Understanding updates and deadlocks more clearly

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Hey folks: I want to clarify a few things about locks on updates:

1- can two processes update the same table if they are updating different rows?

2- in the event of two processes trying to update the same row, does this always result in a deadlock?

3- is there a way to create a system whereby potentially concurrent processes can update the same row in a given table, can the server be made to queue those updates, etc?

Is it just a no-go to try and have a situation where concurrent processes are trying to update the same record?
 
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