Jeremy questions

Jeremy answers

• psql: warning: extra command-line argument "from" ignored
• PostgreSQL group by without aggregate function. Why does it work?
• Performance impact of adding unique constraint to existing postgres index
• How to use LAST_VALUE in PostgreSQL?
• How do I pass an environment variable into a .sql file?
• Mock out angular.element in Jasmine tests
• Unnest multi dimensional array by one level in Postgresql
• Why do I get empty response for regexp_matches function while using positive lookahead (?=...)
• Trigger | how to delete row instead of update based on cell value