boolean.sql

postgresql8.3.4源码,开源数据库

--
-- BOOLEAN
--

--
-- sanity check - if this fails go insane!
--
SELECT 1 AS one;


-- ******************testing built-in type bool********************

-- check bool type-casting as well as and, or, not in qualifications--

SELECT bool 't' AS true;

SELECT bool '   f           ' AS false;

SELECT bool 't' or bool 'f' AS true;

SELECT bool 't' and bool 'f' AS false;

SELECT not bool 'f' AS true;

SELECT bool 't' = bool 'f' AS false;

SELECT bool 't' <> bool 'f' AS true;

-- explicit casts to/from text
SELECT 'TrUe'::text::boolean AS true, 'fAlse'::text::boolean AS false;
SELECT '    true   '::text::boolean AS true,
       '     FALSE'::text::boolean AS false;
SELECT true::boolean::text AS true, false::boolean::text AS false;

SELECT '  tru e '::text::boolean AS invalid;    -- error
SELECT ''::text::boolean AS invalid;            -- error

CREATE TABLE BOOLTBL1 (f1 bool);

INSERT INTO BOOLTBL1 (f1) VALUES (bool 't');

INSERT INTO BOOLTBL1 (f1) VALUES (bool 'True');

INSERT INTO BOOLTBL1 (f1) VALUES (bool 'true');


-- BOOLTBL1 should be full of true's at this point 
SELECT '' AS t_3, BOOLTBL1.* FROM BOOLTBL1;


SELECT '' AS t_3, BOOLTBL1.*
   FROM BOOLTBL1
   WHERE f1 = bool 'true';


SELECT '' AS t_3, BOOLTBL1.* 
   FROM BOOLTBL1
   WHERE f1 <> bool 'false';

SELECT '' AS zero, BOOLTBL1.*
   FROM BOOLTBL1
   WHERE booleq(bool 'false', f1);

INSERT INTO BOOLTBL1 (f1) VALUES (bool 'f');

SELECT '' AS f_1, BOOLTBL1.* 
   FROM BOOLTBL1
   WHERE f1 = bool 'false';


CREATE TABLE BOOLTBL2 (f1 bool);

INSERT INTO BOOLTBL2 (f1) VALUES (bool 'f');

INSERT INTO BOOLTBL2 (f1) VALUES (bool 'false');

INSERT INTO BOOLTBL2 (f1) VALUES (bool 'False');

INSERT INTO BOOLTBL2 (f1) VALUES (bool 'FALSE');

-- This is now an invalid expression
-- For pre-v6.3 this evaluated to false - thomas 1997-10-23
INSERT INTO BOOLTBL2 (f1) 
   VALUES (bool 'XXX');  

-- BOOLTBL2 should be full of false's at this point 
SELECT '' AS f_4, BOOLTBL2.* FROM BOOLTBL2;


SELECT '' AS tf_12, BOOLTBL1.*, BOOLTBL2.*
   FROM BOOLTBL1, BOOLTBL2
   WHERE BOOLTBL2.f1 <> BOOLTBL1.f1;


SELECT '' AS tf_12, BOOLTBL1.*, BOOLTBL2.*
   FROM BOOLTBL1, BOOLTBL2
   WHERE boolne(BOOLTBL2.f1,BOOLTBL1.f1);


SELECT '' AS ff_4, BOOLTBL1.*, BOOLTBL2.*
   FROM BOOLTBL1, BOOLTBL2
   WHERE BOOLTBL2.f1 = BOOLTBL1.f1 and BOOLTBL1.f1 = bool 'false';


SELECT '' AS tf_12_ff_4, BOOLTBL1.*, BOOLTBL2.*
   FROM BOOLTBL1, BOOLTBL2
   WHERE BOOLTBL2.f1 = BOOLTBL1.f1 or BOOLTBL1.f1 = bool 'true'
   ORDER BY BOOLTBL1.f1, BOOLTBL2.f1;

--
-- SQL92 syntax
-- Try all combinations to ensure that we get nothing when we expect nothing
-- - thomas 2000-01-04
--

SELECT '' AS "True", f1
   FROM BOOLTBL1
   WHERE f1 IS TRUE;

SELECT '' AS "Not False", f1
   FROM BOOLTBL1
   WHERE f1 IS NOT FALSE;

SELECT '' AS "False", f1
   FROM BOOLTBL1
   WHERE f1 IS FALSE;

SELECT '' AS "Not True", f1
   FROM BOOLTBL1
   WHERE f1 IS NOT TRUE;

SELECT '' AS "True", f1
   FROM BOOLTBL2
   WHERE f1 IS TRUE;

SELECT '' AS "Not False", f1
   FROM BOOLTBL2
   WHERE f1 IS NOT FALSE;

SELECT '' AS "False", f1
   FROM BOOLTBL2
   WHERE f1 IS FALSE;

SELECT '' AS "Not True", f1
   FROM BOOLTBL2
   WHERE f1 IS NOT TRUE;

--
-- Clean up
-- Many tables are retained by the regression test, but these do not seem
--  particularly useful so just get rid of them for now.
--  - thomas 1997-11-30
--

DROP TABLE  BOOLTBL1;

DROP TABLE  BOOLTBL2;