| 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]?