select the two characteristics that all viruses share.
I have a table containing a unique ID field. Another field (REF) contains a reference to another dataset's ID field. Now I have to select all datasets where REF points to a dataset that doesn't exi... If I just need 2/3 columns and I query SELECT * instead of providing those columns in select query, is there any performance degradation regarding more/less I/O or memory? The network overhead mig...
Viruses-definition, classification, replication, cultivation of viruses ...
