Database Management Systems R Ramakrishnan2 Database Management Systems R Ramakrishnan3 Boats bname color sname rating Reserves sid bid day we will use these Database Management Systems R Ram ID: 161783
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Database Management Systems, R. Ramakrishnan1 Database Management Systems, R. Ramakrishnan2 Database Management Systems, R. Ramakrishnan3 Boats bname color sname rating Reserves sid bid day ; we will use these Database Management Systems, R. Ramakrishnan4 Sailors sname rating P._NP._A Sailors sname rating age P.AO(1)�. 8AO(2). QBE puts unique new variables in blankcolumns. Above query in DRC (no ordering): INTAINTASailorsT,,,|,,,ÎÙ� Database Management Systems, R. Ramakrishnan5 sname rating P.0 P.� 20 older than 20: sname rating _IdP. _IdP.� 20 sname rating _IdP.� 4 30 Note: MiniQBEuses a slightly different syntax! Database Management Systems, R. Ramakrishnan6Duplicates sname rating UNQ.P.P: Duplicates not eliminated by sname rating ALL._IdP.0 _IdP.� 20P: Duplicates eliminated by Database Management Systems, R. Ramakrishnan7 sname _IdP._S� 25 Reserves sid _Id‘8/24/96’ double Database Management Systems, R. Ramakrishnan8 Sailors sname _Id_S� 25 Reserves sid _Id_B‘8/24/96’ Boats bid bname color _B‘Interlake’P. Database Management Systems, R. Ramakrishnan9 sname _IdP.P. Reserves sid bid day 22_B _Id_B Database Management Systems, R. Ramakrishnan10 Sailors sname _IdP._R_AP._DP.(_R/_A) Reserves sid _Id_D MiniQBE allowsP. in multiple tables Database Management Systems, R. Ramakrishnan11column: sname _IdP._S Reserves sid _Id_B table! Database Management Systems, R. Ramakrishnan12Aggregates sname _IdG.G.P.AO_AP.AVG._A Database Management Systems, R. Ramakrishnan13 sname G.P._A CONDITIONS AVG._�A 30 sname P._A CONDITIONS 20 _A AND _A 0 Database Management Systems, R. Ramakrishnan14 Sailors sname CONDITIONS COUNT._B1= COUNT._B2 bid _Id_B1 Boats bid bname color Database Management Systems, R. Ramakrishnan15 Sailors sname I._Id_N_A CONDITIONS _A� 18 OR _N LIKE ‘C%’ Students sid name _Id_N_A Sailors sname I.74Janice714 Database Management Systems, R. Ramakrishnan16 Sailors sid sname rating age _Id 4 bid D._Id sname 74U._A+1 Database Management Systems, R. Ramakrishnan17 Sailors sid sname rating age john_A joeU._A+1 Joe’s age? John’s age should we use? Database Management Systems, R. Ramakrishnan18 sname _IdP._S Reserves sid _Id_B Boats bname color negative rows be considered? (Meaning changes!) Database Management Systems, R. Ramakrishnan19 sname _IdP._S Reserves sid _Id_B Boats bname color BadSids sid I._Id sname _IdP._S BadSids sid _Id Database Management Systems, R. Ramakrishnan20 A Peek at MS Access Database Management Systems, R. Ramakrishnan21Summary