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MYSQL where exists
select * from h247app_questions a where exists(
select * from h247app_questions b where b.quest_parent=a.quest_id
) and test_id=10413;
update h247app_questions a set a.quest_intro=a.quest_name where exists(
select * from h247app_questions b where b.quest_parent=a.quest_id
);
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