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    <p>I don't know what the context of your scenario is, but it might be worth looking into using a more pre-fabiracted method to generate your unique tokens (Unique ID on the table for instancE?)</p> <p>That being said, if you want the fine-tuning control over the format of your token, it might be worth looking into wrapping the uniqueness-generation routine into SQL procedure, so that the determination is made in one transaction, rather than kicing off a separate communication request for every iteration.</p> <p>Something like this generates 1000 "unique" tokens, but it could be easily adjusted to loop until the code is truly unique rather than a fixed number of loops (and it can probably be cleaned up a bit :) ):</p> <pre><code>DECLARE @token as varchar(6), @numberOfLoops int, @currentLoop int, @pool varchar(50) -- Initialize SET @token = '' SET @numberOfLoops = 1000 SET @currentLoop = 0 SET @pool = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890'; WHILE (@currentLoop &lt; @numberOfLoops) BEGIN SET @token = SUBSTRING(@pool, CAST((RAND() * LEN(@pool) + 1) as int), 1) + SUBSTRING(@pool, CAST((RAND() * LEN(@pool) + 1) as int), 1) + SUBSTRING(@pool, CAST((RAND() * LEN(@pool) + 1) as int), 1) + SUBSTRING(@pool, CAST((RAND() * LEN(@pool) + 1) as int), 1) + SUBSTRING(@pool, CAST((RAND() * LEN(@pool) + 1) as int), 1) + SUBSTRING(@pool, CAST((RAND() * LEN(@pool) + 1) as int), 1); print @token; SET @currentLoop = @currentLoop + 1; END </code></pre> <p>There are some major caveats to consider here, though. The biggest concern I can think of with tokens you roll yourself is the problem of temporary uniqueness. Depending on when you're assigning the token, it may be unique w/r/t your data source one moment, but then --- potentially -- claimed the next if you're not careful.</p>
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