1
我想创建一个视图,记录所有计算机科学专业的选定属性。为什么我的查看查询拆分为两个?
这是我的查询创建视图:
DROP VIEW CS_grade_report;
CREATE VIEW CS_grade_report AS
SELECT Student.student_id AS "ID",
student_name AS "Name",
course_number AS "Course #",
credit AS "Credit",
grade AS Grade
FROM Student, Class, Enrolls
WHERE major = 'CSCI'
AND Student.student_id = Enrolls.student_id
AND Class.schedule_num = Enrolls.schedule_num;
SELECT *
FROM CS_grade_report;
而这会产生什么:
ID Name Course # Credit GR
------ ------------------------- -------- ---------- --
600000 John Smith CSCI3200 4 B+
600000 John Smith CSCI3700 3 C
600000 John Smith SPAN1004 3 A-
600000 John Smith CSCI4300 3 A+
600001 Andrew Tram MUSC2406 2 A+
600001 Andrew Tram SPAN1004 3 A
600001 Andrew Tram CSCI3700 3 B-
600002 Jane Doe CSCI4200 3 D+
600003 Michael Jordan CSCI4300 3 A+
600004 Tiger Woods MUSC1000 1 A
600007 Dominique Davis CSCI4300 3 F
ID Name Course # Credit GR
------ ------------------------- -------- ---------- --
600009 Will Smith CSCI3200 4 A
600010 Papa Johns CSCI3200 4 B
600011 John Doe CSCI3200 4 C
600012 Jackie Chan CSCI3200 4 D
600013 Some Guy CSCI3200 4 E
16 rows selected.
你在哪里运行SELECT? –
在sqlplus中运行?尝试'SET PAGESIZE 50'为50行到一页,查看sqlplus ref手册中的各种方法来更改列格式,标题等。http://docs.oracle.com/cd/B10501_01/server.920/ a90842/ch13.htm#1011230 – Glenn