


Early in 1994 Microsoft Excel 5 brought a new functionality called a "PivotTable" to market. In 1993 the Microsoft Windows version of Improv appeared. Borland purchased the DataPivot technology in 1992 and implemented it in their own spreadsheet application, Quattro Pro. A few months after the release of Improv, Brio Technology published a standalone Macintosh implementation, called DataPivot (with technology eventually patented in 1999). Lotus Development released Improv in 1991 on the NeXT platform.

This core functionality would provide the model for pivot tables. With Improv, users could define and store sets of categories, then change views by dragging category names with the mouse. A tool that could help the user recognize these patterns would help to build advanced data models quickly. While working on a concept for a new program that would eventually become Lotus Improv, Salas noted that spreadsheets have patterns of data. In their book Pivot Table Data Crunching, Bill Jelen and Mike Alexander refer to Pito Salas as the "father of pivot tables". 4.4 Programming languages and libraries.It can sense the cells that have changed. As an option to protecting the worksheet cells, you can think about a Worksheet_Change macro. If you forget the password, your work will be irretrievable. If you give a password, you will have to remember it along with the case that you have used. Give one if you want to and then click on OK. If you want to protect the sheet furthermore, then you can also add a password. Then go to the Tools menu and move over to the Protection tab.Now click to clear the checkbox Locked and then click on OK.Then click on Cells followed by the Protection tab. If these cells are not adjacent to one another, hold down the CTRL key and click the cells that you do not want to lock. When you want to lock a major part of the Excel spreadsheet, select the cells that you do not want to lock.You will not be able to change any other attributes of the cell such as the cell formatting. If you lock a cell and protect the worksheet, you will not be able to type anything into the cell or modify the existing data. This will ensure that the formula and the data are not manipulated. If you have a complex formula that you have worked on and it has been tried and tested properly, it may be a good idea to block any further changes. It is important to protect the contents of a cell in order to prevent any accidental deletion or to prevent anyone from wrecking the integrity of calculations. Follow the steps mentioned in the article for the same. To protect important data in Excel from being deleted or manipulation, it is necessary to lock the cells.
