self.__helpTextRect.adjusted(3,3,-3,-3), Qt.TextWordWrap, self.__helpText)ifself.__selection.isNull():return# The grabbed region is everything which is covered by the drawn# rectangles (border included). This means that there is no 0px 开发者ID:Darriall,项目名称:eric,代码行数:70,...
Let’s say we want the average age of the people in the dataset. We can use ISNULL() to supply a value to the nulls as a means for estimating the average age: select avg(ISNULL(age, 30)) as averageAge from people 4. When not to use the ISNULL() function While ISNULL() is ...
4. Data Type Conversion in ISNULL SQL Server's handling of data type conversion when using the ISNULL function, especially with mixed data types in expressions, is based on the rules of data type precedence. This means that when you use ISNULL with two different data types, SQL Server con...