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MikeSaunders
Starting Member
6 Posts |
 Posted - 09/30/2012 : 04:57:28
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Hello all,
I'm wondering if it is possible to do the following. I have a table with locations in the world.
All locations have the locationtype continent, country, state, city, neigbourhood or street.
Also i have a table that tell contains all parent locations of a location (e.g. the parent location of a state is a country) That table looks like:
LocationID, Locationname, ParentlocationID
The parentlocationID refers to the locationID of the parent Location.
Now I want to make a query that shows me all underlying locations of a given location. E.g. when i search for a location that is a country i get all states, cities, neigbourhoods and streets for that country. But when i search for a city it will show only all neighbourhoods and streets.
Does somebody know how to solve this?
Any suggestions are welcome!!
Thanks!!
Mike |
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HenryFulmer
Yak Posting Veteran
USA
98 Posts |
Posted - 09/30/2012 : 10:24:17
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Not sure what you need the parentlocation table for? You already seem to have all parameters in one table, so wouldn't it be just a simple select?
SELECT state, city, neigborhood, street
FROM Locations
WHERE country ='yourcountry'
Maybe I misunderstand your question. |
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MikeSaunders
Starting Member
6 Posts |
Posted - 09/30/2012 : 10:40:46
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In addition to my question some examples:
CREATE TABLE [ParentRegionList](
[RegionID] [int] NOT NULL,
[RegionType] [nvarchar](50) NULL,
[RegionName] [nvarchar](255) NULL,
[ParentRegionID] [int] NULL
)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (1,'Continent','Europe',0)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (2,'Continent','North America',0)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (500,'Country','The Netherlands',1)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (501,'Country','Germany',1)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (502,'Country','Belgium',1)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (550,'Country','United States of America',2)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (800,'State','New York',550)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (1000,'City','New York',800)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (1001,'City','Amsterdam',500)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (1002,'City','Rotterdam',500)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (1003,'City','Brussels',502)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (5000,'Neighborhood','Amsterdam Center',1001)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (5001,'Neighborhood','The Pijp',1001)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (10001,'Street','Damrak',5000)
INSERT INTO [ParentRegionList] ([RegionID],[RegionType],[RegionName],[ParentRegionID]) VALUES (10002,'Street','Rue de Brussels',1003)
In this example the search variable 1 (Europe) has to show all records that are (in)direct (top down) connected to RegionID 1 so:
500 The Netherlands
501 Germany
502 Belgium
1001 Amsterdam
1002 Rotterdam
1003 Brussels
5000 Amsterdam Center
5001 The Pijp
10001 Damrak
10002 Rue de Brussels
In this example the search variable 800 (state new york) has to show all records that are (in)direct (top down) connected to RegionID 800 so:
1000 New York
In this example the search variable 1001 (Amsterdam) has to show all records that are (in)direct (top down) connected to RegionID 1001 so:
5000 Amsterdam Center
5001 The Pijp
10001 Damrak |
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sunitabeck
Flowing Fount of Yak Knowledge
5152 Posts |
Posted - 09/30/2012 : 19:03:36
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You can use a recursive CTE like shown below:DECLARE @searchId INT = 1;
;WITH cte AS
(
SELECT * FROM ParentRegionList WHERE RegionID = @searchId
UNION ALL
SELECT p.* FROM ParentRegionList p
INNER JOIN cte c ON c.RegionId = p.ParentRegionID
)
SELECT * FROM cte
-- where regionId <> @searchId -- if you want to exclude the search region id. |
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MikeSaunders
Starting Member
6 Posts |
Posted - 10/01/2012 : 04:06:33
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Thanks, This works!!!
quote:
Originally posted by sunitabeck
You can use a recursive CTE like shown below:DECLARE @searchId INT = 1;
;WITH cte AS
(
SELECT * FROM ParentRegionList WHERE RegionID = @searchId
UNION ALL
SELECT p.* FROM ParentRegionList p
INNER JOIN cte c ON c.RegionId = p.ParentRegionID
)
SELECT * FROM cte
-- where regionId <> @searchId -- if you want to exclude the search region id.
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