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MySQL Optimization: EXPLAIN Extra column contains Using Where Nullable columns do have overhead, because of the extra need to check for the null condition if a column doesn't have to be null, or your requirements don't allow for null, then definitely make the column not null As for the indexes, depends on the index construction If the index is defined with (a,b,c) and you're using b,c in your where clause, this index cannot be used as a is not in play
Can pip. conf specify two index-url at the same time? I have tried using pip with index-url in pip conf However, i can not make sure that we can get all the necessary python library So, i want to know if pip support specify more than one index-url
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NHibernate Lazy=Extra - Stack Overflow The lazy = extra allow to count the element of a collection without needing of fetching it, since the lazy entity is decorated with a proxy, when the client code ask for the Count on the collection, a proper " select count " query is issued to the database
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