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start transaction; insert into yang values(NULL,'yang') ; insert into yang values(NULL,'long'); insert into yang values(NULL,'fei'); commit;
start transaction; select * from yang; //(1) select * from yang; //(2) commit;
start transaction; insert into yang values(NULL,'tian'); commit;
start transaction; delete from yang where id=1; commit;
start transaction; update yang set name='Long' where id=2; commit;
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