index-name-1

One of the following actions applies:

• If index-name-1 is an index for identifier-1, this index is used for the search. Otherwise, the first (or only) index-name is used.

• If index-name-1 is an index for another table element, then the first (or only) index-name for identifier-1 is used for the search; the occurrence number represented by index-name-1 is increased by the same amount as the search index-name and at the same time.

When the VARYING index-name-1 phrase is omitted, the first (or only) index-name for identifier-1 is used for the search.

X If indexing is used to search a table without an INDEXED BY clause,
X correct results are ensured only if both the table defined with the
X index and the table defined without the index have table elements of
X the same length and with the same number of occurrences.

identifier-2

Must be either an index data item or an elementary integer item.
X Identifier-2 cannot be a windowed date field. Identifier-2 cannot be subscripted by the first (or only) index-name for identifier-1. During the search, one of the following actions applies:

• If identifier-2 is an index data item, then, whenever the search index is increased, the specified index data item is simultaneously increased by the same amount.

• If identifier-2 is an integer data item, then, whenever the search index is increased, the specified data item is simultaneously increased by 1.

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