a83-4851-86cb-678b254850ba', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10031', N'朱自怡')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'a4129729-a96f-44e1-908e-6a2c4e7ba5fa', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0128', N'Yao Linshu')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'd37c7008-c98d-4374-b153-6cc93e1a39ce', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0102', N'刘倩')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0122', N'刘广斗')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'c8cf644a-af3f-427b-b7f8-6dc79170259e', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10034', N'Fangwen Building')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'e28d744e-c22f-4fce-9155-6f79d8b426dc', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'SG0013', N'赵斌 ')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'a28b560a-6069-48b8-bb0c-718154b35d42', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0117', N'刘好')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'38998b88-0425-466c-9197-73a731bed720', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10003', N'Ba Yuanliang')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'c2de93d0-44d9-4fff-b4aa-74872f315df6', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0115', N'续非')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'2159a71e-c7d5-4a6d-8719-7971834a6a17', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0104', N'庄泽雨')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'c439c6bf-45fe-4274-9a89-7a650d9500ba', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'SG0010', N'Zhang Yachun')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'd85ba73e-9095-4f1d-b58d-7c02a5396bea', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10011', N'卜飞羽')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'ddf77f91-23fd-48b9-b114-7ef96b6af839', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'SG0002', N'张仲礼')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'b462147f-b47f-46b8-86f4-8042911d25aa', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0103', N'Mao Jing')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'194b51e7-285f-4e3b-b723-8b2a568030e1', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10022', N'颉高懿')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'f02647c7-e8c7-4f7b-b007-8dd86e679f27', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10010', N'樊振国')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'fcd56ee6-6658-4337-bda4-98b0e2c5bced', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10016', N'Liu Deyun')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'a949e892-f1a8-4cfc-8aa7-98cfb33a8607', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'SG0006', N'赵芳 ')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'6c20a6f8-f629-4d09-9c66-99c8ec19b9ee', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10036', N'聂思博')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'16b69138-c66a-4ff4-b770-9a239f51403a', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'KP10008', N'Lin Liqiang')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'fde7c22c-b6e9-43e5-93c0-a0f548a8fe28', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'SG0003', N'张宗敏')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'a4c474a4-d885-4ecd-970e-a131abd459fc', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'bdc8cbdc-3511-41dc-899c-4b61969ff65c', N'0118', N'刘晋杰')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'309b57d7-8db3-4f06-bd2d-a33cdae8a2b2', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10005', N'Wen Chenglong')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'f9ee4009-aa1f-4382-be0c-a40ebe77d91f', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10020', N'干新霁')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'ee7f3171-e7e7-468a-9a97-a47367fa62f9', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10032', N'邝和泽')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'54c86d68-4d75-42d4-8687-aa60148408b0', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'0127', N'Zhang Li')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'7d7c0c91-b4d2-45b0-820e-ab36303976d7', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10017', N'攀弘毅')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'513f792c-4e49-4d5b-8d27-acff8c39cf3c', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10002', N'邸英武')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'f8e70a5b-075b-4485-a56c-af7e1e3caffe', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10001', N'Joe Tae Ho')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'cf1ebf4f-eeda-4681-91f5-c24864b791ab', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10019', N'言意致')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'7c8d67fc-9f69-4fb9-a6df-c9ad7a24dd8b', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10012', N'沿成礼')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'f7a2bd1d-e7ed-418b-8366-ca749d2a4f71', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10009', N'Cha Taining')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'14291e5f-0ab7-433a-88b7-ccd860658e38', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10024', N'国和悦')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'dd0bde40-5f56-48de-992b-ce92689421b9', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'KP10023', N'房嘉佑')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'66ee973d-c1ca-4ad8-9a57-d0acdd26d901', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'0e2ead0b-4f6a-42e6-b954-6cf141fd025f', N'SG0007', N'Zhao Feng')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'fee614d1-29ca-4392-9339-d128b7568adc', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'0121', N'吴健会')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'92a0438c-03e2-4570-9322-d1372be54001', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'KP10039', N'殷霞文')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'cc63d7ef-1a72-4ad9-921a-d1e898147faa', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'0108', N'Tong He')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'0ed98987-240b-4c86-9f48-d26d3402536c', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'0123', N'杨轶')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'3e8ce818-43e4-486e-8bc6-da63899b9df9', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'KP10007', N'历浩言')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'99d3f991-3000-4720-bc9f-df2714b8ce79', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'KP10021', N'Ye Xingwen')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'908c3232-a15a-49f2-a4fa-e21e2ebe29be', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'SG0004', N'赵标 ')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'b0ad74df-71e2-480c-9cf0-e9f036ac42c4', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'0116', N'姚添慧')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'd85e67ea-e03c-472c-a249-eee76ff36524', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'0111', N'Ye Nannan')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'7bde57d9-da29-4474-8820-ef3b9b2fa8e7', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'KP10037', N'范夏岚')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'e28b7754-d943-4129-a8c4-ef60dfbe28e2', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'SG0014', N'赵春风')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'd4929e92-d34f-4223-b609-f1b6b7ff5a07', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'0124', N'Quiet')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'9a150666-fac1-4ba1-bc63-f2bf3f0055f1', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'SG0008', N'赵福涛')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'1fd9eec8-998b-4808-b963-f8bf3b7052b3', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'0113', N'黄爱辉')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'7ba375aa-756b-4065-aa9a-fb3029c9b208', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'KP10030', N'Gu Xinhou')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'48ce3cc3-cfc2-4cf2-92d3-fbf87e0200c0', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'b462147f-b47f-46b8-86f4-8042911d25aa', N'SG0009', N'张雷 ')
   GO
   INSERT [dbo].[Employee] ([ID], [EnterpriseCode], [ParentGUID], [ECode], [EName]) VALUES (N'0bca35ad-91b7-46f5-83b0-ffcdfdfe8d50', N'06bc0b1c-25b8-4d62-a1d6-ac7be1becf56', N'557c113a-786a-4dbc-9eb6-1aa80cfd9e68', N'0101', N'杨硕')
   GO
3. If I know the current user ID and I want to know who his superiors are, I can write the sql statement as follows
   
   Press Ctrl+C to copy the code

   WITH    Emp
             AS ( SELECT   ID ,
                           EName ,
                           ParentGUID
                  FROM     dbo.Employee
                  WHERE    ID = '5C8214EC-258B-4C44-9F31-206E499F0285'
                  UNION ALL  
                  SELECT   d.ID ,
                           d.EName ,
                           d.ParentGUID
                  FROM     Emp
                           INNER JOIN dbo.Employee d ON d.ID = Emp.ParentGUID
                )
       SELECT ID,EName
       FROM    Emp 

   查询结果为张跃光以及他的上级领导，如下图
   

4. 相反，如果已知当前用户ID，怎么获取他的下级呢，编写sql语句如下
   
   按 Ctrl+C 复制代码

   WITH    Emp
             AS ( SELECT   ID ,
                           EName ,
                           ParentGUID
                  FROM     dbo.Employee
                  WHERE    ID = '0CD19311-2CA1-4120-9554-11BFD8219AF9'
                  UNION ALL  
                  SELECT   d.ID ,
                           d.EName ,
                           d.ParentGUID
                  FROM     Emp
                           INNER JOIN dbo.Employee d ON d.ParentGUID = Emp.ID
                )
       SELECT ID,EName
       FROM    Emp
   

   查询结果为杜高扬以及他的所有下属，如下图
   
   

   
   

   是不是很方便的获取层级数据了呢！

   赶快试试举一反三吧！