Question

what is advanced filtering? How can be applied on a table in a datasheet?

Answer 1

Use an Advanced Filter in Excel to create a list of unique items, or to extract specific items to a different worksheet. You can also use complex criteria with an Advanced Filter, so it is useful when a simple AutoFilter can't do what you need.
1. Set up the database

The first row (A1:D1) has headings. Each column must have a unique heading -- duplicate headings will cause problems when running an Advanced Filter.
Subsequent rows contain data.
There are no blank rows within the database.
There is a blank row at the end of the database, and a blank column at the right. go to top
Database

2. Set up the Criteria Range (optional)

In the criteria range for an Excel advanced filter, you can set the rules for the data that should remain visible after the filter is applied. You can use one criterion, or several.

In this example, cells F1:F2 are the criteria range.
The heading in F1 exactly matches a heading (D1) in the database.
Cell F2 contains the criterion. The > (greater than) operator is used, with the number 500 (no $ sign is included).
Criteria Range

After the Excel advanced filter is applied, orders with a total greater than $500 will remain visible.

Other operators include:
< less than
<= less than or equal to
>= greater than or equal to
<> not equal to go to top

3. Set up the Extract Range (optional)

If you plan to copy the data to another location, you can specify the columns that you want to extract. If you want to extract ALL columns, you can leave the extract range empty for the Excel advanced filter.

Select the cell at the top left of the range for the extracted data.
Type the headings for the columns that you want to extract. These must be an exact match for the column headings, in spelling and punctuation. The column order can be different, and any or all of columns can be included. go to top
Criteria Range

4. Apply the Excel Advanced Filter

Select a cell in the database.
On the Excel Ribbon's Data tab, click Advanced, to open the Advanced Filter dialog box
Criteria Range

You can choose to filter the list in place, or copy the results to another location.
Excel should automatically detect the list range. If not, you can select the cells on the worksheet.
Select the criteria range on the worksheet
If you are copying to a new location, select a starting cell for the copy
Note: If you copy to another location, all cells below the extract range will be cleared when the Advanced Filter is applied.
Click OK
Apply Filter.
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Answer 2

Answer:

it is an advanced version of the normal filter.the customised filter criterion, it future narrows down the display of the records.