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Batch file to delete files older than N days
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For more goodies, refer to An A-Z Index of the Windows XP command line.
If you don't have forfiles installed on your machine, copy it from any Windows Server 2003 to your Windows XP machine at %WinDir%\system32\. This is possible since the EXE is fully compatible between Windows Server 2003 ...
Postgresql SELECT if string contains
...CT id FROM TAG_TABLE WHERE 'aaaaaaaa' ~ tag_name;
Worth reading through Difference between LIKE and ~ in Postgres to understand the difference.
`
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Get last element of Stream/List in a one-liner
...created from Lists). For unordered streams it is for obvious reasons unspecified which element will be returned.
The implementation works for both sequential and parallel streams. That might be surprising at first glance, and unfortunately the documentation doesn't state it explicitly. However, it ...
Deleting rows with MySQL LEFT JOIN
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You simply need to specify on which tables to apply the DELETE.
Delete only the deadline rows:
DELETE `deadline` FROM `deadline` LEFT JOIN `job` ....
Delete the deadline and job rows:
DELETE `deadline`, `job` FROM `deadline` LEFT JOIN `job` ....
In a javascript array, how do I get the last 5 elements, excluding the first element?
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You can call:
arr.slice(Math.max(arr.length - 5, 1))
If you don't want to exclude the first element, use
arr.slice(Math.max(arr.length - 5, 0))
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How to add 'ON DELETE CASCADE' in ALTER TABLE statement
...d try your above command, put add constraint instead of modify constraint.
Now this is the command:
ALTER TABLE child_table_name
ADD CONSTRAINT fk_name
FOREIGN KEY (child_column_name)
REFERENCES parent_table_name(parent_column_name)
ON DELETE CASCADE;
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Loading local JSON file
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In a more modern way, you can now use the Fetch API:
fetch("test.json")
.then(response => response.json())
.then(json => console.log(json));
All modern browsers support Fetch API. (Internet Explorer doesn't, but Edge does!)
source:
Using F...
How to get Erlang's release version number from a shell?
...E" doesn't see it either, but I have OTP 17.x installed. How am I able to know what "x" is?
– NobbZ
Apr 21 '15 at 14:30
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Showing empty view when ListView is empty
... any idea how to do that in app inventor?
– JinSnow
Mar 26 '15 at 16:56
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How does libuv compare to Boost/ASIO?
...t libraries available, I have opted to consider additional Boost libraries if they are either directly provided or trivial to implement.
libuv Boost
Event Loop: yes Asio
Threadpool: yes Asio + Threads
Threading: ...