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Extracting Data in SQL

Posted on 2011-02-23
4
347 Views
Last Modified: 2012-05-11
My SQL is loading without any errors, but I cannot use this:

Select * from classroom; 
Select * from department; 
Select * from course; 
Select * from instructor; 
Select * from section; 
Select * from teaches; 
Select * from student; 
Select * from takes; 
Select * from advisor; 
Select * from prereq; 
Select * from timeslot; 

What is going on?
drop database if exists University;
create database University;
use University;

create table department(
dept_name varchar(20),
building  varchar(15),
budget    numeric(12, 2),
check (budget > 0),
index(dept_name),
primary key(dept_name)
);

create table instructor(

id varchar(20),
name varchar(20) not null,
dept_name varchar(20),
salary numeric(8, 2),
foreign key(dept_name) references department(dept_name)
    on delete set null,
primary key(id),
index(id)
);



create table course(

course_id varchar(8),
title varchar(50),
dept_name varchar(20),
credits numeric(2,0),
check (credits > 0), 
foreign key(dept_name) references department(dept_name)
    on delete set null,
primary key(course_id)

);

create table classroom(

building varchar(15),
room_number varchar(7),
capacity numeric(4, 0),
primary key(building,room_number),
index(building), #new index
index(room_number) #new index
);


create table section(

course_id varchar(8),
sec_id varchar(8),
semester varchar(6),
year numeric(4,0),
building varchar(15),
room_number varchar(7),
time_slot_id varchar(4),

foreign key(course_id) references course(course_id)
    on delete cascade,
foreign key(building) references classroom(building)
    on delete set null,
foreign key(room_number) references classroom(room_number)
    on delete set null,
primary key(course_id,sec_id,semester,year),
#index(building),
#index(room_number),
index(course_id), #new index # doees it have anything to do with the indices?
index(sec_id), #new index
index(semester), #new index
index(year) #new index
);

create table teaches(

id varchar(20),
course_id varchar(8),
sec_id varchar(8),
semester varchar(6),
year numeric(4,0),


foreign key(course_id) references section(course_id) #department(sec_id) -> section(sec_id)
    on delete cascade,
foreign key(sec_id) references section(sec_id) #department(sec_id) -> section(sec_id)
    on delete cascade,
foreign key(semester) references section(semester) #department(sec_id) -> section(sec_id)
    on delete cascade,
foreign key(year) references section(year)
    on delete cascade,
foreign key(id) references instructor(id)
    on delete cascade,
primary key(id,course_id,sec_id,semester,year)
);




create table student(

id varchar(5),
name varchar(20) not null,
dept_name varchar(20),
tot_cred numeric(3,0),

foreign key(dept_name) references department(dept_name)
    on delete set null,
#primary key(id),
index(id) #new index

);


create table advisor(

s_id varchar(5),
i_id varchar(5),

foreign key(i_id) references instructor(id)
    on delete set null,

foreign key(s_id) references student(id)
    on delete cascade,

primary key(s_id)
#index(s_id)
);




create table takes(

id varchar(5),
course_id varchar(8),
sec_id varchar(8),
semester varchar(6),
year numeric(4,0),
grade varchar(2),

    foreign key(course_id) references section(course_id)
        on delete cascade,

    foreign key(sec_id) references section(sec_id)
        on delete cascade,

    foreign key(semester) references section(semester)
        on delete cascade,

    foreign key(year) references section(year) #section(year) -> section(year)
        on delete cascade,

    foreign key(id) references student(id)
        on delete cascade,

    primary key(id,course_id,sec_id,semester,year)

);

create table prereq(

course_id varchar(8),
prereq_id varchar(8),


    foreign key(course_id) references course(course_id)
        on delete cascade,

    foreign key(prereq_id) references course(course_id),

    primary key(course_id,prereq_id)

);

create table timeslot(

time_slot_id varchar(5),
day2 varchar(1),
start_hr int,
start_min int,
end_hr int,
end_min int,

primary key(time_slot_id,day2,start_hr,start_min)	                                 	

        	
);

load data infile 'j:/department.txt' into table department fields terminated by ',';
load data infile 'j:/instructor.txt' into table instructor fields terminated by ',';
load data infile 'j:/course.txt' into table course fields terminated by ',';
load data infile 'j:/classroom.txt' into table classroom fields terminated by ',';
load data infile 'j:/section.txt' into table section fields terminated by ',';
load data infile 'j:/teaches.txt' into table teaches fields terminated by ',';
load data infile 'j:/student.txt' into table student fields terminated by ',';
load data infile 'j:/advisor.txt' into table advisor fields terminated by ',';
load data infile 'j:/takes.txt' into table takes fields terminated by ',';
load data infile 'j:/prereq.txt' into table prereq fields terminated by ',';
load data infile 'j:/timeslot.txt' into table timeslot fields terminated by ',';

Open in new window

University.zip
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Comment
Question by:JCW2
  • 2
4 Comments
 
LVL 18

Expert Comment

by:Jerry Miller
ID: 34967338
At the end of your variable declarations you have an extra comma. For example,
course_id varchar(8),
sec_id varchar(8),
semester varchar(6),
year numeric(4,0),
building varchar(15),
room_number varchar(7),
time_slot_id varchar(4),

should be:
course_id varchar(8),
sec_id varchar(8),
semester varchar(6),
year numeric(4,0),
building varchar(15),
room_number varchar(7),
time_slot_id varchar(4)

0
 
LVL 17

Expert Comment

by:shinuq
ID: 34967342
you need to grant the user privileges to the database, hope that is done?
0
 

Accepted Solution

by:
JCW2 earned 0 total points
ID: 34967358
Apparently the select statements couldn't be all in one row.

That is, I needed Select * from
                         classroom;    or
                         Select *
                         from classroom;
instead of Select * from classroom;
0
 

Author Closing Comment

by:JCW2
ID: 34995593
This answer got the data printed out for me.
0

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