## Extract a list of alphabetically sorted duplicates based on a condition

The following image shows you a data set in column B and C. The formula in cell E2 extracts a list of duplicates sorted from A to Z based on a condition in cell F2.

"Fishing rod" is a duplicate value in column C but it is not in category "Winter", however "Skates" and "Sledge" are duplicates and in category "Winter.

**Array formula in cell E5:**

The following article shows you how to filter unique distinct values sorted alphabetically and based on a condition:

Unique distinct list sorted alphabetically based on a condition

The array formula in cell E6 filters values in column C based on value in cell E3, the output is [โฆ]

Unique distinct list sorted alphabetically based on a condition

### How to enter array formula

- Copy (Ctrl + c) above formula
- Double click on cell E5
- Paste formula to cell E5
- Press and hold CTRL + SHIFT simultaneously
- Press Enter once
- Release all keys

The formula now looks like this: {=*arrayformula*}

Don't enter the curly brackets yourself, they appear automatically.

Array formulas allows you to do advanced calculations not possible with regular formulas.

### Explaining formula in cell E5

You can easily follow along, select cell E5. Go to tab "Formulas" on the ribbon and click "Evaluate Formula" button.

Then click "Evaluate" button to move to next step.

**Step 1 - Check if category is right and return count**

**Step 1 - Check if category is right and return count**

COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1

becomes

COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1

becomes

COUNTIFS({"Winter"; "Winter"; "Winter"; "Summer"; "Winter"; "Summer"; "Winter"},"Winter",{"Skates"; "Ski"; "Skates"; "Fishing rod"; "Sledge"; "Fishing rod"; "Sledge"},{"Skates"; "Ski"; "Skates"; "Fishing rod"; "Sledge"; "Fishing rod"; "Sledge"})>1

and returns

{2;1;2;0;2;0;2}

How to use the COUNTIFS function

Checks multiple conditions against the same number of cell ranges and counts how many times all criteria are met.

How to use the COUNTIFS function

**Step 2 - Check if count is larger than 1 **

**Step 2 - Check if count is larger than 1**

This allows us to filter duplicate values.

COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1

becomes

{2;1;2;0;2;0;2}>1

and returns {TRUE; FALSE; TRUE; FALSE; TRUE; FALSE; TRUE}

**Step 3 - Count previous values in list**

**Step 3 - Count previous values in list**

COUNTIF($E$4:E4, $C$3:$C$9)

returns {0;0;0;0;0;0;0}

How to use the COUNTIF function

Counts the number of cells that meet a specific condition.

How to use the COUNTIF function

**Step 4 - Check if they have not been shown before**

**Step 4 - Check if they have not been shown before**

This makes sure that previous values in column E are not repeated.

COUNTIF($E$4:E4, $C$3:$C$9)>0

becomes

{0;0;0;0;0;0;0}=0

and returns {TRUE; TRUE; TRUE; TRUE; TRUE; TRUE; TRUE}

**Step 5 - Multiply arrays**

**Step 5 - Multiply arrays**

(COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1)*(COUNTIF($E$4:E4, $C$3:$C$9)=0)

becomes

{TRUE; FALSE; TRUE; FALSE; TRUE; FALSE; TRUE}*{TRUE; TRUE; TRUE; TRUE; TRUE; TRUE; TRUE}

and returns {1;0;1;0;1;0;1}

**Step 6 - Build an array of sort ranking numbers**

**Step 6 - Build an array of sort ranking numbers**

COUNTIF($C$3:$C$9, "<"&$C$3:$C$9) returns {2;4;2;0;5;0;5}

**Step 7 - Return corresponding sort rank number**

**Step 7 - Return corresponding sort rank number**

IF((COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1)*(COUNTIF($E$4:E4, $C$3:$C$9)=0), COUNTIF($C$3:$C$9, "<"&$C$3:$C$9), "")

becomes

IF({1;0;1;0;1;0;1},{2;4;2;0;5;0;5}, "")

and returns {2;"";2;"";5;"";5}

Checks if a logical expression is met. Returns a specific value if TRUE and another specific value if FALSE.

**Step 8 - Find the n-th smallest number**

**Step 8 - Find the n-th smallest number**

SMALL(IF((COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1)*(COUNTIF($E$4:E4, $C$3:$C$9)=0), COUNTIF($C$3:$C$9, "<"&$C$3:$C$9), ""), ROWS($A$1:A1))

becomes

SMALL({2;"";2;"";5;"";5}, ROWS($A$1:A1))

becomes

SMALL({2;"";2;"";5;"";5}, 1)

and returns 2.

The SMALL function lets you extract a number in a cell range based on how small it is compared to the other numbers in the group.

**Step 9 - Get position of value in array**

**Step 9 - Get position of value in array**

MATCH(SMALL(IF((COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1)*(COUNTIF($E$4:E4, $C$3:$C$9)=0), COUNTIF($C$3:$C$9, "<"&$C$3:$C$9), ""), ROWS($A$1:A1)), COUNTIF($C$3:$C$9, "<"&$C$3:$C$9), 0)

becomes

MATCH(2, COUNTIF($C$3:$C$9, "<"&$C$3:$C$9), 0)

becomes

MATCH(2, {2;4;2;0;5;0;5}, 0)

and returns 1.

Identify the position of a value in an array.

**Step 10 - Return value in data set based on coordinate**

**Step 10 - Return value in data set based on coordinate**

INDEX($C$3:$C$9, MATCH(SMALL(IF((COUNTIFS($B$3:$B$9, $F$2, $C$3:$C$9, $C$3:$C$9)>1)*(COUNTIF($E$4:E4, $C$3:$C$9)=0), COUNTIF($C$3:$C$9, "<"&$C$3:$C$9), ""), ROWS($A$1:A1)), COUNTIF($C$3:$C$9, "<"&$C$3:$C$9), 0))

becomes

INDEX($C$3:$C$9, 1)

becomes

INDEX({"Skates";"Ski";"Skates";"Fishing rod";"Sledge";"Fishing rod";"Sledge"}, 5)

and returns "Skates" in cell E5.

Gets a value in a specific cell range based on a row and column number.

### Download excel *.xlsx file

Filter duplicates sorted from A to Z based on a condition.xlsx

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Array formula in D2: =INDEX($A$2:$A$21, MATCH(SMALL(IF(COUNTIF($B$2:$B$21, $B$2:$B$21)>1, COUNTIF($A$2:$A$21, "<"&$A$2:$A$21), ""),ROWS($A$1:A1)), COUNTIF($A$2:$A$21, "<"&$A$2:$A$21), 0)) Array formula in E2: =INDEX($B$2:$B$21, MATCH(SMALL(IF(COUNTIF($B$2:$B$21, $B$2:$B$21)>1, [โฆ]

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