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44 lines
1.3 KiB
TeX
44 lines
1.3 KiB
TeX
\documentclass[12pt]{article}
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\title{EDABA Homework 3}
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\author{Krzysztof Rudnicki, 307585}
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\begin{document}
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\maketitle
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\section{Task 1}
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Find lectures with the highest ECTS
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\begin{verbatim}
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LECT_highest = SELECT L#, LNAME FROM LECT AS X WHERE NOT EXIST
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( SELECT * FROM LECT AS Y WHERE Y.L# != X.L# AND Y.ECTS > X.ECTS )
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\end{verbatim}
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\section{Task 2}
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Find students attending some lectures with the highest ECTS
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\begin{verbatim}
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LECT_highest = SELECT L#, LNAME FROM LECT AS X WHERE NOT EXIST
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( SELECT * FROM LECT AS Y WHERE Y.L# != X.L# AND Y.ECTS > X.ECTS )
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SELECT UNIQUE SN, S#
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FROM ST
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WHERE ST.S# = S#_HIGHEST
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S#_HIGHEST =
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SELECT S#
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FROM LS
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WHERE LS.L# = LECT_highest.L#
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\end{verbatim}
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\newpage
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\section{Task 3}
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Find lectures which have more than 3 ECTS and are attended by \textbf{some} students from the track CS
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\begin{verbatim}
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L_THREE_CS = SELECT UNIQUE L# FROM
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(SELECT L# FROM LECT WHERE ECTS > 3
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INTERSECT
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SELECT L# FROM ST, LS WHERE (ST.S# = LS.S# AND ST.TRACK = CS))
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\end{verbatim}
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\section{Task 4}
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Find the students attending ONLY lectures with ECTS >3, i.e. no other lectures - using EXIST (NOT EXIST) statement
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\begin{verbatim}
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SELECT S#, SN FROM STUDENT AS X WHERE
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NOT EXIST
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( SELECT S# FROM LECTURES AS Y WHERE Y.ECTS < 4)
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\end{verbatim}
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\end{document} |