Question

MS SQL query tables auto increment

Asked by: groone

I have 3 tables
members
groups
group_map

Members is a simple table that holds user information.  Their ID is auto incremented.
Groups is a table that holds groups that members could be in.  Each group is given an ID that is also auto incremented.  This is pretty much static.  The group list is already filled and ID's given.
Group_Map is a two column table that has the ID column from Members and the ID column from Groups.  

I need to be able to put the Members ID into the Group_Map.  This becomes hard when the ID doesn't exist, say, when adding a new person since the ID in Members is auto increment.  How do I get the next ID?  Adding 1 wont work because if one of the users out of members is deleted it would throw the whole index off.

Query Suggestions?

Thanks!

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Asked On
2008-04-29 at 06:49:13ID23361993
Tags

MS SQL

Topic

MS SQL Server

Participating Experts
1
Points
250
Comments
7

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Answers

 

by: chapmandewPosted on 2008-04-29 at 06:55:26ID: 21462260

well, why don't you just get the id after you insert into the member table?

insert statement

select scope_identity()  --newly inserted ID

 

by: groonePosted on 2008-04-29 at 07:05:17ID: 21462359

If there are multiple people using the database, would scope_identity give the wrong ID or is it defined by session?

 

by: chapmandewPosted on 2008-04-29 at 07:06:58ID: 21462373

Nope, it is based on the session, so if multiple inserts happen at the same time, each session would get the value that they inserted...it wouldn't matter what the other sessions inserted.

 

by: groonePosted on 2008-04-29 at 07:10:59ID: 21462413

so can I use it like this

INSERT INTO group_map (mid, gid) VALUES (SCOPE_IDENTITY(), 23)

 

by: chapmandewPosted on 2008-04-29 at 07:12:28ID: 21462429

Yes, as long as you have inserted into the members table previously in the same scope (and it was the last table you inserted into that had an identity column)

insert into members

INSERT INTO group_map (mid, gid) VALUES (SCOPE_IDENTITY(), 23)

20120131-EE-VQP-002

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