subpartitioning, 4680 subpartitions, 4680 known issues, 4719 subqueries, 2682 correlated, 2689 errors, 2697 in FROM clause (see derived tables) optimization, 1694, 1699 restrictions, 2698 with ALL, 2686 with ANY, IN, SOME, 2685 with EXISTS, 2688 with NOT EXISTS, 2688 with row constructors, 2687 subquery (see subqueries) subquery materialization, 1698 subselects, 2682 SUBSTR(), 2182 SUBSTRING(), 2182 SUBSTRING_INDEX(), 2182 SUBTIME(), 2163 subtraction (-), 2139 SUDO_USER environment variable, 4994 suffix option mysql_ssl_rsa_setup, 403 SUM(), 2404 SUM(DISTINCT), 2404 SUPER privilege, 1193 super-large-pages option mysqld, 755 superuser, 258 super_read_only system variable, 895 support for operating systems, 96, 96 for platforms, 96 supremum record, 6190 surrogate key, 6190 symbolic links, 1832, 1834 databases, 1833 tables, 1833 Windows, 1834 symbolic-links option mysqld, 756 synchronization of source and replica in NDB Cluster Replication, 4633 Syncing ndb table schema operation and binlog thread state, 1857 sync_binlog system variable, 3568 sync_frm removed features, 44 sync_master_info system variable, 3539 sync_relay_log system variable, 3539 sync_relay_log_info system variable, 3540 syntactically well-formed 5567