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i would like to demonstrate the difference between lock and share mode and for update on mysql so lock and share mode and for update both have in common that that if they are used on a transaction the row cannot be updated by another transaction so lets see that in detail [Music] i start on the left side and say begin the transaction first begin and then i click select where marketer no select from marketer where id is one and that they they lock in share mode so this means this row now is locked in share mode if i i so i can select it from recta i can receive the value on a different connection and i can also see it if im in share mode with a different selection but i cannot um update it so so if i would do something like update magda set name to bob where id is one then as you can see here nothing happens so this statement waits until this transaction is over so if i commit this transaction i dont do any further changes on the left then the update will take place um and if i log