layout | author | title | revision | version | description |
---|---|---|---|---|---|
default |
mattmc3 |
Modern SQL Style Guide |
2019-01-17 |
1.0.1 |
A guide to writing clean, clear, and consistent SQL. |
1.) If I have a data.frame df <- data.frame(a = c(1, 2, 3), b = c(4, 5, 6), c(7, 8, 9))
...
1a.) How do I select the c(4, 5, 6)
?
1b.) How do I select the 1
?
1c.) How do I select the 5
?
1d.) What is df[, 3]
?