[Backend #8] How to avoid deadlock in DB transaction? Queries order matters!

One of the hardest things when working with database transactions is locking and handling deadlock. The best way to deal with deadlock is to avoid it, which means we should fine-tune our queries in the transaction so that deadlock won’t have a chance to occur, or at least minimize its chance of occurrence. That’s exactly what I’m gonna show you in this video.
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