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How to easily specify column alias when performing a JOIN
I have to use an SQL statement that looks like this:
SELECT * FROM table1 AS a JOIN table2 AS b ON a.X = b.Y
and I want to know how I can specify an alias for "a" or "b" within the query.
Is there some kind of template for that? Like if I had
SELECT * FROM table1 AS a, table2 AS b ON a.X = b.Y
SELECT * FROM table1 AS b, table2 AS a ON a.X = b.Y
Or do I have to pre-type the whole thing into my text editor?
Actually you have to pre-type the whole thing. It's possible to use some kind of auto-completion to generate the right SQL, but you still have to type it all. See e.g. this.
R: Apply function to all entries in vector
I have a dataframe of people's age and whether they have a high-school diploma or not. I want to create a new column that looks like this:
1 25.5 TRUE
2 25.5 FALSE
3 24 TRUE
4 21 FALSE
I know this can be done with apply or ave but they do not work here (it looks like the vector that they pass does not align with the df).