why did not suppert Rollback? postgresql

[henryhcface]

hi ,all
why did not suppert Rollback? postgresql

update user_t where user_id=103 set user_name='henr y'

but can not rollback . why , how to rollabck

and do not suppert the

delete from user_t where user_id=105 cascade;


why did not suppert cascade ?

thanks

[rski]

hi ,all
why did not suppert Rollback? postgresql

update user_t where user_id=103 set user_name='henr y'

but can not rollback . why , how to rollabck

and do not suppert the

delete from user_t where user_id=105 cascade;


why did not suppert cascade ?

thanks

If you want to use rollback you should first start a transaction. Maybe just read a postgres manual at postgresql.org