mysql sql查询转换为mongoDB NOSQL的脚本

我写了一个MYSQL，谁能帮我转化一下 NOSQL

INSERT INTO hlq_user_privateuser(fromUserID ,fromNickName ,toUserID , toNickName, isDeleted ,showFlag ,deletedOn ,dataJson)
SELECT  fromUserID ,fromNickName ,toUserID , toNickName,0, 1, createdon,()
FROM hlq_user_privatechat WHERE privateID IN (
SELECT MAX(privateID) FROM hlq_user_privatechat GROUP BY CONCAT(IF(`fromUserID` < `toUserID`, `fromUserID`, `toUserID`),
 IF(`fromUserID` > `toUserID`, `fromUserID`, `toUserID`)) )