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..
.......