Database sorts, filters and ranges
We can query the database in a variety
of ways. The more specific and limited the request is, the slower
the retrieval time, yet the more focused the request can be. As
a user, what matters is whether you want to retrieve one image
at a time, or a group of images.
- If you want to put the entire database in
a particular order, you SORT the database by index points. Using
any index sorts the database. Not all fields in the database
- If you want to identify a subset of the database
by an indexed range of values such as date or a specific field
and its value, you SET A RANGE. These ranges are alternative
to each other; that is, you use one or the other, but cannot
use both, and using one cancels the other. Dates and fields
are indexes in the system, so using these to identify a group
of records is particularly efficient and quick for the system.
- If you want the system to examine every record
in a range and locate a specific subset of that range, you apply
a secondary FILTER to the database.
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