这是我的桌子
id | sender | receiver | msg
-----------------------------
1 | jon | jack | buzz ...
2 | jack | jon | ?
3 | adel | jon | met me soon
4 | jon | adel | okay
5 | alex | jon | where ar u ?
6 | jon | adel | okay
7 | adel | alex | don't forget the party
8 | jon | jack | may i borrow ur car
9 | …