大约有 23,000 项符合查询结果（耗时：0.0306秒） [XML]
Only read selected columns
...160 110 3.9 2.875 17.02 0 1 4 4
3 22.8 4 108 93 3.85 2.32 18.61 1 1 4 1
> head(dbGetQuery(conn, "select mpg, gear from mtcars"), 3)
MPG GEAR
1 21 4
2 21 4
3 22.8 4
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SheharyarSheharyar
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