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php is null or empty?
...rovide an example of using simple comparison instead of these NULL empty() etc.
– Naeem Ul Wahhab
Jan 24 '18 at 19:15
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How to extract year and month from date in PostgreSQL without using to_char() function?
...to truncate off the day (or whatever else you want, e.g., week, year, day, etc..)
Example of grouping sales from orders by month:
select
SUM(amount) as sales,
date_trunc('month', created_at) as date
from orders
group by date
order by date DESC;
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Remove DEFINER clause from MySQL Dumps
...corruption or partial content in situations where disk space is exhausted, etc."
– Chad
Jan 13 at 22:13
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mysqldump - Export structure only without autoincrement
...at this also drops any auto increment fields, drop tables, character sets, etc.
– Deanna
Oct 8 '15 at 13:02
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How can I change the image displayed in a UIImageView programmatically?
...c, I can't see any hints about programmatically changing it. Do I have to fetch an UIImage object from that UIImageView ?
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Removing viewcontrollers from navigation stack
... a number")
There a bunch of more possible actions like removeFirst,range etc.
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Remove blank lines with grep
...rt of line
[[:space:]] match whitespace- spaces, tabs, carriage returns, etc.
* previous match (whitespace) may exist from 0 to infinite times
$ match end of line
Running the code-
$ echo "
> hello
>
> ok" |
> grep -v "^[[:space:]]*$"
hello
ok
To und...
How to execute a function when page has fully loaded?
... window.onload event will fire when everything is loaded, including images etc.
You would want to check the DOM ready status if you wanted your js code to execute as early as possible, but you still need to access DOM elements.
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Why is there no Tree class in .NET?
...plications that .NET is usually used for (business apps, data-moving apps, etc.). Still, I agree with you, it is strange that the BCL has no implementation at all.
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How to use java.String.format in Scala?
I am trying to use a .format method of a string. But if I place %1, %2, etc. in the string, java.util.UnknownFormatConversionException is thrown pointing to a confusing Java source code piece:
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