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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...S } AS IDENTITY PRIMARY KEY;
For an explanation of identity columns, see https://blog.2ndquadrant.com/postgresql-10-identity-columns/.
For the difference between GENERATED BY DEFAULT and GENERATED ALWAYS, see https://www.cybertec-postgresql.com/en/sequences-gains-and-pitfalls/.
For altering the ...
How do you delete an ActiveRecord object?
...on condition
threshold_age = 20
User.where(age: threshold_age).delete_all
https://www.rubydoc.info/docs/rails/ActiveRecord%2FNullRelation:delete_all
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Mongo interface [closed]
... use MongoHQ's web interface (even if you your MongoDB isn't on MongoHQ.)
https://mongohq.com/home
Mac OS X
While MongoHub had been a decent option for a while it's bugs make it virtually unusable at this point ...
There is a more up-to-date (and less buggy) fork of the MongoHub project availab...
How can I combine hashes in Perl?
... Hashes
websearch://perlfaq "merge two hashes"
websearch://perl merge hash
https://metacpan.org/pod/Hash::Merge
Footnotes
1 * (aka associative-array, aka dictionary)
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Scheduling recurring task in Android
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Cross-platform way of getting temp directory in Python
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Aligning a float:left div to center?
...
Perhaps this what you're looking for - https://www.w3schools.com/css/css3_flexbox.asp
CSS:
#container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.block {
width: 150px;
height: ...
IISExpress Log File Location
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What are all the possible values for HTTP “Content-Type” header?
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How to create your own library for Android development to be used in every program you write?
...wanted to use the Pull To Refresh library by Chrisbanes at Github.com here https://github.com/chrisbanes/Android-PullToRefresh/tree/master/library. The library's structure is in the form of an Android app. It has the form like below:
res/
src/
AndroidManifest.xml
pom.xml
project.properties
How to...