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。还有,losal和hisal是什么?是宏?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。还有,losal和hisal是什么?是宏?谢谢!
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