查人人中国名人网自动设计发型的app:SQL：很简单的问题，请问最后一排的星号是什么意思？
来源：百度文库 编辑：查人人中国名人网 时间：2024/05/03 07:54:40
SELECT S.Ename, E.EName
FROM EMPLOYEE S, EMPLOYEE E
WHERE E.SuperSSN =* S.SSN
全题如下
For each employee, list the employee name and his/her manager (if any)
SELECT S.Ename, E.EName
FROM EMPLOYEE S, EMPLOYEE E
WHERE E.SuperSSN =* S.SSN
Given:
EMPLOYEE [ENAME, SSN, BDATE, ADDRESS, SEX, SALARY, SUPERSSN, DNUMBER]
FROM EMPLOYEE S, EMPLOYEE E
WHERE E.SuperSSN =* S.SSN
全题如下
For each employee, list the employee name and his/her manager (if any)
SELECT S.Ename, E.EName
FROM EMPLOYEE S, EMPLOYEE E
WHERE E.SuperSSN =* S.SSN
Given:
EMPLOYEE [ENAME, SSN, BDATE, ADDRESS, SEX, SALARY, SUPERSSN, DNUMBER]
很简单的问题,你还来问??
*号在里面是个通配符的作用 可代替S前的所有字符信息