Django provides aĬount() method for precisely this reason. Note: If you only need to determine the number of records in the set (andĭon’t need the actual objects), it’s much more efficient to handle a countĪt the database level using SQL’s SELECT COUNT(*). This, as you might expect, returns the length of the result list. A QuerySet is evaluated when you call len() on it. Immediately see your results when using the API interactively. This is for convenience in the Python interactive interpreter, so you can A QuerySet is evaluated when you call repr() on it. Purposes of this section is that the results are read from the database. See the following section for details of what Translate well into SQL and it would not have a clear meaning either. More filters, or modifying ordering) is not allowed, since that does not Slicing a QuerySet that has beenĪlso note that even though slicing an unevaluated QuerySet returnsĪnother unevaluated QuerySet, modifying it further (e.g., adding Will execute the database query if you use the “step” parameter of slice QuerySet usually returns another unevaluated QuerySet, but Django As explained in Limiting QuerySets, a QuerySet canīe sliced, using Python’s array-slicing syntax. ![]() ![]() In short, this last option is similar to sqlite browser where you type your filter and you query the same column.Support for asynchronous iteration was added.
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