有冇好友學過lossless join decomposition of R into Boyce-Codd normal form [復制鏈接]

有一個relation schema : R={B,O,I,S,Q,D}
同埋有個functional dependencies:
F = {S-->D, I-->B, IS-->Q, B-->O}

Q1: Find a candidate key for the relation schema.其實要點揾架..

Q2: Find a lossless join decomposition of R into Boyce-Codd normal form. Show all ur steps in detail.

THX!!

引用第0樓sy0250358於2009-11-18 17:06發表的“有冇好友學過lossless join decomposition of R into Boyce-Codd normal form”:
有一個relation schema : R={B,O,I,S,Q,D}
同埋有個functional dependencies:
F = {S-->D, I-->B, IS-->Q, B-->O}
Q1: Find a candidate key for the relation schema.其實要點揾架..
.......

睇完其實都未知係邊個課目。 係唔係Year 3-4的computer science野?

Sorry, 真係唔記得lu~.......

太深了

咁專, 好難有人幫儂