oracle从多表中获取数据，而后用一条sql语句插入多条数据

insert into  user_role   select a.sys_role_id,b.sys_user_id from (select s.sys_user_id from sys_user s where s.user_acct = 'SUPPORT_HQ') b , (select s.sys_role_id from sys_role s where s.role_name　in

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