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Returns the name of the indexed column.
INDEX_COL ( table-name, index-id, key_# [ , user-id ] )
index-id The index ID of an index of table-name.
key_# A key in the index specified by index-id. This parameter specifies the column number in the index. For a single column index, key_# is equal to 0. For a multicolumn index, key_# is equal to 0 for the first column, 1 for the second column, and so on.
user-id The user ID of the owner of table-name. If user-id is not specified, this value defaults to the caller’s user ID.
