NOT NULL constraint, 6171 NOT REGEXP, 2191 not-started option ndb_waiter, 4432 notee command mysql, 435 NOTIFY_SOCKET environment variable, 199, 632 Not_flushed_delayed_rows status variable, 962 NOW(), 2160 NOWAIT, 2666 NOWAIT (START BACKUP command), 4492 nowait-nodes option ndbd, 4246 ndbmtd, 4246 ndb_mgmd, 4264 ndb_waiter, 4433 nowarning command mysql, 436 NO_AUTO_VALUE_ON_ZERO SQL mode, 973 NO_BACKSLASH_ESCAPES SQL mode, 973 NO_DIR_IN_CREATE SQL mode, 973 NO_ENGINE_SUBSTITUTION SQL mode, 973 NO_FIELD_OPTIONS removed features, 45 NO_GROUP_INDEX, 1799 NO_ICP, 1799 NO_INDEX, 1799 NO_INDEX_MERGE, 1799 NO_JOIN_INDEX, 1799 NO_KEY_OPTIONS removed features, 45 NO_MRR, 1799 NO_ORDER_INDEX, 1799 NO_RANGE_OPTIMIZATION, 1799 NO_SKIP_SCAN, 1799 NO_TABLE_OPTIONS removed features, 45 NO_UNSIGNED_SUBTRACTION SQL mode, 974 NO_ZERO_DATE SQL mode, 975 NO_ZERO_IN_DATE SQL mode, 975 NTH_VALUE(), 2422 NTILE(), 2422 NUL, 1860, 2645 NULL, 318, 5309, 6171 ORDER BY, 1682 testing for null, 2126, 2128, 2130, 2130, 2137 null literal JSON, 2069 NULL value, 318, 1869 ORDER BY, 1869 NULL values and AUTO_INCREMENT columns, 5310 and indexes, 2546 and TIMESTAMP columns, 5310 5494