Easy Advanced Excel Interview Questions

A relative reference like A1 shifts when a formula is copied, an absolute reference like $A$1 never shifts, and a mixed reference like $A1 or A$1 locks only the column or only the row. In a multiplication grid, =$A2*B$1 copied across and down keeps the header column and header row fixed. Press F4 while editing a reference to cycle through the four forms.

A workbook is the whole file (.xlsx, .xlsm or .xlsb). A worksheet is one tab inside it with 1,048,576 rows and 16,384 columns. A range is any group of cells such as A2:D100 that a formula, chart or format refers to. Good practice is to keep raw data, calculations and output on separate worksheets of the same workbook so each layer is easy to audit.

A Table expands automatically when new rows or columns are added, so formulas, charts and pivot tables based on it pick up new data without editing ranges. It also gives banded rows, header filters, a Total Row, calculated columns that fill down by themselves, and structured references like Sales[Amount]. For any data that grows every month, a Table is the safest starting point.

Conditional formatting changes a cell's colour, font, icon or data bar based on a rule, so patterns stand out without reading every number. Common uses are highlighting invoices overdue by more than 30 days in red and adding data bars to a sales column so top performers are visible at a glance. Keep rules few and consistent, because many overlapping rules slow down large files.

Data Validation restricts what users can type in a cell, which prevents bad input in forms and trackers. For a dropdown, select the cells, go to Data > Data Validation, choose Allow: List and set Source to a range such as =$K$2:$K$10 or a typed list like Open,Closed,On Hold. Pointing the source at a Table column keeps the list updated automatically when new options are added.

Situation: I inherited a sales tracker with merged cells, hard-coded totals and three different date formats. Task: my manager needed reliable weekly numbers. Action: I kept a backup copy, converted the data into an Excel Table, fixed dates with Text to Columns, replaced typed totals with SUMIFS and added data validation dropdowns. Result: weekly reporting time fell from two hours to twenty minutes and the totals stopped being questioned.

Paste Special (Ctrl+Alt+V) lets you paste only part of what was copied. Values removes formulas, Formats copies only styling, Transpose flips rows into columns, and Skip Blanks avoids overwriting with empty cells. The Operation options can multiply or divide a whole range by a copied number, for example converting rupees to lakhs by copying 100000 and choosing Divide.

The numbers are most likely stored as text, often with leading apostrophes, trailing spaces or non-breaking spaces (CHAR(160)). Check with =ISTEXT(A2) or LEN. Quick fixes are Data > Text to Columns > Finish, the green error triangle > Convert to Number, or Paste Special > Multiply by 1. For stubborn cases use =VALUE(TRIM(SUBSTITUTE(A2,CHAR(160),""))) or set the column type to Decimal in Power Query.

The workbook is probably in Manual calculation mode, often inherited from another file opened first in the same session. Press F9 to recalculate now, then set Formulas > Calculation Options > Automatic. If only some cells stay stale, check whether they are formatted as Text or whether Show Formulas is on. For very heavy files, manual mode can be kept deliberately, but tell users to press F9 before reading results.

A named range gives a meaningful name, such as GST_Rate or Target_FY26, to a cell, range or constant. Formulas like =Amount*GST_Rate are easier to read and audit than =B2*$Z$1. Names are managed in Formulas > Name Manager and can be scoped to the workbook or a single sheet. They also work as navigation targets in the Name Box and as Data Validation sources.

Ctrl+Arrow jumps to the edge of data and Ctrl+Shift+Arrow selects to it. Ctrl+T creates a Table, Ctrl+Shift+L toggles filters, Ctrl+1 opens Format Cells, Alt+= inserts AutoSum, F4 toggles absolute references or repeats the last action, F2 edits a cell, Ctrl+; inserts today's date, Ctrl+Alt+V opens Paste Special and Ctrl+E runs Flash Fill. Mentioning a few you genuinely use is better than reciting a long list.

Text to Columns splits a column by a fixed delimiter or fixed width in one go, which suits clean data like comma-separated codes. Flash Fill (Ctrl+E) learns a pattern from one or two examples you type, such as extracting first names or formatting phone numbers. Both produce static values, so if the source changes you must redo them, unlike formulas or Power Query steps.

Situation: in my internship, the team spent two hours every morning copying sales figures from three exports into one summary. Task: I was asked to make it faster. Action: I converted the exports to Tables, used XLOOKUP and SUMIFS to build a summary sheet, and added data validation for the date. Result: the report took ten minutes, errors from manual copying stopped, and the format was reused by another team.

Work on a copy. Unmerge all cells, then fill the blanks with the value above using Go To Special > Blanks and =cell above, followed by paste as values. Filter out blank rows and subtotal lines and delete them, keep one header row and convert the range to a Table. If the same report arrives every month, repeat these steps once in Power Query so the cleanup becomes a single refresh.

