csql1.sql

b树实现源码,linux和unix下运行,速度快,极好用

echo create table and constraints with integer fields;
create table t1 (f1 int, f2 int);
insert into t1 values (10, 20);
insert into t1 (f1, f2) values (11, 21);
insert into t1 (f2, f1) values (22, 12);
insert into t1 (f1) values (13);
insert into t1 (f2) values (24);
select * from t1;
create table t2 (f1 int not null, f2 int);
insert into t2 values (10, 20);
insert into t2 (f1, f2) values (11, 21);
insert into t2 (f2, f1) values (22, 12);
insert into t2 (f1) values (13);
insert into t2 (f2) values (24);
select * from t2;
create table t3 (f1 int, f2 int, primary key(f1));
insert into t3 values (10, 20);
insert into t3 (f1, f2) values (11, 21);
insert into t3 (f2, f1) values (22, 12);
insert into t3 (f1) values (13);
insert into t3 (f2) values (24);
insert into t3 values (100, NULL);
update t3 set f2=NULL where f1=10;
delete from t3 where f2=NULL;
select * from t3;
drop table t1;
drop table t2;
drop table t3;