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SQLite table constraint - unique on multiple columns
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Regex to match a digit two or four times
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Git search for string in a single file's history
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Combining a class selector and an attribute selector with jQuery
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linux tee is not working with python?
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Add a number to each selection in Sublime Text 2, incremented once per selection
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Remove a character from the end of a variable
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Should the .gradle folder be added to version control?
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Can I have multiple primary keys in a single table?
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Both Primary Key & Alternate keys can be Compound keys
Sources:
https://en.wikipedia.org/wiki/Superkey
https://en.wikipedia.org/wiki/Candidate_key
https://en.wikipedia.org/wiki/Primary_key
https://en.wikipedia.org/wiki/Compound_key
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Aggregate function in an SQL update query?
...st in the doc to get why FROM is considered by PostgreSQL as a self-join : https://www.postgresql.org/docs/9.5/static/sql-update.html#AEN89239
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