查询多表集合（union）、查询时建临时字段、查询时给字段设置默认值

(select recharge_arrive_time as time,recharge_amount as amount,state,'充值' AS type from onlinerecharge where user_id=1)
UNION 
(select confirm_time as time,withdraw_cash_amount as amount,state,'提现' AS type from withdrawcash where user_id=1)
UNION 
(select i.create_time as time,i.investment_amount as amount,i.invest_state as state, b.bid_name as type from invest i
INNER JOIN bid b
on i.bid_id=b.bid_id
where i.user_id=1)
UNION 
(select r.exact_repayment_time as time,r.should_repayment_amount as amount,r.state as state, b.bid_name as type from repayment r 
INNER JOIN bid b
on r.bid_id=b.bid_id
where r.user_id=1)
UNION 
(select created_date_long as time,reward_amount as amount,reward_source as state,reward_name AS type  from investreward where user_id=1)
UNION 
(select a.created_date_long as time,a.actual_amount as amount,ac.amount as state,'多利宝存入' as type from dollyadd a
INNER JOIN dollyflow f
on a.dolly_flow_id= f.dolly_flow_id
INNER JOIN dollyaccount ac
ON a.user_id = ac.user_id
where a.user_Id = 1)
UNION
(select r.redeeml_arrive_time as time,r.amount as amount,'' as state,'多利宝赎回' as type from dollyredeem r
INNER JOIN dollyflow f
ON r.dolly_flow_id=f.dolly_flow_id
where r.user_id=1)
UNION
(select u.hb_get_time as time,h.hongbao_amount as amount,h.hongbao_name as state,'红包奖励' as type from userhongbao u 
INNER JOIN hongbao h
ON u.hongbao_id= h.hongbao_id
where user_id=1)
ORDER BY time DESC