IFERROR replaces any error, such as #N/A, #DIV/0!, #VALUE! or #REF!, with a value you choose. IFNA replaces only #N/A, which is the normal result when a lookup finds no match. IFNA is safer around lookups because a genuine problem like a deleted column (#REF!) still shows up instead of being hidden as a blank or zero. Use IFERROR only where every error truly means the same thing.

TRIM removes leading, trailing and repeated spaces between words. CLEAN removes non-printable characters such as line breaks from system exports. PROPER, UPPER and LOWER change case, for example PROPER turns RAHUL SHARMA into Rahul Sharma. SUBSTITUTE replaces specific text, like =SUBSTITUTE(A2,"-","") to strip hyphens from a phone number. They are often nested together when cleaning customer master data.

Left alignment usually means the dates are stored as text. Select the column, use Data > Text to Columns, choose Date with the correct order such as DMY and finish; Excel converts them to real dates. For mixed or messy text, DATEVALUE or DATE with LEFT, MID and RIGHT works. If the file comes regularly, set the column type in Power Query using Using Locale so day and month are never swapped.

#N/A means a lookup found no match. #VALUE! means a wrong data type, such as adding text. #REF! means a referenced cell or column was deleted. #DIV/0! is division by zero or a blank. #NAME? means a misspelt function or undefined name. #SPILL! means a dynamic array formula cannot spill because cells in its output area are not empty. Knowing the cause helps you fix the source instead of hiding errors.

VLOOKUP can only look to the right of the key column, so it cannot return a value from a column on the left. The column index is a hard-coded number that breaks when columns are inserted. It returns only the first match, defaults to approximate match if the last argument is forgotten, and can be slow on big ranges. XLOOKUP or INDEX/MATCH solve all of these problems.

A pivot table summarises large tabular data by dragging fields into rows, columns, values and filters, without writing formulas. Use it when you need totals, counts or averages broken down by categories such as region, product and month, and when the breakdown changes often. It works best on clean data with one header row, no blank rows and one record per row, ideally stored in an Excel Table.

Rows lists categories down the left side, such as Region. Columns spreads categories across the top, such as Month. Values holds the numbers being summarised, such as Sum of Sales or Count of Orders. Filters applies a filter to the whole pivot, such as Financial Year. Moving a field from Rows to Columns changes the layout instantly, which is why pivots are quick for exploring data.

Click inside the data, press Ctrl+T to make it a Table, then Insert > PivotTable > New Worksheet. Drag Region to Rows, Order Date to Columns and Amount to Values. Right-click a date and choose Group > Months (and Years if data covers more than one year). Set Value Field Settings > Number Format to #,##0 and add a slicer for Product if needed. Refresh after new data arrives.

Summarize Values By chooses the calculation, such as Sum, Count, Average, Max or Min. Show Values As changes how that result is presented, for example % of Grand Total, % of Column Total, % of Parent Row Total, Running Total In, Difference From or Rank Largest to Smallest. Adding the same field twice, once as Sum and once as % of Grand Total, shows the amount and the share side by side.

Slicers are clickable filter buttons for a field, and timelines are slider filters for dates by day, month, quarter or year. They make filtering obvious for dashboard users. To control several pivots, right-click the slicer and choose Report Connections, then tick each pivot. This works only for pivots built on the same source or data model, because they share the same pivot cache.

The pivot's source is probably a fixed range like A1:H500 and the new rows are below it, or the pivot has not been refreshed. Fix it with PivotTable Analyze > Change Data Source, then Refresh. To prevent it, convert the source to an Excel Table so the range expands automatically, use Data > Refresh All, and enable Refresh data when opening the file in PivotTable Options.

Excel defaults to Count when a value column contains blanks or text, such as NA or a number stored as text. Change it through Value Field Settings > Sum, but also fix the source: replace text placeholders with zero or blank, convert text numbers to real numbers, and refresh. Otherwise the text entries are silently left out of the sum and totals will be understated.

Put Customer in Rows and Revenue in Values. Click the Customer filter arrow > Value Filters > Top 10, choose Top, 10, Items, by Sum of Revenue. Then sort the Revenue column largest to smallest. The grand total by default still reflects only the visible rows; if you need overall totals, add a separate pivot or enable Include filtered items in totals when using the Data Model.

Situation: three teammates built monthly summaries by filtering and copying data by hand. Task: my lead asked me to help them speed up. Action: I ran two short sessions using our own sales data, showing how to create a pivot, group dates, add slicers and refresh after new rows, and shared a one-page guide. Result: within a month each of them produced their summary in minutes, and fewer copy-paste errors reached the manager.

Double-click any value cell and Excel creates a new sheet listing every source row that makes up that number. This drill-down is very useful for checking totals or answering a manager's why question. If the file is shared and you do not want people extracting raw data, untick Enable show details in PivotTable Options > Data, though this is not a strong security control.

Situation: our store team felt discounts were not driving sales. Task: check it with data. Action: I built a pivot from six months of bills with discount band in rows, month in columns, and sales and margin as values, plus a slicer for store. Result: the pivot showed discounts above 20 percent added little volume but cut margin sharply, and the manager capped discounts at 15 percent the following month.

