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How to add a primary key to a MySQL table?
...s would define multiple primary keys. Im using InnoDB. Note I already have 3 of them.
– LMD
Jul 13 '18 at 18:27
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How can I disable ARC for a single file in a project?
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It is possible to disable ARC for individual files by adding the -fno-objc-arc compiler flag for...
How to replace (or strip) an extension from a filename in Python?
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edited Oct 30 '15 at 15:24
Austin Cory Bart
1,15611 gold badge1111 silver badges2424 bronze badges
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What Ruby IDE do you prefer? [closed]
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edited Dec 29 '09 at 10:35
community wiki
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Finding ALL duplicate rows, including “elements with smaller subscripts”
...ta frame is a duplicate of an element with a smaller subscript. So if rows 3, 4, and 5 of a 5-row data frame are the same, duplicated will give me the vector
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How do I use shell variables in an awk script?
...0;++i) print i"'
awk 'BEGIN {print "'"$variable"'"}'
line one
line two
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You can add lots of commands to awk this way. Even make it crash with non valid commands.
Extra info:
Use of double quote
It's always good to double quote variable "$variable"
If not, multiple lines will be...
What platforms have something other than 8-bit char?
...turned up for example in OMAP2. There are other DSPs out there with 16 and 32 bit char. I think I even heard about a 24-bit DSP, but I can't remember what, so maybe I imagined it.
Another consideration is that POSIX mandates CHAR_BIT == 8. So if you're using POSIX you can assume it. If someone late...
How can I recover a removed file in Mercurial (if at all)?
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First, use hg grep to find the deleted file you wish to recover. The output of this command wil...
PHP: exceptions vs errors?
...xceptions :-(
– DaveRandom
Sep 19 '13 at 11:45
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@DaveRandom E_NOTICE, E_WARNING are not "errors"...
MySQL Cannot drop index needed in a foreign key constraint
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You have to drop the foreign key. Foreign keys in MySQL automatically create an index on the t...