Both price increase judgment and getting cumulative count involve the window function and the subquery, producing hard to write and understand code containing two window functions and 4-layer nested ...

SQL is a tool that is widely used in the manipulation of data and featuring in the relational database. They are applied in querying, manipulating as well as reporting data and it is commonly used by ...

Learn how to easily fix the your query does not include the specified expression as part of an aggregate function SQL error.

SQL window functions provide extremely powerful and useful features that let you work with observations more easily. Different types explained here.

An aggregate function includes values grouped together to form a single value that provides a summary of the data list.

In sql server easy can pass expression to aggregate functions such as sum, avg, min, max and etc. for example: select sum(col1 + col2) from table1 but in entity framework not support and just calcu ...