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Query Tree (Initial Tree)
BASIS DATA 20 Query Tree (Initial Tree) 1
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Narasi Tampilkan Nomor proyek, Nomor departemen,Nama akhir pegawai,
alamat dan tanggal lahir dari manajer Depertemen yang membawahi Project yang berlokasi di “Stafford”
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SQL SELECT P.PNUMBER, D.DNUMBER, E.LNAME, E.ADDRESS, E.BDATE
FROM EMPLOYEE E, DEPARTEMEN D, PROJECT P WHERE P.PLOCATION = “Stafford” AND D.DNUMBER = P.DNUM AND E.SSN = D.MGRSSN
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Aljabar Relasi π P.PNUMBER, D.DNUMBER, E.LNAME, E.ADDRESS, E.BDATE (δP.PLOCATION = “Stafford” ^ D.DNUMBER = P.DNUM ^ E.SSN=D.MGRSSN)
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δP.PLOCATION= “Stafford” ^
Initial Tree π P.PNUMBER, D.DNUMBER, E.LNAME, E.ADDRESS, E.BDATE δP.PLOCATION= “Stafford” ^ D.DNUMBER = P.DNUM ^ E.SSN=D.MGRSSN X X E P D
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