test0.sql.svn-base

关于数据库编程范例

select * from r1, r2, r3 where a1 = 1 and a3 = 11 and a5 = 99;

select * from r1, r2 where r1.a1 = r2. a3;

select * from r1, r2, r3 where r1.a1 = r2. a3 and r2.a3 = r3.a5;