For the Subtitle1 field of the Gallery, we will use a combination of the Filter and Sum functions. The filter will limit our summation to just the detail records for this order, by matching the ...

SUM() OVER(ORDER BY.. ROWS BETWEEN.. AND..) UNBOUNDED PRECEDING – the first possible row. 2 PRECEDING – the n-th row before the current row (instead of n, write the number of your choice). CURRENT ROW ...

Understanding of the functions of SQL is essential in order to conduct effective analysis of data and preparation of the reports. The simple grouping functions which are used in the summarization ...

This PR adds new `Expr` class that will replace previous `pexpr`. The main features of this class are: - Each `Expr` object is used by-value (encapsulates the pimpl idiom); - Each `Expr` contains the ...