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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
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Java: difference between strong/soft/weak/phantom reference
...now the object to which it pointed is dead.
This text was extracted from: https://weblogs.java.net/blog/2006/05/04/understanding-weak-references
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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...ons that might occur.
Cross-posting from another answer I gave yesterday (https://stackoverflow.com/a/44395983/2156909)
SQLAlchemy supports ON CONFLICT now with two methods on_conflict_do_update() and on_conflict_do_nothing():
Copying from the documentation:
from sqlalchemy.dialects.postgresql i...
Defining custom attrs
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Is it possible to get CMake to build both a static and shared version of the same library?
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Java heap terminology: young, old and permanent generations?
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design a stack such that getMinimum( ) should be O(1)
... public int getMin() {
return (int)min;
}
}
Credit goes to: https://leetcode.com/discuss/15679/share-my-java-solution-with-only-one-stack
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Python circular importing?
... this issue from Django, you should know that the docs provide a solution:
https://docs.djangoproject.com/en/1.10/ref/models/fields/#foreignkey
"...To refer to models defined in another application, you can explicitly specify a model with the full application label. For example, if the Manufacturer...
The difference between fork(), vfork(), exec() and clone()
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Is it necessary to write HEAD, BODY and HTML tags?
...es <html>, <head>, <body>, <p> and <li>.
https://google.github.io/styleguide/htmlcssguide.html#Optional_Tags
For file size optimization and scannability purposes, consider
omitting optional tags. The HTML5 specification defines what tags can
be omitted.
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