4 ms·It's not an index on every column. It's a single index across all columns.by ccleve 5y agoIt's not an index on every column. It's a single index across all columns.noisy_boy 5y agoWhich will be updated every time there is a new combination.Animats 5y agoWhich is OK. It's not like the whole index has to be rebuilt. It's cheaper than O(log N).