???? ? ? ???
?? ???
??
??? ??
?????
GROUP BY EXTRACT(DAY FROMride.timestamp) ? ????? ???? ???? ????. ??? ?? ? ? ???? ??? ?? ???? ???? ????? ? ???? ???? ??? ??? ???? ???? ?????. OUTER ??? ???? ????? mysql? OUTER JOIN
? ???? ????.?? ??? ? ??? ??? ??? ?? ???? ???? ?????
????
1
0
0
![[? ?????] Node.js ?? ??](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
