Q

QName functions, XPath scripting language , 287

queries, relational database tables.

See also XQuery language

density expression calculation, 102

discussed, 88

field headers, 91

field name changes, 101102

joins

merged records, 104107

natural, 107

precedence

in expressions, 9899

in SQL, 9598

record sorting order, 100

records, returning from multiple, 115

simple writing example, 8992

subqueries

AS clause in, 114115

correlated, 112

defined, 88, 110

INSERT command, 120

nested, 110

record changes, 114115

sorting order, 114

UPDATE command, 120

uses for, 111

values returned by, 112

summarized records, 102104

unwanted records, filtering out, 9295

query() method, 169 , 186