lseg.sql

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

--
-- LSEG
-- Line segments
--

--DROP TABLE LSEG_TBL;
CREATE TABLE LSEG_TBL (s lseg);

INSERT INTO LSEG_TBL VALUES ('[(1,2),(3,4)]');
INSERT INTO LSEG_TBL VALUES ('(0,0),(6,6)');
INSERT INTO LSEG_TBL VALUES ('10,-10 ,-3,-4');
INSERT INTO LSEG_TBL VALUES ('[-1e6,2e2,3e5, -4e1]');
INSERT INTO LSEG_TBL VALUES ('(11,22,33,44)');

-- bad values for parser testing
INSERT INTO LSEG_TBL VALUES ('(3asdf,2 ,3,4r2)');
INSERT INTO LSEG_TBL VALUES ('[1,2,3, 4');
INSERT INTO LSEG_TBL VALUES ('[(,2),(3,4)]');
INSERT INTO LSEG_TBL VALUES ('[(1,2),(3,4)');

select * from LSEG_TBL;

SELECT * FROM LSEG_TBL WHERE s <= lseg '[(1,2),(3,4)]';

SELECT * FROM LSEG_TBL WHERE (s <-> lseg '[(1,2),(3,4)]') < 10;