The CREATE VIEW command assigns a name to a pre-packaged
SELECT statement.
Once the view is created, it can be used in the FROM clause
of another SELECT in place of a table name.
If the "TEMP" or "TEMPORARY" keyword occurs in between "CREATE"
and "VIEW" then the view that is created is only visible to the
database connection that created it and is automatically deleted when
the database connection is closed.
If a schema-name is specified, then the view
is created in the specified database.
It is an error to specify both a schema-name
and the TEMP keyword on a VIEW, unless the schema-name
is "temp".
If no schema name is specified, and the TEMP keyword is not present,
the VIEW is created in the main database.
You cannot DELETE, INSERT, or UPDATE a view. Views are read-only
in SQLite. However, in many cases you can use an
INSTEAD OF trigger on the view to accomplish
the same thing. Views are removed
with the DROP VIEW command.
If a column-name list follows
the view-name, then that list determines
the names of the columns for the view. If the column-name
list is omitted, then the names of the columns in the view are derived
from the names of the result-set columns in the select-stmt.
The use of column-name list is recommended. Or, if
column-name list is omitted, then the result
columns in the SELECT statement that defines the view should have
well-defined names using the
"AS column-alias" syntax.
SQLite allows you to create views that depend on automatically
generated column names, but you should avoid using them since the
rules used to generate column names are not a defined part of the
interface and might change in future releases of SQLite.
The column-name list syntax was added in
SQLite versions 3.9.0 (2015-10-14).
