Relačná algebra

HELP – Lists all user tables,indexes and views that exist in the database. (Specific Gateways may not support index and/or view information.)
HELP * – Prints general information about all tables, indexes, & views in database. (Specific Gateways may not suppor index and/or view information.)
HELP sql_statement – Prints information on the specified sql_statement.

HELP {tablename | viewname | indexname} – Prints general information about the specified table, view, or index. (Specific Gateways may not support index and/or view information.)

HELP HELP – Prints this information.

HELP INDEX indexname {,indexname} – Prints detailed information about the specified index(es). (Specific Gateways may not support index
information.)

HELP INTEGRITY tablename {,tablename} – Prints current integrity constraints on specified table(s). This is not supported by Open SQL.

HELP PERMIT tablename {,tablename} – Prints permissions on specified table(s). This is not supported by Open SQL.

HELP PERMIT ON [ DBEVENT | PROCEDURE] – Prints permissions on specified object_name {, object_name} dbevents or database procedures. This is not supported by OPEN SQL.

HELP PROCEDURE proc_name {, proc_name} – Prints description of the specified procedure(s). This is not supported by Open SQL.

HELP REGISTER linkname {,linkname} – Prints registration information
on specified table(s). This command is only available with INGRES/STAR or Gateways.

HELP RULE rulename {,rulename} – Prints description of the specified
rule(s). This command may not be available on your system, and it is not supported by Open SQL.