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