Match the chart to the question. Use column or bar charts to compare categories, line charts for trends over time, pie or doughnut only for a share of a whole with few slices, scatter charts for the relationship between two numbers, histograms for distribution, and combo charts when two measures with different scales belong together, such as sales and margin percentage. The simplest chart that answers the question is usually the best.

Use sparklines: select the 12 monthly values for all rows, choose Insert > Sparklines > Line and set the location to a column next to the data. Turn on high and low point markers, and under Axis choose the same minimum and maximum for all sparklines if branches should be compared fairly. They fit inside a cell, print well and update when the data changes.

Pie charts become unreadable with more than five or six slices, because people are poor at comparing angles. They cannot show change over time, and 3D or exploded pies distort sizes. Slices should add up to a meaningful whole; percentages from different bases should never be in one pie. A sorted bar chart almost always communicates the same information more clearly.

A chart has a chart title, plot area, horizontal and vertical axes, axis titles, data series, data labels, legend and gridlines. Click the plus button next to a chart to switch elements on or off, and select any element and press Ctrl+1 to open its format pane. Removing unnecessary gridlines and legends, and labelling series directly, usually makes charts cleaner.

Power Query (Data > Get & Transform) is Excel's tool to import, clean and reshape data from files, folders, databases and the web. Every action is recorded as a step, so next month you just click Refresh and the same cleaning runs again on new data. This removes repeated copy-paste work, reduces errors and keeps the original source untouched, which manual cleaning cannot offer.

Each transformation you click, like removing columns or changing types, is saved as a step in the Applied Steps pane, and the steps run in order on every refresh. Behind them is M, a functional formula language visible in the Advanced Editor. You can rename steps, delete or reorder them, and edit M directly for logic the interface does not provide, such as custom functions or dynamic column lists.

Append stacks tables one below another, like combining January, February and March sales that have the same columns; it is similar to SQL UNION. Merge joins two tables side by side on a matching key, like adding product category from a Products table to Sales; it is similar to a SQL JOIN or VLOOKUP. Choosing the right one is the first step in any multi-table task.

Select Transform > Group By, choose one or more grouping columns such as Region and Month, then add aggregations like Sum of Amount, Count Rows and Max of Order Date. The Advanced option allows several groupings and aggregations together. The All Rows operation keeps the detail rows as a nested table, useful for ranking within groups or picking the top record per customer.

The Data Model is an in-memory database inside the workbook, powered by the VertiPaq engine, which compresses data by column and can handle millions of rows, far beyond the sheet limit. Power Pivot is the window used to manage it: import tables, create relationships, and write DAX measures and calculated columns. Pivot tables built on the Data Model can combine several related tables without VLOOKUP.

A macro is a recorded or written set of instructions in VBA (Visual Basic for Applications) that automates repeated tasks, such as formatting a report or exporting PDFs. Normal .xlsx files cannot store macros, so the workbook must be saved as .xlsm (macro-enabled) or .xlsb. Macros can be run from the Developer tab, a button, a keyboard shortcut or automatically through events.

The recorder writes code for every click, including unnecessary Select statements and fixed cell addresses, so the macro breaks when data size changes. It cannot record loops, conditions or input boxes. By default it records absolute references; turning on Use Relative References records moves relative to the active cell. The recorder is great for learning syntax, but recorded code should be cleaned up by hand.

A Sub performs actions, such as formatting cells or saving files, and is run as a macro. A Function returns a value and can be used in worksheet formulas as a user-defined function or called from other code. Both are written in a standard module, opened through Alt+F11 > Insert > Module. Event code goes in the sheet or ThisWorkbook module instead.

Recorded macros use lines like Range("A1").Select followed by Selection.Copy, which are slow, flicker the screen and break if the user clicks another sheet while the macro runs. Refer to objects directly instead: Worksheets("Data").Range("A1:D100").Copy Worksheets("Report").Range("A1"). Fully qualifying the workbook and worksheet, often with a With block, makes the code faster and predictable.

Add Option Explicit at the top of every module, and enable Tools > Options > Require Variable Declaration so new modules get it automatically. VBA then refuses to run code that uses an undeclared variable and highlights the typo at compile time. Also declare proper types such as Long or Double instead of Variant, which catches type mistakes and makes the code faster and easier to read.

Trust Center settings control whether macros run: disabled with notification is typical. Files in a trusted location, or signed with a trusted digital certificate, run without prompts. Since 2022, Office blocks macros by default in files downloaded from the internet or email attachments that carry the Mark of the Web; users must unblock the file in its Properties. Organisations usually manage these settings through policy.

I enjoy turning raw numbers into reports that people actually use to decide things. During my studies and projects I built pivot dashboards and lookup-based trackers, and I liked seeing a three-hour manual task become a ten-minute refresh. An MIS role lets me build those skills daily, understand how the business runs, and grow towards analytics tools like Power BI and SQL, which build directly on Excel.