Get The Names For Different Levels In A Table
Aug 20, 2007
hi
I've a table with coln names
ID
Name
ParentID
Level
I've list with different levels
say
ex.
the Data is:-
ID Name ParentID Level
1 Root null 1
2 Trunk 1 2
3 Branch 2 3
4 Leaf 3 4
5 Stem 3 4
How to write the query for getting the Names for different levels for corresponding ParentID....
Output should be like:-
Leaf Branch Trunk Root
Stem Branch Trunk Root
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Oct 3, 2006
The script below can be used to determine the reference levels of all tables in a database in order to be able to create a script to load tables in the correct order to prevent Foreign Key violations.
This script returns 3 result sets. The first shows the tables in order by level and table name. The second shows tables and tables that reference it in order by table and referencing table. The third shows tables and tables it references in order by table and referenced table.
Tables at level 0 have no related tables, except self-references. Tables at level 1 reference no other table, but are referenced by other tables. Tables at levels 2 and above are tables which reference lower level tables and may be referenced by higher levels. Tables with a level of NULL may indicate a circular reference (example: TableA references TableB and TableB references TableA).
Tables at levels 0 and 1 can be loaded first without FK violations, and then the tables at higher levels can be loaded in order by level from lower to higher to prevent FK violations. All tables at the same level can be loaded at the same time without FK violations.
Tested on SQL 2000 only. Please post any errors found.
Edit 2006/10/10:
Fixed bug with tables that have multiple references, and moved tables that have only self-references to level 1 from level 0.
-- Start of Script - Find_Table_Reference_Levels.sql
/*
Find Table Reference Levels
This script finds table references and ranks them by level in order
to be able to load tables with FK references in the correct order.
Tables can then be loaded one level at a time from lower to higher.
This script also shows all the relationships for each table
by tables it references and by tables that reference it.
Level 0 is tables which have no FK relationships.
Level 1 is tables which reference no other tables, except
themselves, and are only referenced by higher level tables
or themselves.
Levels 2 and above are tables which reference lower levels
and may be referenced by higher levels or themselves.
*/
declare @r table (
PK_TABLE nvarchar(200),
FK_TABLE nvarchar(200),
primary key clustered (PK_TABLE,FK_TABLE))
declare @rs table (
PK_TABLE nvarchar(200),
FK_TABLE nvarchar(200),
primary key clustered (PK_TABLE,FK_TABLE))
declare @t table (
REF_LEVEL int,
TABLE_NAME nvarchar(200) not null primary key clustered )
declare @table table (
TABLE_NAME nvarchar(200) not null primary key clustered )
set nocount off
print 'Load tables for database '+db_name()
insert into @table
select
TABLE_NAME = a.TABLE_SCHEMA+'.'+a.TABLE_NAME
from
INFORMATION_SCHEMA.TABLES a
where
a.TABLE_TYPE = 'BASE TABLE'and
a.TABLE_SCHEMA+'.'+a.TABLE_NAME <> 'dbo.dtproperties'
order by
1
print 'Load PK/FK references'
insert into @r
selectdistinct
PK_TABLE =
b.TABLE_SCHEMA+'.'+b.TABLE_NAME,
FK_TABLE =
c.TABLE_SCHEMA+'.'+c.TABLE_NAME
from
INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS a
join
INFORMATION_SCHEMA.TABLE_CONSTRAINTS b
on
a.CONSTRAINT_SCHEMA = b.CONSTRAINT_SCHEMA and
a.UNIQUE_CONSTRAINT_NAME = b.CONSTRAINT_NAME
join
INFORMATION_SCHEMA.TABLE_CONSTRAINTS c
on
a.CONSTRAINT_SCHEMA = c.CONSTRAINT_SCHEMA and
a.CONSTRAINT_NAME = c.CONSTRAINT_NAME
order by
1,2
print 'Make copy of PK/FK references'
insert into @rs
select
*
from
@r
order by
1,2
print 'Load un-referenced tables as level 0'
insert into @t
select
REF_LEVEL = 0,
a.TABLE_NAME
from
@table a
where
a.TABLE_NAME not in
(
select PK_TABLE from @r union all
select FK_TABLE from @r
)
order by
1
-- select * from @r
print 'Remove self references'
delete from @r
where
PK_TABLE = FK_TABLE
declare @level int
set @level = 0
while @level < 100
begin
set @level = @level + 1
print 'Delete lower level references'
