## mark a section (Learn more)

mysql> select account_id from branches where extension="8002034138"; +------------+ | account_id | +------------+ | NULL | +------------+ 1 row in set (0.01 sec) mysql> select * from branches where account_id=NULL; Empty set (0.01 sec) mysql> select * from branches where account_id='NULL'; Empty set (0.01 sec) mysql>

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