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Found 1 result

  1. relational algebra

    hi, sorry, i have a question to do...but i know how to write in sql query ....however the answer need to write on relational algebra in query is like : SELECT * FROM operation where r='broken' group by pc having count(pc) >1 ; π id,pc,result ( σ r = 'broken' (operation)) like group by and having clasue...i no idea ... i searched on internet still @@ .... isnt the answer like that, i using split/step by step method to do rel 1 = σ r = 'broken' (operation) rel 2 = σ count(pc)>1 γ pc,count(pc) (rel 1)) rel 3 = π id,pc,result (rel 2 ) thanks
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