The object we deal with directly in Excel is called a worksheet.
A worksheet is a table displayed in the workbook window. A worksheet can be composed of 1048576 rows and 256 columns. The rows are numbered from 1 to 1048576, and the columns are numbered with the letters A and B in sequence. ...IV means that the row number is displayed on the left side of the workbook window, and the column number is displayed on the top of the workbook window.
Excel has three worksheets in a workbook by default. Users can add worksheets as needed, but the number of worksheets in each workbook is limited by available memory. The current mainstream configuration can easily create more than 255 worksheets.
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