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    <p>Please note this answer has nothing to do with Django, but hopefully give you another alternative to think about.</p> <p>You didn't mention your database, however, in SQL Server there is a <a href="http://msdn.microsoft.com/en-us/library/ms173784.aspx" rel="nofollow">BINARY_CHECKSUM()</a> keyword you can use to give you a unique value for the data held in the row. Think of it as a hash against all the fields in the row. This checksum method can be used to update a database from another by checking if local row checksum &lt;> remote row checksum.</p> <p>This SQL below will update a local database from a remote database. It won't insert new rows, for that you use <code>insert ... where id &gt; @MaxLocalID</code></p> <pre><code>SELECT delivery_item_id, BINARY_CHECKSUM(*) AS bc INTO #DI FROM [REMOTE.NETWORK.LOCAL].YourDatabase.dbo.delivery_item di SELECT delivery_item_id, BINARY_CHECKSUM(*) AS bc INTO #DI_local FROM delivery_item di -- Get rid of items that already match DELETE FROM #DI_local WHERE delivery_item_id IN (SELECT l.delivery_item_id FROM #DI x, #DI_local l WHERE l.delivery_item_id = x.delivery_item_id AND l.bc = x.bc) DROP TABLE #DI UPDATE DI SET engineer_id = X.engineer_id, ... -- Set other fields here FROM delivery_item DI, [REMOTE.NETWORK.LOCAL].YourDatabase.dbo.delivery_item x, #DI_local L WHERE x.delivery_item_id = L.delivery_item_id AND DI.delivery_item_id = L.delivery_item_id DROP TABLE #DI_local </code></pre> <p>For the above to work, you will need a linked server between your local database and the remote database:</p> <pre><code>-- Create linked server if you don't have one already IF NOT EXISTS ( SELECT srv.name FROM sys.servers srv WHERE srv.server_id != 0 AND srv.name = N'REMOTE.NETWORK.LOCAL' ) BEGIN EXEC master.dbo.sp_addlinkedserver @server = N'REMOTE.NETWORK.LOCAL', @srvproduct = N'SQL Server' EXEC master.dbo.sp_addlinkedsrvlogin @rmtsrvname = N'REMOTE.NETWORK.LOCAL', @useself = N'False', @locallogin = NULL, @rmtuser = N'your user name', @rmtpassword = 'your password' END GO </code></pre>
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    1. POAutomate the generation of natural keys
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    1. COThis is not exactly what I want to achieve: not a sync between databases but a user-driven exchange of data between separate installation of the same database. That is: user A inserts his data into his installation, then exports the data in a file and gives it to user B which loads the data into his own installation (which already has its data). I want to avoid any ID conflict (and manage all the other issues!)
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    2. COHi Don. In that case you should use a GUID as your key. The database can automatically generate these for you. See uniqueidentifier. We have 50+ warehouses all inserting data remotely and send their data up to our primary database using SQL Server replication. They all use a GUID as the primary key as this is guaranteed to be unique. It works very well.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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