mysql语句写法（左连与子查询结合）实战
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select
c.card_number,
c.card_name,
t.type_name,
c.card_discount,
t.type_low,
c.card_integral,
(c.card_recharge_balance+c.card_give_balance) as num,
v.people,
c.card_time
from
`vip_card` as c
left join
(
select
count(vipid) as people,
card_number
from vip
group by card_number
) as v
on
c.card_number=v.card_number
left join
`vip_type` as t
on
c.type_id=t.type_id
where
c.store_key=‘556655‘;
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