index_U

U

Undirected learning, 475

Unstable indexes, 246–47

checking for, 246–47

rebuilding, 247

Unsupervised learning, 475

Usage patterns, 15

User-defined aggregates, 125–27

defined, 125–26

in extensibility framework, 126

implementation, 127

ODCIAggregate interface, 126

SalesForecast() function, 126–27

See also SQL functions

USER_EXTERNAL_TABLES dictionary view, 251