当前位置: X题卡 > 所有题目 > 题目详情

设有一学生关系:S(XH,XM,XB,NL,DP)。在这个关系中,XH表示学号,XM表示姓名,NL表示年龄,DP表示系部。查询学生姓名和所在系这两个属性上的投影操作的关系运算式是 【8】 。

查看本题答案

你可能感兴趣的试题

SELECT XM,XB FROM STUD WHERE SD IN('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT IN ('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT IN(IS,MA,CS);  
SELECT XM,XB FROM STUD WHERE SD IN('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT IN ('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT IN(IS,MA,C;  
SELECT XM,XB FROM STUD WHERE SD IN("IS","MA","CS")  SELECT XM,XB FROM STUD WHERE SD NOT IN("IS","MA","CS")  SELECT XM,XB FROM STUD WHERE SD NOT("IS","MA","CS")  SELECT XM,XB FROM STUD WHERE SD NOT IN(IS,MA,C  
SELECT XM, XB FROM STUD WHERE SD IN ('IS','MA','CS');  SELECT XM, XB FROM STUD WHERE SD NOT 1N ('IS','MA','CS');  SELECT XM, XB FROM STUD WHERE SD NOT ('IS','MA','CS')  SELECT XM, XB FROM STUD WHERE SD NOT IN (IS, MA, C;  
SELECT XM,XB FROM STUD WHERE SD IN("IS","MA","CS")  SELECT XM,XB FROM STUD WHERE SD NOT IN("IS","MA","CS")  SELECT XM,XB FROM STUD WHERE SD NOT("IS","MA","CS")  SELECT XM,XB FROM STUD WHERE SD NOT IN(IS,MA,CS)  
SELECT XM,XB FROM STUD WHERE SD IN ('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SDNOTIN ('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT ('IS','MA','CS');  SELECT XM,XB FROM STUD WHERE SD NOT IN (IS,MA,C;  
SELECT XM.XB FROM STUD WHERE SD IN ("IS","MA","CS")  SELECT XM.XB FROM STID WHERE SD NOT IN("IS","MA","CS")  SELECT XM.XB FROM STUD WHERE SD NOT("IS","MA","CS")  SELECT XM.XB FROM STUD WHERE SD NOT IN (IS,MA,CS)  

热门试题

更多