You can use aggregate functions in SQL queries to perform operations on ... comparing and contrasting data across different groups, and testing hypotheses. For example, they can help you find ...

This function converts an expression of one data type to another. Is also an ANSI SQL function, so it can be used in different flavors of SQL ... Columns that are not grouped must be contained in ...

When using multiple quantile* functions with different levels in a query, the internal states are not combined (that is, the query works less efficiently than it could). In this case, use the ...