我试图做左加入data.table,我想加入panelFull并panel在此基础上OutletID.
从panel我想要CellID插入列panelFull:
> panel[1:15,]
Period CellID OutletID ACV
1: 215 1268 M44600 9563317
2: 215 1268 M44800 8966339
3: 215 1268 M45100 7043924
4: 215 1268 M45200 9013918
5: 215 1268 M45300 10009468
6: 215 1268 M46900 22148703
7: 215 1268 M48400 18661734
8: 215 1268 M51000 8531347
9: 215 1268 M51500 9125734
10: 215 1268 M51600 8575727
11: 215 1268 M53700 12148614
12: 215 1268 …