Assume that relation PROJ of our example database above is horizontally fragmented as follows: PROJO PNOS P2 (PROJ) PROJ₂ = PNO P2 (PROJ) And, the relation ASG is horizontally fragmented as ASGO PNOS P2 (ASG) ASG₂ = σ "P2"
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3. Assume that relation PROJ of our example
PROJO PNOS P2 (PROJ)
PROJ₂ = PNO P2 (PROJ)
And, the relation ASG is horizontally fragmented as
ASGO PNOS P2 (ASG)
ASG₂ = σ "P2" <PNOS P3 (ASG)
ASG=σPNO>P3 (ASG)
1) Transform the following query into a reduced query on fragments: and 2) Is it better than the generic query? And Why? or Why not?
SELECT
RESP, BUDGET
FROM
ASG, PROJ
WHERE
ASG.PNO PROJ.PNO AND PNAME="CAD/CAM" =
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