?
今天有一個業務涉及到mongodb的多表查詢，大體記錄下語句結構
db.table_a.aggregate([
{$lookup:{from:"table_b",localField:"userid",foreignField:"userid",as:"organization_doc"}},? ?//聯表B
{
$project:{
_id:1,
cardid:1,
checkin_time:1,
checkin_date:1,
userid:1,
selfcare_ability:1,
checkout_time:1,
checkout_date:1,
inventory_doc:"$organization_doc.name"
}? ? ?//通過project參數限制返回數據，提高效率
},
{$lookup:{from:"table_c",localField:"cardid",foreignField:"cardid",as:"archives_doc"}},??//聯表c
{$match:{"archives_doc.xingzheng_code" : "370213000001"}},? ?//匹配搜索條件condition
{$limit:10},{$skip:1}])? ?//其他參數，如條數顯示，翻頁，排序等
