纯洁的一周又开始了，今天看到一则新闻，笑尿了，和袁友们一起娱乐下
最近两月在做基于Saas模式的人力资源管理产品，平常数据库设计我经常会遇到如下需求场景：
- 以前商城类网站在设计类型表的时候，设计成单表来存储商品类型数据，每条记录扩展一个父类型的ID，来体现层级关系。（电商网站常用）
- 最近在做人事管理系统中，企业的人员信息保存在一张表中，而企业的层级关系也是通过在用户表中扩展一个当前记录用户直接上级的标识
此种场景下就经常会出现一个业务场景，这些数据怎么去获取层级关系呢？当前已知ID，怎么获取他的子节点数据呢？怎么获取父节点的数据呢？
LZ也不卖关子了，就是如题所说的使用WITH AS语句，它可以提高性能简化嵌套SQL，而且多级递归有时候嵌套SQL都很难下手，LZ以前甚至在应用程序中用C#递归获取数据的笨方法。
WITH AS的含义
WITH AS短语，也叫做子查询部分（subquery factoring），可以让你做很多事情，定义一个SQL片断，该SQL片断会
被整个SQL语句所用到。有的时候，是为了让SQL语句的可读性更高些，也有可能是在UNION ALL的不同部分，作为提供数
据的部分。
特别对于UNION ALL比较有用。因为UNION ALL的每个部分可能相同，但是如果每个部分都去执行一遍的话，则成本太高，
所以可以使用WITH AS短语，则只要执行一遍即可。如果WITH AS短语所定义的表名被调用两次以上，则优化器会自动将
WITH AS短语所获取的数据放入一个TEMP表里，如果只是被调用一次，则不会。而提示materialize则是强制将WITH AS
短语里的数据放入一个全局临时表里。很多查询通过这种方法都可以提高速度。
下面就上面提到的第二个应用场景来详细介绍下：
-
创建一张企业员工表，表数据库设计如下：
1 CREATE TABLE [dbo].[Employee]( 2 [ID] [uniqueidentifier] NOT NULL,--用户ID 3 [EnterpriseCode] [uniqueidentifier] NOT NULL,--企业标识 4 [ParentGUID] [uniqueidentifier] NOT NULL,--上级ID 5 [ECode] [nvarchar](50) NOT NULL,--员工编号 6 [EName] [nvarchar](200) NOT NULL--员工名称 7 CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED 8 ( 9 [ID] ASC 10 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 11 ) ON [PRIMARY] 12 13 GO -
插入初始数据如下View Code
1 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\') 2 GO 3 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\') 4 GO 5 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\'赵宾 \') 6 GO 7 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\') 8 GO 9 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\') 10 GO 11 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\'张忠荣\') 12 GO 13 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\') 14 GO 15 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\') 16 GO 17 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\'贺雅柔\') 18 GO 19 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\') 20 GO 21 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\') 22 GO 23 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\'柴天元\') 24 GO 25 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\') 26 GO 27 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\') 28 GO 29 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\'邵乐家\') 30 GO 31 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\') 32 GO 33 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\') 34 GO 35 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\'卜婉慧\') 36 GO 37 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\') 38 GO 39 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\') 40 GO 41 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\'马乐意\') 42 GO 43 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\') 44 GO 45 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\') 46 GO 47 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\'银嘉树\') 48 GO 49 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\') 50 GO 51 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\') 52 GO 53 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\'金季同\') 54 GO 55 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\') 56 GO 57 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\') 58 GO 59 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\'古承颜\') 60 GO 61 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\') 62 GO 63 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\') 64 GO 65 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\'姚林蜀\') 66 GO 67 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\') 68 GO 69 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\') 70 GO 71 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\'房文栋\') 72 GO 73 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 \') 74 GO 75 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\') 76 GO 77 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\'巴元良\') 78 GO 79 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\') 80 GO 81 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\') 82 GO 83 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\'张亚春\') 84 GO 85 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\') 86 GO 87 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\') 88 GO 89 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\'毛婧\') 90 GO 91 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\') 92 GO 93 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\') 94 GO 95 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\'柳德运\') 96 GO 97 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 \') 98 GO 99 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\') 100 GO 101 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\'蔺力强\') 102 GO 103 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\') 104 GO 105 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\') 106 GO 107 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\'闻成龙\') 108 GO 109 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\') 110 GO 111 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\') 112 GO 113 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\'张莉\') 114 GO 115 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\') 116 GO 117 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\') 118 GO 119 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\'乔泰和\') 120 GO 121 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\') 122 GO 123 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\') 124 GO 125 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\'查泰宁\') 126 GO 127 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\') 128 GO 129 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\') 130 GO 131 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\'赵锋 \') 132 GO 133 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\') 134 GO 135 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\') 136 GO 137 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\'童禾\') 138 GO 139 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\') 140 GO 141 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\') 142 GO 143 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\'冶星文\') 144 GO 145 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 \') 146 GO 147 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\') 148 GO 149 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\'叶楠楠\') 150 GO 151 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\') 152 GO 153 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\') 154 GO 155 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\'姚静\') 156 GO 157 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\') 158 GO 159 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\') 160 GO 161 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\'古信厚\') 162 GO 163 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 \') 164 GO 165 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\') 166 GO -
如果已知当前用户ID我要想知道他的上级领导有哪些，可编写sql语句如下
1 WITH Emp 2 AS ( SELECT ID , 3 EName , 4 ParentGUID 5 FROM dbo.Employee 6 WHERE ID = \'5C8214EC-258B-4C44-9F31-206E499F0285\' 7 UNION ALL 8 SELECT d.ID , 9 d.EName , 10 d.ParentGUID 11 FROM Emp 12 INNER JOIN dbo.Employee d ON d.ID = Emp.ParentGUID 13 ) 14 SELECT ID,EName 15 FROM Emp查询结果为张跃光以及他的上级领导，如下图
-
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
1 WITH Emp 2 AS ( SELECT ID , 3 EName , 4 ParentGUID 5 FROM dbo.Employee 6 WHERE ID = \'0CD19311-2CA1-4120-9554-11BFD8219AF9\' 7 UNION ALL 8 SELECT d.ID , 9 d.EName , 10 d.ParentGUID 11 FROM Emp 12 INNER JOIN dbo.Employee d ON d.ParentGUID = Emp.ID 13 ) 14 SELECT ID,EName 15 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！
如果您觉得此文对你有用，不要吝啬右边的推荐哦，大家的支持是我分享智慧的动力:-)