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I'm having problems with the problem 4a. I would appreciate some guidance. This is what I have until now.

Computer Science
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this is the url:
and this is what I have: SELECT m.yr FROM movie m INNER JOIN actor a INNER JOIN casting c ON = c.movieid AND = c.actorid WHERE = 'John Travolta' ORDER BY yr;
I'm getting a list with the years Travolta made a movie. I know I need a GROUP BY and a COUNT. But the don't work when I put them into the SELECT.

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This should yield your results: select m.yr, count( as NumMovies from movie m inner join casting c on c.movieid = inner join actor a on = c.actorid where = 'John Travolta' group by m.yr order by NumMovies desc

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