SQLite接受SQL语法中不存在的连接类型

Question

我发现SQLite有这种意外的行为。看来，SQLite接受SQL连接语法中的任意关键字。如果我不小心键入中立加入而不是自然加入笛卡尔产品生产。这是预期的行为，功能还是错误？

select count(*) from pri; -- 22 
select count(*) from sec; -- 57458 

select count(*) from pri natural join sec; -- 57458 
select count(*) from pri nautral join sec; -- 1264076 
select count(*) from pri advanced natural join sec; -- 57458 
select count(*) from pri imaginary join sec; -- 1264076 

在Debian 6.0和SQLite 3.7.5测试使用SQLite 3.7.3在Windows 7

补充：SQLite是数据库软件的佳作，我建议从小型到中型项目。这里是my brief SQLite vs PostgreSQL comparison.

Answer 1

nautral和imaginary被解析为别名表：

select count(*) from (pri) natural join sec; -- 57458 
select count(*) from (pri AS nautral) join sec; -- 1264076 
select count(*) from (pri AS advanced) natural join sec; -- 57458 
select count(*) from (pri AS imaginary) join sec; -- 1264076