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Fastest check if row exists in PostgreSQL
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Use the EXISTS key word for TRUE / FALSE return:
select exists(select 1 from contact where id=12)
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Linux command or script counting duplicated lines in a text file?
... 2 green
2 orange
3 apple
EDIT
Aha, this was NOT along word boundaries, my bad. Here's the command to use for full lines:
$> cat fruits.txt | sort | uniq -c | sort -nk1
1 oragen
1 red apple
2 green apple
2 orange
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Overflow:hidden dots at the end
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apologies, Im not sure how i removed your words like that!
– cela
May 28 '18 at 6:16
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Swift make method parameter mutable?
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inout keyword should be placed between parameter name and parameter type like this: func reduceToZero(x: inout Int) in current Swift 3 version.
– Agustí Sánchez
Sep 24 '16 at 8:59
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Pros and Cons of Interface constants [closed]
...oils down to, is how likely is there a need for other constants. In other words, is there a need to extend the ENUM provided by the constants on the interface. If you can foresee needing to expand it, then go with a more formal pattern. If not, then it may suffice (it'll be good enough, and hence...
Separators for Navigation
...dds the image to every list item that follows another list item - in other words all of them but the first.
NB. Be aware the adjacent selector (li + li) doesn't work in IE6, so you will have to just add the background image to the conventional li (with a conditional stylesheet) and perhaps apply a ...
Can I make a not submit a form?
...bmit the form.
<button type="button">Submit</button>
In the words of the HTML Standard: "Does nothing."
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Why check both isset() and !empty()
...set plus an additional check for the truthiness of a value.
Or in other words, empty is the same as !$foo, but doesn't throw warnings if the variable doesn't exist. That's the main point of this function: do a boolean comparison without worrying about the variable being set.
The manual puts it l...
How can you run a command in bash over until success
... everything worked ok, and non-zero if the passwd change failed (wrong password, password mismatch, etc...)
passwd
while [ $? -ne 0 ]; do
passwd
done
With your backtick version, you're comparing passwd's output, which would be stuff like Enter password and confirm password and the like.
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Understanding how recursive functions work
...ens to be the sum of all the integers between 3 and 5, inclusive. In other words, if you want to know the sum of all the integers between 2 and 5, start by computing the sum of all the integers between 3 and 5, then add 2.
So how do you compute the sum of all the integers between 3 and 5, inclusive...