Räkneövning 2 i Databaser modellsvar vecka 6, 2012
Räkneövning 2 i Databaser modellsvar vecka 6, 2012
Räkneövning 2 i Databaser modellsvar vecka 6, 2012
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eller<br />
f) Hur många Comp. Sci. studenter finns det i student ?<br />
Gcount()(dept_name = 'Comp. Sci.' (student))<br />
4<br />
antal (dept_name = 'Comp. Sci.' (dept_nameGcount() as antal (student)))<br />
dept_name antal<br />
Comp. Sci. 4 antal<br />
History 1 4<br />
Finance 1<br />
Physics 3<br />
Music 1<br />
Elec. Eng. 2<br />
Biology 1<br />
g) Hur många studiepoäng (credits) får den som tar alla de kurser som ges<br />
av institutionen Comp. Sci.?<br />
Gsum(credits)(dept_name = 'Comp. Sci.' (course))<br />
course_id title dept_name credits<br />
CS101 Intro. to Computer Science Comp. Sci. 4<br />
CS190 Game Design Comp. Sci. 4<br />
CS315 Robotics Comp. Sci. 3<br />
CS319 Image Processing Comp. Sci. 3<br />
CS347 Database System Concepts Comp. Sci. 3 17
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