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--
-- SUBSELECT
--
SELECT 1 AS one WHERE 1 IN (SELECT 1);
SELECT 1 AS zero WHERE 1 NOT IN (SELECT 1);
SELECT 1 AS zero WHERE 1 IN (SELECT 2);
-- Set up some simple test tables
CREATE TABLE SUBSELECT_TBL (
f1 integer,
f2 integer,
f3 float
);
INSERT INTO SUBSELECT_TBL VALUES (1, 2, 3);
INSERT INTO SUBSELECT_TBL VALUES (2, 3, 4);
INSERT INTO SUBSELECT_TBL VALUES (3, 4, 5);
INSERT INTO SUBSELECT_TBL VALUES (1, 1, 1);
INSERT INTO SUBSELECT_TBL VALUES (2, 2, 2);
INSERT INTO SUBSELECT_TBL VALUES (3, 3, 3);
INSERT INTO SUBSELECT_TBL VALUES (6, 7, 8);
INSERT INTO SUBSELECT_TBL VALUES (8, 9, NULL);
SELECT '' AS eight, * FROM SUBSELECT_TBL;
-- Uncorrelated subselects
SELECT '' AS two, f1 AS "Constant Select" FROM SUBSELECT_TBL
WHERE f1 IN (SELECT 1);
SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL);
SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE
f2 IN (SELECT f1 FROM SUBSELECT_TBL));
SELECT '' AS three, f1, f2
FROM SUBSELECT_TBL
WHERE (f1, f2) NOT IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL
WHERE f3 IS NOT NULL);
-- Correlated subselects
SELECT '' AS six, f1 AS "Correlated Field", f2 AS "Second Field"
FROM SUBSELECT_TBL upper
WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE f1 = upper.f1);
SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
FROM SUBSELECT_TBL upper
WHERE f1 IN
(SELECT f2 FROM SUBSELECT_TBL WHERE CAST(upper.f2 AS float) = f3);
SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
FROM SUBSELECT_TBL upper
WHERE f3 IN (SELECT upper.f1 + f2 FROM SUBSELECT_TBL
WHERE f2 = CAST(f3 AS integer));
SELECT '' AS five, f1 AS "Correlated Field"
FROM SUBSELECT_TBL
WHERE (f1, f2) IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL
WHERE f3 IS NOT NULL);
--
-- Use some existing tables in the regression test
--
SELECT '' AS eight, ss.f1 AS "Correlated Field", ss.f3 AS "Second Field"
FROM SUBSELECT_TBL ss
WHERE f1 NOT IN (SELECT f1+1 FROM INT4_TBL WHERE f1 != ss.f1);
select q1, float8(count(*)) / (select count(*) from int8_tbl)
from int8_tbl group by q1 order by q1;
--
-- Test cases to catch unpleasant interactions between IN-join processing
-- and subquery pullup.
--
select count(*) from
(select 1 from tenk1 a
where unique1 IN (select hundred from tenk1 b)) ss;
select count(distinct ss.ten) from
(select ten from tenk1 a
where unique1 IN (select hundred from tenk1 b)) ss;
select count(*) from
(select 1 from tenk1 a
where unique1 IN (select distinct hundred from tenk1 b)) ss;
select count(distinct ss.ten) from
(select ten from tenk1 a
where unique1 IN (select distinct hundred from tenk1 b)) ss;
--
-- Test case to catch problems with multiply nested sub-SELECTs not getting
-- recalculated properly. Per bug report from Didier Moens.
--
CREATE TABLE orderstest (
approver_ref integer,
po_ref integer,
ordercancelled boolean
);
INSERT INTO orderstest VALUES (1, 1, false);
INSERT INTO orderstest VALUES (66, 5, false);
INSERT INTO orderstest VALUES (66, 6, false);
INSERT INTO orderstest VALUES (66, 7, false);
INSERT INTO orderstest VALUES (66, 1, true);
INSERT INTO orderstest VALUES (66, 8, false);
INSERT INTO orderstest VALUES (66, 1, false);
INSERT INTO orderstest VALUES (77, 1, false);
INSERT INTO orderstest VALUES (1, 1, false);
INSERT INTO orderstest VALUES (66, 1, false);
INSERT INTO orderstest VALUES (1, 1, false);
CREATE VIEW orders_view AS
SELECT *,
(SELECT CASE
WHEN ord.approver_ref=1 THEN '---' ELSE 'Approved'
END) AS "Approved",
(SELECT CASE
WHEN ord.ordercancelled
THEN 'Cancelled'
ELSE
(SELECT CASE
WHEN ord.po_ref=1
THEN
(SELECT CASE
WHEN ord.approver_ref=1
THEN '---'
ELSE 'Approved'
END)
ELSE 'PO'
END)
END) AS "Status",
(CASE
WHEN ord.ordercancelled
THEN 'Cancelled'
ELSE
(CASE
WHEN ord.po_ref=1
THEN
(CASE
WHEN ord.approver_ref=1
THEN '---'
ELSE 'Approved'
END)
ELSE 'PO'
END)
END) AS "Status_OK"
FROM orderstest ord;
SELECT * FROM orders_view;
DROP TABLE orderstest cascade;
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