健康资讯 Empty cells are a type of cells having no value inside them. This phenomenon can be found in most spreadsheet programs, as well as in databases and other software that involves the manipulation of data.
1、Empty cells have neither values or formulas, and thus neither allow you to enter in any data nor show any operations.
2、Empty cells may occur if the user deletes values or formulas from a worksheet, or they may mark the beginning of a range of non-contiguous cells. This means that a spreadsheet populated with empty cells could still appear blank even with the cells activated.
3、Empty cells will usually appear as a blank area on the sheet, as they do not present any content. This also makes them easy to differentiate from non-empty cells, which may contain a value or a formula, or may be part of a range of cells containing one or more formulas.
4、Empty cells can be useful in certain situations, such as when you want to temporarily ignore or suppress specific defa- ult values or formulas in a worksheet, or to separate groups of data in a table.
5、If a cell contains a formula that results in an empty cell, then such formula needs to be deliberated and changed to a valid one in order for the worksheet to be populated with the needed result.
6、Empty cells can be filled in, if necessary, it just depends on the specific use or application. In spreadsheets, readers can populate empty cells with data manually or automatically through the use of formulas, macros or scripts.
7、It is also possible to delete, clear, or hide empty cells, so they do not obstruct the worksheet or take up unnecessary space in the view.
8、Empty cells can also be helpful in data analysis tools and tools used for plotting charts, as they allow specific parts of the data to be hidden or suppressed. 9、When dealing with large amounts of data, locating cells with no value or formula can be tricky, as they may be lost in the crowd of other cells. An easy way to find empty cells is a comprehensive search tool to locate them quickly.
1．在计算机的数据库系统中，空单元（empty cells）是指无任何字符（数据）制作的某个字段空白的单元格。它们不应该被看作有实际的值，但是根据系统的不同，他们可以被认为是“NULL”或为空（NULL）。
2．为了更好地传达出“empty cells”被当做NULL的情况，必须先明确什么是NULL，NULL是一个空（空值）属性，它表明一个特定的字段尚没有被赋以值，它表达的是：“这个字段不存在值”的意思。
3．然而，当一个空的单元格（empty cells）被当做NULL时，意思是一个字段的值不存在或不明，同时它也可以被理解为代替NULL值持有空白值（empty value）。在这种情况下，表明该数据被设置为空，但实际上该数据还没有被赋予一个值。
4．由于空单元格（empty cells）和NULL可以互换使用，因此它们可以被视为同样的概念，不过空单元格还有一个额外的特点是它可以由用户设置，而NULL是一个死的标志属性。
5．因此，从上述描述可以看出，“empty cells”被当做NULL的情况，是指空单元格被认为未被赋任何有效值的情况，它在某种程度上可以代替空值（NULL），但也是一个活的标志属性，由用户设置。
