Get counts of each sub-group within main

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I would like to get the counts of each sub-group that appear in the main group.

Given the following:

| Clothing    | Colour
-----------------------
| Shirt       | black   
| Shirt       | black  
| Shirt       | black
| Shirt       | yellow 
| Shoes       | yellow
| Shoes       | yellow
| Shoes       | black

My desired output would be:

| A                    | B
---------------------------
| Shirt_Blacks         | 3 
| Shirt_Yellows        | 1
| Shoes_Blacks         | 1
| Shoes_Yellows        | 2

EDIT: Output format 2:

| Clothing       | Black | Yellow
-----------------------------------
| Shirt          | 3     | 1
| Shoes          | 1     | 2

Tried the following with no luck:

SELECT COUNT(Colour) 
FROM [randomtable]
Group By Clothing

Use aggregation:

SELECT CONCAT(Clothing, '_', Colour) A, COUNT(*) B
FROM mytable
GROUP BY Clothing, Colour

Demo on DB Fiddle:

A            |  B
:----------- | -:
Shirt_black  |  3
Shoes_black  |  1
Shirt_yellow |  1
Shoes_yellow |  2

If you are looking to pivot the resultset, then:

SELECT 
    Clothing,
    SUM(CASE WHEN Colour = 'Black' THEN 1 ELSE 0 END) Black,
    SUM(CASE WHEN Colour = 'Yellow THEN 1 ELSE 0 END) Yellow
FROM mytable
GROUP BY Clothing

Solved: Count of items within Subgroups, Solved: Hi folks, I'm looking for help counting items within groups and subgroups. I have a spreadsheet containing a list of workpacks and each. GROUP BY command will create groups in the field name specified and will count the number of records in the groups. This is very useful command. We can also use WHERE command along with GROUP BY command in Mysql tables. SELECT count (*) as total_records, class FROM `student` group by class. This will display the total records in each class.

You can group by concat(clothing, '_', colour):

SELECT
  concat(clothing, '_', colour) A, 
  COUNT(*) B
FROM [randomtable]
Group By concat(clothing, '_', colour) 

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SELECT Clothing+'_'+Colour A, COUNT(*) B
    FROM [randomtable]
GROUP BY Clothing+'_'+Colour

select * from [randomtable]
    pivot
(count(colour) for colour in (black,yellow))AS piv

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Summarize Your SQL Results with the GROUP BY clause, The SQL GROUP BY Clause is used to output a row across specified column values. Rather than returning every row in a table, when values are grouped, only the For instance, to count all SalesOrderDetails records we could use the Use MIN and MAX to find the smallest and largest values, respectively, within a � > group by dept then count and within that dept get the count for the loc > That isn't even the same list of columns you had in the original post > select id, names, dept, loc, country, gender from details > The last post doesn't even show id, names or gender > ive never used analytical functions that much > focus on defining the problem first

Comments
  • Thank you! One more question please. I made an edit to my post in terms of output format. How must I adjust the query to generate output format 2? Thanks again mate! :-)
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