Compares the universally unique identifiers (UUIDs) of two raster objects and returns true if the UUID of the first object is less than that of the second.
This operator compares UUIDs only—not spatial extents or pixel types. It is intended for internal database operations such as union and B-tree ordering, not for spatial comparison in application queries.
Syntax
bool Operator <(raster rast1, raster rast2)Parameters
| Parameter | Description |
|---|---|
rast1 |
The first raster object. |
rast2 |
The second raster object. |
Example
The following query compares the UUIDs of matched raster objects from two tables and returns true if the UUID of a.rast is less than that of b.rast.
SELECT a.rast < b.rast
FROM tbl_a a, tbl_b b
WHERE a.id = b.id