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Nullable Foreign Key bad practice?
...n up incomplete orders:
SELECT * FROM `orders`
WHERE `started_time` < (UNIX_TIMESTAMP() + 900) AND `customer_id` IS NULL
The above would show orders older than 15 minutes without a related customer ID.
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Can't su to user jenkins after installing Jenkins
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What is the “right” JSON date format?
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The Unix timestamp is always UTC, you convert from your local timezone before generating the timestamp, and back again to the local timezone on display, there is no ambiguity there.
– lkraider
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Implement touch using Python?
touch is a Unix utility that sets the modification and access times of files to the current time of day. If the file doesn't exist, it is created with default permissions.
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Recursive directory listing in DOS
...TR. You can also use the excellent unxutils, but it converts the output to UNIX by default, so you no longer get CR+LF; FINDSTR offers the best Windows option.
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PostgreSQL: Modify OWNER on all tables simultaneously in PostgreSQL
... I preferred this as it works from within plsql once logged in - the unix level scripts (currently favourite answer) require a "-U postgres" and password entry in my environment.
– Dazed
Apr 30 '15 at 8:57
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How to flush output of print function?
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If you're running it on Linux/Unix platform, you can add the -u in the interpreter command line (first line of the script file), so change the first line from (something like) #!/usr/bin/python3 to #!/usr/bin/python3 -u - now when you run your script (e.g...
Why does Java's hashCode() in String use 31 as a multiplier?
...h words (formed as the union of the word lists provided in two variants of Unix) that using the constants 31, 33, 37, 39, and 41 will produce fewer than 7 collisions in each case. This may be the reason that so many Java implementations choose such constants.
See section 9.2 Hash Tables (page 522) o...
Using Git, show all commits that are in one branch, but not the other(s)
...te, this definitely won't work. In that case, you may just want to use the unix diff utility to compare the various files. Or, you could create a temporary branch and squash all the commits in that similar to what you did with the original branch, and then use this, which I think would work.
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How do I run a node.js app as a background service?
...ar/www/myapp
[Install]
WantedBy=multi-user.target
Note if you're new to Unix: /var/www/myapp/app.js should have #!/usr/bin/env node on the very first line.
Copy your service file into the /etc/systemd/system.
Start it with systemctl start myapp.
Enable it to run on boot with systemctl enable...