我們在查詢資料的時候，經常遇到一對多的表關係，對其進行多表關聯查詢，
但是在列表裡面顯示資料的時候需要根據一的表進行資料顯示，同時在一行內顯示多的資料。大概例子如下圖所示
這時候我們可以使用group_concat進行資料查詢的一些處理：
select
com.serial_number,
cis.customer_type,
cis.company_name,
cis.`name`,
cis.logo_pic,
cba.contract,
cba.telephone,
cba.province,
cba.city,
cba.area,
cba.address,
group_concat(
''),
com.pk_invoices,
com.total_num,
com.cost_num,
com.order_status,
com.real_num,
com.pk_order,
com.billing_status,
ccb.code_type,
ccb.bankcode
from
cti_order_message com
inner
join cti_bank_address cba on cba.pk_bank_address = com.pk_bank_address
inner
join cti_individual_customer cis on cis.pk_customer = com.pk_customer
left
join cti_customer_bankcode ccb on com.pk_bank_code = ccb.pk_bankcode
left
join cti_order_and_product coap on com.pk_order = coap.pk_order
left
join (
select
pm.pk_product,
pm.product_name,
pm.product_logo_pic,
cpd.discount_type,
cpd.enough_price,
cpd.sub_price,
cpd.enough_num,
cpd.give_product_num,
cpd.give_product_name,
cpd.give_product_logo_pic,
cpd.discount_price,pm.product_weight,pm.retail_price,cpc.catalog_name
from
cti_product_message pm
left
join (
select
cpd.pk_product,
cpd.discount_type,
cpd.enough_price,
cpd.sub_price,
cpd.enough_num,
cpd.give_product_num,
cpm.product_name as give_product_name,
cpm.product_logo_pic as give_product_logo_pic,
cpd.discount_price
from
cti_product_discount cpd
left
join cti_product_message cpm on cpd.give_pk_product = cpm.pk_product
where
cpd.dr = 0
and cpd.start_date <= '2017-08-22 13:16:00'
and cpd.end_date >= '2017-08-22 13:16:00'
and cpd.use_status = 1
and (
cpd.is_all_bank = 1
or (
is_all_bank = 2
and find_in_set(
'40289f9a5d7d9602015d7d9baf000000',
pkbank))
)) cpd on pm.pk_product = cpd.pk_product
left
join cti_product_catalog cpc on cpc.pk_catalog = pm.pk_catalog
) cpm on coap.pk_product = cpm.pk_product
where
com.dr = 0
and com.order_status = 1
and com.pk_order = '40289f9a5def7129015def728c310003'
group
by com.pk_order;
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