parse.sql
上传用户:blenddy
上传日期:2007-01-07
资源大小:6495k
文件大小:1k
- ---------------------------------------------------------------------------
- --
- -- parse.sql-
- -- checks the parser
- --
- --
- -- Copyright (c) 1994, Regents of the University of California
- --
- -- $Id: parse.sql,v 1.1.1.1 1996/07/09 06:22:30 scrappy Exp $
- --
- ---------------------------------------------------------------------------
- create table foo (x int4, y int4, z int4);
- create table bar (x int4, y int4, z int4);
- create table baz (a int4, b int4);
- insert into foo values (1, 2, 3);
- insert into foo values (4, 5, 6);
- insert into foo values (7, 8, 9);
- insert into bar values (11, 12, 13);
- insert into bar values (14, 15, 16);
- insert into bar values (17, 18, 19);
- insert into baz values (99, 88);
- insert into baz values (77, 66);
- -- once upon a time, this becomes a join of foo and f:
- select * from foo f where f.x = 4;
- select * from foo f, foo where f.x > foo.x;
- select * from foo f, foo where f.x = 1 and foo.z > f.z;
- -- not standard SQL, POSTQUEL semantics
- -- update foo set x = f.x from foo f where foo.x = 1 and f.x = 7
- -- select * from foo
- -- fix error message:
- --select foo.x from foo,bar,baz where foo.x=bar.x and bar.y=baz.x and baz.x=foo.x
- -- see if renaming the column works
- select y as a, z as b from foo order by a;
- select foo.y as a, foo.z as b from foo order by b;
- -- column expansion
- select foo.*, bar.z, baz.* from foo, bar, baz;
- drop table foo, bar, baz;