| One URGENT problem with SQL [message #409] |
Mon, 11 February 2002 06:14  |
Chen Wen
Messages: 26
Registered: February 2002
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Junior Member |
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There are three tables: course, sect and enrolled.
How to list all departments, numbers, minimum enrollment, and how far they're under that will be cancelled due to under-enrollment.
course:
DEPT NUM NAME CREDITS
-------------------------------
CSCI 541 Database 3
CPT 541 Access 4
CSCI 702 PhD Thesis 3
sect:
DEPT NUM SECT MIN_NUM MAX_NUM
----------------------------------------
CSCI 541 B332 20 30
CPT 541 S873 30 150
CSCI 701 B411 1 1
CSCI 702 B445 1 3
CSCI 701 B412 1 2
CSCI 701 B4131 1 1
enrolled:
SIDN SECT CREDITS
---------- ----- -------
111111111 B411 2
222222222 B332 3
111111111 B412 3
222222222 B412 4
333333333 B412 3
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| Re: One URGENT problem with SQL [message #413 is a reply to message #409] |
Mon, 11 February 2002 07:02  |
pratap kumar tripathy
Messages: 660
Registered: January 2002
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Senior Member |
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hi,
here is the basic query and add the restriction acoordingly.otherwise explain the meaning of each field.
select c.dept,
c.num,
s.min_num
from course c,
sect s,
enrolled e
where c.dept=s.dept
and c.num=s.num
and s.sect=e.sect
cheers
pratap
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| Re: One URGENT problem with SQL [message #415 is a reply to message #409] |
Mon, 11 February 2002 07:11 |
Chen Wen
Messages: 26
Registered: February 2002
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Junior Member |
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Hi,
Thanks.
But how to list the number to indicate how far they're under that will be cancelled due to under-enrollment? That is the student number enrolled in each course substract min_num.
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