Entering content frame

 Search Conditions for Key Columns 

If the SQL statement contains search conditions for key columns, then the following search strategies are possible:

Search Condition

Search Strategy

Equality condition for every key column

The appropriate row(s) are accessed directly.

IN condition for one key column and an equality condition for all other key columns

The appropriate row(s) are accessed directly.

Range conditions

Upper and lower limits for the valid key range are created for the key columns. All search strategies, including strategies using inversions, use the knowledge of this valid search range.

 

 

Leaving content frame