Duplicate entries may be valid -- but when they aren't, they can derail your summaries and totals. Use Excel's Validation feature to reject duplicate entries.

Entering data into a worksheet can be time-consuming, and mistakes often find their way in -- but with the right tools, both speed and accuracy can be improved. Here's a look at several Excel ...

Automated Data Entry in Excel. One way businesses can save time and money is using Excel spreadsheets as data tables in which to store customer information, inventory details or other important data.

Microsoft Excel makes it possible for users to easily get around incorrect data entries. In most cases, the user takes advantage of the data validation feature.

Learn how to create a drop-down list using Data Validation in Excel. Data Validation limits the type of data that can be entered into a cell.

Figure 2: Select the tables you want to import into Excel from the website in the dialog box. When you have selected the tables that you want to import into Excel, click Import. When the Import Data ...

Use Data Validation in Excel You can use Excel's data validation to make sure that people only enter a certain type of data, such as a date, in a particular cell.

Microsoft expands Excel's real-time "data types" by adding support for your data, as well as hundreds of sources from Wolfram Alpha.