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MikeSaunders
Starting Member
11 Posts |
Posted - 2012-09-30 : 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, ParentlocationIDThe 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
Posting Yak Master
110 Posts |
Posted - 2012-09-30 : 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, streetFROM Locations WHERE country ='yourcountry' Maybe I misunderstand your question. |
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MikeSaunders
Starting Member
11 Posts |
Posted - 2012-09-30 : 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 Netherlands501 Germany502 Belgium1001 Amsterdam1002 Rotterdam1003 Brussels5000 Amsterdam Center5001 The Pijp10001 Damrak10002 Rue de BrusselsIn 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 YorkIn 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 Center5001 The Pijp10001 Damrak |
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sunitabeck
Master Smack Fu Yak Hacker
5155 Posts |
Posted - 2012-09-30 : 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
11 Posts |
Posted - 2012-10-01 : 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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