请教:select first_name,salary,grade from s_emp
where salary(+) between losal and hisal;和
select first_name,salary,grade from s_emp from s_emp
where salary between losal(+) and hisal(+);中,外连接符号用法的区别。谢谢!
where salary(+) between losal and hisal;和
select first_name,salary,grade from s_emp from s_emp
where salary between losal(+) and hisal(+);中,外连接符号用法的区别。谢谢!
第二个是右链接!
一般左右连接是相对于表的关联的时候才有用