create_view.sql

来自「关系型数据库 Postgresql 6.5.2」· SQL 代码 · 共 21 行

--
-- VIRTUAL CLASS DEFINITIONS
--	(this also tests the query rewrite system)
--

CREATE VIEW street AS
   SELECT r.name, r.thepath, c.cname AS cname 
   FROM road r, real_city c
   WHERE c.outline ## r.thepath;

CREATE VIEW iexit AS
   SELECT ih.name, ih.thepath, 
	interpt_pp(ih.thepath, r.thepath) AS exit
   FROM ihighway ih, ramp r
   WHERE ih.thepath ## r.thepath;

CREATE VIEW toyemp AS
   SELECT name, age, location, 12*salary AS annualsal
   FROM emp;