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How to sort a dataframe by multiple column(s)
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For me it comes down to the fact that arrange() is completely declarative, dd[order(-z, b)] is not.
– Mullefa
May 29 '15 at 13:12
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How to change collation of database, table, column?
...; in "Table options" section >> you can pick Collation from the drop down list >> and once you press {Go} at the top of the screen you will see a message:
Your SQL query has been executed successfully
and a script
ALTER TABLE `tableName` CONVERT TO CHARACTER SET utf8 COLLATE ut...
How to comment out a block of Python code in Vim
...e you want to modify, press ctrl-v to enter visual block mode, press j (or down arrow) to highlight all lines to modify, press l (or right arrow) to highlight a 2-char width (press once per column to highlight), and then press d to delete the highlighted text.
– thinkmassive
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Override valueof() and toString() in Java enum
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I've received a couple of down-votes on this answer - anyone care to expand on why this answer is bad? I'm just curious what people are thinking.
– pedorro
May 7 '15 at 22:17
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Using an ORM or plain SQL? [closed]
... the appropriate objects with ibatis and then pass them all the way up and down the stack. Some purists might argue this is Bad™. Maybe so (in theory) but I tell you what: it would've led to simpler code, a simpler stack and more productivity.
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jQuery Ajax POST example with PHP
... work with jQuery 1.8 and later, but it should work with previous versions down to jQuery 1.5.
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Inner join vs Where
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Amen brother. Down with the JOINERS!!
– ScottCher
Oct 27 '08 at 18:55
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Postgres and Indexes on Foreign Keys and Primary Keys
...gn key columns, it isn't required. Each index you add slows DML operations down slightly, so you pay a performance cost on every INSERT, UPDATE or DELETE. If the index is rarely used it may not be worth having.
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Circle-Rectangle collision detection (intersection)
... circle and the center of the rectangle. This collapses the four quadrants down into one, so that the calculations do not have to be done four times. The image shows the area in which the center of the circle must now lie. Note that only the single quadrant is shown. The rectangle is the grey area, ...
What's the difference between the atomic and nonatomic attributes?
...mic prevents cross-thread half-value reads. (That was a fun bug to track down.)
– bbum
Nov 23 '13 at 23:19
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