Mysql左連線分頁查詢

個人**：

1.常見錯誤

select * from user t1 left join user_tages t2 on t2.userid=t1.id  limit 0,10

這種先連線查詢在分頁的是錯誤的，正常的是先分頁，再連線查詢

改進：（使用子查詢）

select t1.id,t1.program_token,t1.coupon_type,t1.name,t1.deduct,t1.discount,t1.valid_for_all_shop,

t1.lower_consumer_amount,t2.value_id as t_id,t2.item_type as t_type,
case
when t2.item_type='card' then (select card_name from card where id=t2.value_id and valid=1 and
program_token=#)
when t2.item_type='service' then (select title from ord_service where id=t2.value_id and valid=1 and
program_token=#)
endas t_name,
t1.valid_start_date,t1.valid_end_date,
t1.amount,t1.remain_amount,t1.use_range,
(select count(user_info_id) from user_coupons where coupon_id=t1.id) as received_amount,
(select count(user_info_id) from user_coupons where coupon_id=t1.id and use_status=1) as used_amount,
(select count(shop_id) from coupon_shop_relation where coupon_id=t1.id and valid=1) as able_shop_amount,
case
when t1.stop_grant_status=1 or now() > t1.valid_end_date then '已結束'
when now() between t1.valid_start_date and t1.valid_end_date then '進行中'
else '未開始'
endas status,
case
when t1.coupon_type='discount' then '折扣券'
when t1.coupon_type='deduction' then '抵扣券'
else '未知'
endas coupon_type_name,
case
when t1.use_range='all' then '所有專案'
when t1.use_range='part' then '指定專案'
else '未知'
endas use_range_name
from
(select * from coupon t where t.program_token=# and t.valid=1
and t.name like #
and t.coupon_type=#
order by t.create_time desc limit
#,# ) t1
left join coupon_item_relation t2 on t1.id=t2.coupon_id
order by t1.create_time desc

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