SQL Server 2005 Recursion(递归) and WITH Clause

  1 /*
  2 from: http://www.eggheadcafe.com/articles/sql_server_recursion_with_clause.asp
  3 http://msdn.microsoft.com/en-us/library/ms186243.aspx
  4 http://msdn.microsoft.com/en-us/library/aa175801%28SQL.80%29.aspx
  5 SQL Server 2005 Recursion and WITH Clause
  6 SQL Server 2005的递归和WITH子句
  7 */
  8 ---1 Table of Contents Hierarchy
  9  set nocount on
 10  
 11   declare @Sample1 table
 12   (
 13       RecordID int  Primary key NOT NULL ,
 14       ParentRecordID int,
 15       SortOrder int,
 16       Description nvarchar(100),
 17       Salary money
 18    )
 19  
 20  /* Start loading of test data */
 21   insert into @Sample1 values(1,null,null,'CEO',10)
 22   insert into @Sample1 values(2,1,1,'Vice Pres. Marketing',9)
 23   insert into @Sample1 values(3,1,2,'Vice Pres. Ops-',8)
 24   insert into @Sample1 values(4,2,1,'Marketing Director - Direct Mail',7)
 25   insert into @Sample1 values(5,2,2,'Marketing Director - TV',6)
 26   insert into @Sample1 values(6,1,3,'Vice Pres. - Research',5)
 27   insert into @Sample1 values(7,4,1,'Human Resources Director',4)
 28   insert into @Sample1 values(8,4,2,'Some other item',3)
 29   insert into @Sample1 values(9,6,1,'Research Analyst',2)
 30 
 31   set nocount off;
 32 
 33  with RecursionCTE (RecordID,ParentRecordID,SortOrder,Salary,TOC)
 34  as
 35  (
 36    select RecordID,ParentRecordID,SortOrder,Salary,
 37           convert(varchar(100),'') TOC
 38       from @Sample1
 39       where ParentRecordID is null
 40    union all
 41    select R1.RecordID,
 42           R1.ParentRecordID,
 43           R1.SortOrder,
 44           R1.Salary,
 45           case when DataLength(R2.TOC) > 0
 46                     then convert(varchar(100),R2.TOC + '.'
 47                                  + cast(R1.SortOrder as varchar(10)))
 48                     else convert(varchar(100),
 49                                 cast(R1.SortOrder as varchar(10)))
 50                     end as TOC
 51       from @Sample1 as R1
 52      join RecursionCTE as R2 on R1.ParentRecordID = R2.RecordID
 53   )
 54 
 55 select * from RecursionCTE order by ParentRecordID,SortOrder asc
 56 
 57 --2 Sum Up Subordinate Salaries of All Employees
 58 
 59 set nocount on
 60  
 61   declare @Sample1 table
 62   (
 63       RecordID int  Primary key NOT NULL ,
 64       ParentRecordID int,
 65       SortOrder int,
 66       Description nvarchar(100),
 67       Salary money
 68    )
 69  
 70  /* Start loading of test data */
 71   insert into @Sample1 values(1,null,null,'CEO',10)
 72   insert into @Sample1 values(2,1,1,'Vice Pres. Marketing',9)
 73   insert into @Sample1 values(3,1,2,'Vice Pres. Ops-',8)
 74   insert into @Sample1 values(4,2,1,'Marketing Director - Direct Mail',7)
 75   insert into @Sample1 values(5,2,2,'Marketing Director - TV',6)
 76   insert into @Sample1 values(6,1,3,'Vice Pres. - Research',5)
 77   insert into @Sample1 values(7,4,1,'Human Resources Director',4)
 78   insert into @Sample1 values(8,4,2,'Some other item',3)
 79   insert into @Sample1 values(9,6,1,'Research Analyst',2)
 80 
 81 set nocount off;
 82 
 83  with RecursionCTE (RecordID,ParentRecordID,SortOrder,Salary)
 84  as
 85  (
 86    select RecordID,ParentRecordID,SortOrder,Salary
 87       from @Sample1
 88       where ParentRecordID is null
 89    union all
 90    select R1.RecordID,
 91           R1.ParentRecordID,
 92           R1.SortOrder,
 93           R1.Salary
 94       from @Sample1 as R1
