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SQL Server how to select an id from one table and insert into another when related

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Last Modified: 2012-05-12
Hi Experts,

In SQL Server 2008 I have 3 tables:
1. State (fields = ID,statename)
2. County (fields = ID,stateid,countyname)
3. Town (fields = ID,stateid,countyid,townname)

Every field except stateid in the table called Town is populated. I know I can relate tables however for reasons too long to go into, I need to have the relevant stateid in the Town table so my question is:

How do I make a query using SQL Server where it inserts the correct stateid into the Town table? (presumably by connecting the last two tables (County and Town) on County field ID = Town field countyid)

It must be an efficient piece of code, my Town table has nearly 120,000 rows in it! I *MUST* do it this way, not relate the tables.

Thanks

/ Tobzzz

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