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--
-- CREATE_VIEW
-- Virtual class definitions
-- (this also tests the query rewrite system)
--
CREATE VIEW street AS
SELECT r.name, r.thepath, c.cname AS cname
FROM ONLY 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;
-- Test comments
COMMENT ON VIEW noview IS 'no view';
ERROR: relation "noview" does not exist
COMMENT ON VIEW toyemp IS 'is a view';
COMMENT ON VIEW toyemp IS NULL;
--
-- CREATE OR REPLACE VIEW
--
CREATE TABLE viewtest_tbl (a int, b int);
COPY viewtest_tbl FROM stdin;
CREATE OR REPLACE VIEW viewtest AS
SELECT * FROM viewtest_tbl;
CREATE OR REPLACE VIEW viewtest AS
SELECT * FROM viewtest_tbl WHERE a > 10;
SELECT * FROM viewtest;
a | b
----+----
15 | 20
20 | 25
(2 rows)
CREATE OR REPLACE VIEW viewtest AS
SELECT a, b FROM viewtest_tbl WHERE a > 5 ORDER BY b DESC;
SELECT * FROM viewtest;
a | b
----+----
20 | 25
15 | 20
10 | 15
(3 rows)
-- should fail
CREATE OR REPLACE VIEW viewtest AS
SELECT a FROM viewtest_tbl WHERE a <> 20;
ERROR: cannot change number of columns in view
-- should fail
CREATE OR REPLACE VIEW viewtest AS
SELECT 1, * FROM viewtest_tbl;
ERROR: cannot change number of columns in view
-- should fail
CREATE OR REPLACE VIEW viewtest AS
SELECT a, b::numeric FROM viewtest_tbl;
ERROR: cannot change data type of view column "b"
DROP VIEW viewtest;
DROP TABLE viewtest_tbl;
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