HELP COLUMN and Indexes
If the column for which information is requested defines a single‑column index, then that is reported along with the uniqueness and type of index. HELP COLUMN returns index information for single‑column indexes only. For multiple‑column indexes, the columns are reported as not being used in an index.
HELP COLUMN does not provide information about whether a column is used in the partitioning expression of a partitioned primary index. Use SHOW TABLE (see “SHOW object” on page 993) or the system view DBC.IndexConstraintsV (see Data Dictionary for further information) to obtain the partitioning information.
HELP COLUMN returns the information indicated in “HELP COLUMN Information and Attributes” on page 909.