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Turn off constraints temporarily (MS SQL)
... believe the ANSI standard setting, which means you shouldn't use them for strings. Has nothing to do with being consistent. see stackoverflow.com/questions/1992314/…
– kevinc
Oct 8 '16 at 11:49
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Remove an element from a Bash array
...$delete}
pippo
$ array=( "${array[@]/$delete}" ) #Quotes when working with strings
If need to delete more than one element:
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$ delete=(pluto pippo)
for del in ${delete[@]}
do
array=("${array[@]/$del}") #Quotes when working with strings
done
Caveat
This technique actually removes prefixes...
SQL RANK() versus ROW_NUMBER()
...rows that have duplicate values,in which case the same ranking is assigned and a gap appears in the sequence for each duplicate ranking.
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Facebook database design?
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Keep a friend table that holds the UserID and then the UserID of the friend (we will call it FriendID). Both columns would be foreign keys back to the Users table.
Somewhat useful example:
Table Name: User
Columns:
UserID PK
EmailAddress
Password
Ge...
Select random row from a sqlite table
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Have a look at Selecting a Random Row from an SQLite Table
SELECT * FROM table ORDER BY RANDOM() LIMIT 1;
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Convert duration to hours:minutes:seconds (or similar) in Rails 3 or Ruby
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Ruby's string % operator is too unappreciated and oft forgotten.
"%02d:%02d:%02d:%02d" % [t/86400, t/3600%24, t/60%60, t%60]
Given t is a duration in seconds, this emits a zero-padded colon-separated string including days. Exampl...
Unix command to prepend text to a file
Is there a Unix command to prepend some string data to a text file?
16 Answers
16
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JOIN queries vs multiple queries
Are JOIN queries faster than several queries? (You run your main query, and then you run many other SELECTs based on the results from your main query)
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Replace a value if null or undefined in JavaScript
... If anything falsey is a potentially valid input (0, false, empty string), I would do something like this instead: var j = (i === null) ? 10 : i; Which will only replace null, rather than anything that can be evaluated to false.
– DBS
Sep 26 '16 at 11:...
js中int和string互换（js int转string，js string转int） - 更多技术 - 清...
js中int和string互换（js int转string，js string转int）js-int-string-interchangeJavascript 本身就是弱类型的语言，通常情况下，不用自己刻意去转。若需要转换的话，可以使用toString()、parseInt()函数等。Javascript 本身就是弱类型的语言，通常情...