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Computed / calculated / virtual / derived columns in PostgreSQL
...- as 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 ALW...
Free space in a CMD shell
... NicoNico
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What is the “__v” field in Mongoose
I'm using Mongoose version 3 with MongoDB version 2.2. I've noticed a __v field has started appearing in my MongoDB documents. Is it something to do with versioning? How is it used?
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Catch paste input
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ChrisF♦
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answered Oct 1 '09 at 11:35
Evgeni DimovE...
How do I view all commits for a specific day?
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Thanks John Bartholomew!
The answer is to specify the time, e.g. git log --after="2013-11-12...
What does ||= (or-equals) mean in Ruby?
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horizontal scrollbar on top and bottom of table
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To simulate a second horizontal scrollbar on top of an element, put a "dummy" div above the el...
How to count the number of files in a directory using Python
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How do you debug PHP scripts? [closed]
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edited Mar 2 '16 at 5:37
community wiki
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