Azure Storage Table Query, Which is faster?

In method #2, the row key is empty, but you're query specifies a non-empty row key (of "B"). Did you mean and (RowKey eq "")? If so, that method is faster, in that it will always return a result.

Method #1 may return an empty result set with a continuation token, at which point you have to make a second query to actually get at the data.

If I understand your question… If A is a unique value across the whole table, B’s uniqueness is irrelevant. So you are better off, scalability wise, to split A in two, and use the first part as the Partition Key and the second part as the Row Key.

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