1

ROWID = constant

2

Cluster join with unique or primary key = constant

3

Hash cluster key with unique or primary key = constant

4

Entire Unique concatenated index = constant

5

Unique indexed column = constant

6

Entire cluster key = corresponding cluster key of another table in the same cluster

7

Hash cluster key = constant

8

Entire cluster key = constant

9

Entire non-UNIQUE CONCATENATED index = constant

10

Non-UNIQUE index merge

11

Entire concatenated index = lower bound

12

Most leading column(s) of concatenated index = constant

13

Indexed column between low value and high value or indexed column LIKE "ABC%" (bounded range)

14

Non-UNIQUE indexed column between low value and high value or indexed column like `ABC%' (bounded range)

15

UNIQUE indexed column or constant (unbounded range)

16

Non-UNIQUE indexed column or constant (unbounded range)

17

Equality on non-indexed = column or constant (sort/merge join)

18

MAX or MIN of single indexed columns

19

ORDER BY entire index

20

Full table scans