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mysql transcations No ratings yet.

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Generally how to write transaction Begin transaction by issuing the SQL command BEGIN WORK. Issue one or more SQL commands like SELECT, INSERT, UPDATE or DELETE. Check if there is no error and everything is according to your requirement. If there is any error, then issue a ROLLBACK command, otherwise issue a COMMIT command.   how • Read More »

screen tmux cheat sheet No ratings yet.

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Screen screen -d -R your_session name //split only the monitor screen ctrl-a ( release the kb ), then press: | for vsplit    —> need this step : ctrl-a, c ( to create a new window, otherwise just blank screen) ctrl-a ( release the kb ), then press: shift s:  for hsplit ctrl-a , tab • Read More »

c++ multi-set/multi-map, set/map and its unordered version No ratings yet.

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container name implementation/underlying struct notes/ sample unordered_set  The value of an element is at the same time its key, that identifies it uniquely. hash table unordered_multiset much like unordered_set containers, but allowing different elements to have equivalent values. hash table Internally when an existing value is inserted, the data structure increases its count which is associated with each • Read More »