The list of PostgreSQL reserved key words.
http://www.postgresql.org/docs/9.4/static/sql-keywords-appendix.html
protected $postgresqlReservedKeyWords = ['all', 'analyse', 'analyze', 'and', 'any', 'array', 'as', 'asc', 'asymmetric', 'authorization', 'binary', 'both', 'case', 'cast', 'check', 'collate', 'collation', 'column', 'concurrently', 'constraint', 'create', 'cross', 'current_catalog', 'current_date', 'current_role', 'current_schema', 'current_time', 'current_timestamp', 'current_user', 'default', 'deferrable', 'desc', 'distinct', 'do', 'else', 'end', 'except', 'false', 'fetch', 'for', 'foreign', 'freeze', 'from', 'full', 'grant', 'group', 'having', 'ilike', 'in', 'initially', 'inner', 'intersect', 'into', 'is', 'isnull', 'join', 'lateral', 'leading', 'left', 'like', 'limit', 'localtime', 'localtimestamp', 'natural', 'not', 'notnull', 'null', 'offset', 'on', 'only', 'or', 'order', 'outer', 'over', 'overlaps', 'placing', 'primary', 'references', 'returning', 'right', 'select', 'session_user', 'similar', 'some', 'symmetric', 'table', 'then', 'to', 'trailing', 'true', 'union', 'unique', 'user', 'using', 'variadic', 'verbose', 'when', 'where', 'window', 'with'];
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