Hi Anton, I had already several requests in this direction. The new class could behave like TChain but on the columns instead of the rows, allowing for corrrelations betweens columns of different Trees. I do not think it is too complex to implement, but as usual it takes time. Rene Brun This will permit FOKIN@tsl.uu.se wrote: > > Hi rooters, > > assuming TTree is a table in the RDBMS terminology, > are we planning to have a TTreeFarm, which can be considered > as a full-scale relational data base? It would also be nice > to mine such a farm using normal SQL (relational) queries > including table selection, etc. > > Rene, what do you think? > > You may say that we can avoid it if we put all our data > in one tree, but it is like putting all eggs in one > basket. Also, it is not practically possible in some > situations. > > Regards, > Anton
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