![]() In that case, we can filter by the average over the ratings a restaurant has received and only include restaurants that have at least some number of reviews from distinct users. Suppose we want to query only the best restaurants. ![]() The semantics of the above functions is documented in the PostgreSQL documentation.įor the complete specification of the schema of aggregation predicates, see the API reference: AggregationExp.Īssume we have a dataset of restaurants with user-submitted reviews that contain a rating. var_samp(number): Computes the sample variance of the input values (square of the sample standard deviation).stddev_samp(number): Computes the sample standard deviation of the input values.covar_samp(Y number, X number): Computes the sample covariance.corr(Y number, X number): Computes the correlation coefficient.sum(number): Computes the sum of the non-null input values.min(number): Computes the minimum of the non-null input values.max(number): Computes the maximum of the non-null input values.) : Computes the number of input rows in which the input value is not null. bool_or(bool): Returns true if any non-null input value is true, otherwise false.bool_and(bool): Returns true if all non-null input values are true, otherwise false.avg(number): Computes the average (arithmetic mean) of all the non-null input values.You can filter based on aggregations over the elements of an array relationship field. No Schema Available Filter based on aggregations of nested array fields
0 Comments
Leave a Reply. |