delete from @r
where
PK_TABLE in
( select TABLE_NAME from @t )
or
FK_TABLE in
( select TABLE_NAME from @t )
print 'Load level '+convert(varchar(20),@level)+' tables'
insert into @t
select
REF_LEVEL =@level,
a.TABLE_NAME
from
@table a
where
a.TABLE_NAME not in
( select FK_TABLE from @r )
and
a.TABLE_NAME not in
( select TABLE_NAME from @t )
order by
1
if not exists (select * from @r )
begin
print 'Done loading table levels'
print ''
break
end
end
print 'Count of Tables by level'
print ''
select
REF_LEVEL,
TABLE_COUNT = count(*)
from
@t
group by
REF_LEVEL
order by
REF_LEVEL
print 'Tables in order by level and table name'
print 'Note: Null REF_LEVEL nay indicate possible circular reference'
print ''
select
b.REF_LEVEL,
TABLE_NAME = convert(varchar(40),a.TABLE_NAME)
from
@table a
left join
@t b
on a.TABLE_NAME = b.TABLE_NAME
order by
b.REF_LEVEL,
a.TABLE_NAME
print 'Tables and Referencing Tables'
print ''
select
b.REF_LEVEL,
TABLE_NAME = convert(varchar(40),a.TABLE_NAME),
REFERENCING_TABLE =convert(varchar(40),c.FK_TABLE)
from
@table a
left join
@t b
on a.TABLE_NAME = b.TABLE_NAME
left join
@rs c
on a.TABLE_NAME = c.PK_TABLE
order by
a.TABLE_NAME,
c.FK_TABLE
print 'Tables and Tables Referenced'
print ''
select
b.REF_LEVEL,
TABLE_NAME = convert(varchar(40),a.TABLE_NAME),
TABLE_REFERENCED =convert(varchar(40),c.PK_TABLE)
from
@table a
left join
@t b
on a.TABLE_NAME = b.TABLE_NAME
left join
@rs c
on a.TABLE_NAME = c.FK_TABLE
order by
a.TABLE_NAME,
c.PK_TABLE
-- End of Script
Results from Northwind database:
Load tables for database Northwind
(13 row(s) affected)
Load PK/FK references
(13 row(s) affected)
Make copy of PK/FK references
(13 row(s) affected)
Load un-referenced tables as level 0
(0 row(s) affected)
Remove self references
(1 row(s) affected)
Delete lower level references
(0 row(s) affected)
Load level 1 tables
(7 row(s) affected)
Delete lower level references
(9 row(s) affected)
Load level 2 tables
(4 row(s) affected)
Delete lower level references
(3 row(s) affected)
Load level 3 tables
(2 row(s) affected)
Done loading table levels
Count of Tables by level
REF_LEVEL TABLE_COUNT
----------- -----------
1 7
2 4
3 2
(3 row(s) affected)
Tables in order by level and table name
Note: Null REF_LEVEL nay indicate possible circular reference
REF_LEVEL TABLE_NAME
----------- ----------------------------------------
1 dbo.Categories
1 dbo.CustomerDemographics
1 dbo.Customers
1 dbo.Employees
1 dbo.Region
1 dbo.Shippers
1 dbo.Suppliers
2 dbo.CustomerCustomerDemo
2 dbo.Orders
2 dbo.Products
2 dbo.Territories
3 dbo.EmployeeTerritories
3 dbo.Order Details
(13 row(s) affected)
Tables and Referencing Tables
REF_LEVEL TABLE_NAME REFERENCING_TABLE
----------- ---------------------------------------- ----------------------------------------
1 dbo.Categories dbo.Products
2 dbo.CustomerCustomerDemo NULL
1 dbo.CustomerDemographics dbo.CustomerCustomerDemo
1 dbo.Customers dbo.CustomerCustomerDemo
1 dbo.Customers dbo.Orders
1 dbo.Employees dbo.Employees
1 dbo.Employees dbo.EmployeeTerritories
1 dbo.Employees dbo.Orders
3 dbo.EmployeeTerritories NULL
3 dbo.Order Details NULL
2 dbo.Orders dbo.Order Details
2 dbo.Products dbo.Order Details
1 dbo.Region dbo.Territories
1 dbo.Shippers dbo.Orders
1 dbo.Suppliers dbo.Products
2 dbo.Territories dbo.EmployeeTerritories
(16 row(s) affected)
Tables and Tables Referenced
REF_LEVEL TABLE_NAME TABLE_REFERENCED
----------- ---------------------------------------- ----------------------------------------
1 dbo.Categories NULL
2 dbo.CustomerCustomerDemo dbo.CustomerDemographics
2 dbo.CustomerCustomerDemo dbo.Customers
1 dbo.CustomerDemographics NULL
1 dbo.Customers NULL
1 dbo.Employees dbo.Employees
3 dbo.EmployeeTerritories dbo.Employees
3 dbo.EmployeeTerritories dbo.Territories
3 dbo.Order Details dbo.Orders
3 dbo.Order Details dbo.Products
2 dbo.Orders dbo.Customers
2 dbo.Orders dbo.Employees
2 dbo.Orders dbo.Shippers
2 dbo.Products dbo.Categories
2 dbo.Products dbo.Suppliers
1 dbo.Region NULL
1 dbo.Shippers NULL
1 dbo.Suppliers NULL
2 dbo.Territories dbo.Region
(19 row(s) affected)
CODO ERGO SUM
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