 95      join RecursionCTE as R2 on R1.ParentRecordID = R2.RecordID
 96   )
 97  select sum(R1.salary) as Salary
 98    from @Sample1 as R1
 99    JOIN RecursionCTE as R2
100    on R1.RecordID = R2.RecordID
101 --3  Sum Up Subordinate Salaries of a Specific Employee
102 set nocount on
103  
104   declare @Sample1 table
105   (
106       RecordID int  Primary key NOT NULL ,
107       ParentRecordID int,
108       SortOrder int,
109       Description nvarchar(100),
110       Salary money
111    )
112  
113  /* Start loading of test data */
114   insert into @Sample1 values(1,null,null,'CEO',10)
115   insert into @Sample1 values(2,1,1,'Vice Pres. Marketing',9)
116   insert into @Sample1 values(3,1,2,'Vice Pres. Ops-',8)
117   insert into @Sample1 values(4,2,1,'Marketing Director - Direct Mail',7)
118   insert into @Sample1 values(5,2,2,'Marketing Director - TV',6)
119   insert into @Sample1 values(6,1,3,'Vice Pres. - Research',5)
120   insert into @Sample1 values(7,4,1,'Human Resources Director',4)
121   insert into @Sample1 values(8,4,2,'Some other item',3)
122   insert into @Sample1 values(9,6,1,'Research Analyst',2)
123 
124 set nocount off;
125 
126  with RecursionCTE (RecordID,ParentRecordID,SortOrder,Salary)
127  as
128  (
129    select RecordID,ParentRecordID,SortOrder,Salary
130       from @Sample1
131       where ParentRecordID =2 -- specific employee id
132    union all
133    select R1.RecordID,
134           R1.ParentRecordID,
135           R1.SortOrder,
136           R1.Salary
137       from @Sample1 as R1
138      join RecursionCTE as R2 on R1.ParentRecordID = R2.RecordID
139   )
140  select sum(R1.salary) as Salary
141    from @Sample1 as R1
142    JOIN RecursionCTE as R2
143    on R1.RecordID = R2.RecordID
144 
145 --4  Manager to Subordinate Salary Differential
146 
147 set nocount on
148  
149   declare @Sample1 table
150   (
151       RecordID int  Primary key NOT NULL ,
152       ParentRecordID int,
153       SortOrder int,
154       Description nvarchar(100),
155       Salary money
156    )
157  
158  /* Start loading of test data */
159   insert into @Sample1 values(1,null,null,'CEO',10)
160   insert into @Sample1 values(2,1,1,'Vice Pres. Marketing',9)
161   insert into @Sample1 values(3,1,2,'Vice Pres. Ops-',8)
162   insert into @Sample1 values(4,2,1,'Marketing Director - Direct Mail',7)
163   insert into @Sample1 values(5,2,2,'Marketing Director - TV',6)
164   insert into @Sample1 values(6,1,3,'Vice Pres. - Research',5)
165   insert into @Sample1 values(7,4,1,'Human Resources Director',4)
166   insert into @Sample1 values(8,4,2,'Some other item',3)
167   insert into @Sample1 values(9,6,1,'Research Analyst',2)
168 
169 set nocount off;
170 
171  with RecursionCTE (RecordID,ParentRecordID,SortOrder,ParentSalary,Salary,Differential)
172  as
173  (
174    select RecordID,ParentRecordID,SortOrder,
175             convert(money,null) as ParentSalary,
176             Salary,
177             convert(money,null) as Differential
178       from @Sample1
179       where ParentRecordID is null
180    union all
181    select R1.RecordID,
182             R1.ParentRecordID,
183             R1.SortOrder,
184             convert(money,R2.Salary) as ParentSalary,
185             R1.Salary,
186             convert(money,R2.Salary - R1.Salary) as Differential
187       from @Sample1 as R1
188      join RecursionCTE as R2 on R1.ParentRecordID = R2.RecordID
189    
190      
191   )
192 
193 select * from RecursionCTE order by ParentRecordID,SortOrder asc