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- persid date rating
- 10000 1/1/2014 A
- 10000 1/2/2014 B
- 10001 1/1/2014 A
- 10001 1/2/2014 B
- 10002 1/1/2014 A
- 10002 1/2/2014 B
- . . .
- . . .
- . . .
- setkey[tb1, persid]
- tb1['10000']
- Error in `[.data.table`(prhistory, "10000") : typeof x.persid (integer) != typeof i.persid (character)
- setkey(tb1,persid)
- tb1[J(10000)]
- # persid date rating
- # 1: 10000 1/1/2014 A
- # 2: 10000 1/2/2014 B
- tb1[persid==10000]
- # persid date rating
- # 1: 10000 1/1/2014 A
- # 2: 10000 1/2/2014 B
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