| http://www.w3.org/ns/prov#value | - And even in the case that there is a need for a second lookup, with the amount of RAM that we have at our disposal these days, the second lookup is going to be very efficient (innodb has exceptional performance for primary key lookups when data fits in memory) and even more so the primary key holds the data itself quite unlike MyISAM which hold a pointer to the data.
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