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Computed / calculated / virtual / derived columns in PostgreSQL
...s defined in the SQL standard and implemented by some RDBMS including DB2, MySQL and Oracle. Nor the similar "computed columns" of SQL Server.
STORED generated columns are introduced with Postgres 12. Trivial example:
CREATE TABLE tbl (
int1 int
, int2 int
, product bigint GENERATED ALWAYS...
How to set up a PostgreSQL database in Django
...
isn't there anything like MySQL workbench for Postgres?
– Sidhin S Thomas
Jun 27 '17 at 13:40
1
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Getting Django admin url for an object
... urls.py file.
I had this in my urlpatterns:
(r'^admin/(.*)', admin.site.root),
which gets the admin screens working but is the deprecated way of doing it. I needed to change it to this:
(r'^admin/', include(admin.site.urls) ),
Once I did that, all the goodness that was promised in the Rever...
jQuery dot in ID selector? [duplicate]
...
Use the escaping rules from the jQuery selectors API as follows:
$('#root\\.SomeCoolThing')
From the docs:
To use any of the meta-characters (such as
!"#$%&'()*+,./:;<=>?@[\]^`{|}~) as a literal part of a name, it must
be escaped with with two backslashes: \\. For example...
iOS app error - Can't add self as subview
...Has no effect if navigationLock is not the current lock.
- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated navigationLock:(id)navigationLock; ///< Pops until there's only a single view controller left on the stack. Returns the popped controllers. Has no effect if navigationLock is not t...
How to change Rails 3 server default port in develoment?
...matically be run when you run "rails" with Rails 3 gems installed from the root of your application.
APP_PATH = File.expand_path('../../config/application', __FILE__)
require File.expand_path('../../config/boot', __FILE__)
# THIS IS NEW:
require "rails/commands/server"
module Rails
class Serve...
SQL - Update multiple records in one query
...
This is a MySQL solution, not Postgres or MSSQL.
– Rz Mk
Dec 23 '17 at 15:30
1
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Convert Base64 string to an image file? [duplicate]
...m.php-
'public_feeds' => [
'driver' => 'local',
'root' => public_path() . '/uploads/feeds',
],
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Count how many files in directory PHP
...nything to /path/to/dir would fail it, because first / means starting from root dir. If there were path/to/dir, then yes, __DIR__ . '/path/to/dir' would help (in this case you must use / after __DIR__
– Justinas
Feb 22 '19 at 14:30
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How to remove unreferenced blobs from my git repo
...s/folders from your git repository. To use
# it, cd to your repository's root and then run the script with a list of paths
# you want to delete, e.g., git-delete-history path1 path2
if [ $# -eq 0 ]; then
exit 0
fi
# make sure we're at the root of git repo
if [ ! -d .git ]; then
echo "Err...