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SQL Order by Count

SQL Order by Count

Introduction of SQL Order by Count

ORDER BY COUNT clause in standard query language(SQL) is used to sort the result set produced by a SELECT query in an ascending or descending order based on values obtained from a COUNT function. For uninitiated, a COUNT() function is used to find the total number of records in the result set. It is usually used in combination with the GROUP BY clause to prepare a summary of the total number of records in each group. It can further be used with ORDER BY clause to sort the obtained summary table.

By default the ORDER BY statement arranges the result set in ascending order. If we want to sort it in descending order then we might have to specifically mention the DESC keyword.

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Nonetheless, we will be discussing ORDER BY COUNT() in detail in subsequent sections. Let’s begin with syntax and parameters used for sorting results by COUNT().

Syntax and Parameters

The basic syntax used for writing SELECT query with ORDER BY COUNT() clause is as follows:

SELECT column_name_1, column_name_2
FROM
table_name
GROUP BY column_name_1
ORDER BY COUNT(column_name_2) ASC | DESC;

The parameters used in the above mentioned syntax are as follows :

column_name_1, column_name_2, ..., column_name_n : columns or fields that have to be

fetched for the final result set

  • table_name: Database table from which the above mentioned columns have to be fetched.
  • GROUP BY column_name_1: column according to which the result set has to be grouped together for counting.
  • COUNT(column_name_2): Column whose values have to be counted and then used as input for ORDER BY clause to sort the result set.
  • ASC | DESC: Order of sorting as in ascending(ASC) or descending(DESC)

Having learnt the syntax and parameters used for writing ORDER BY clauses, let us try a few examples to understand the concept in detail.

Examples of SQL Order by Count

In order to illustrate the working of the ORDER BY COUNT() statement, let us create a dummy table named  “product_details”. This table contains details pertaining to sales such as product_id, sale_date, etc. for a departmental store. We can use the following CREATE TABLE statement to create the table.

CREATE TABLE product_details
(
product_id integer NOT NULL,
sale_date date NOT NULL,
sale_amount numeric NOT NULL,
salesperson character varying(255) NOT NULL,
store_state character varying(255) NOT NULL,
);

The table has been successfully created. Let’s insert the following values in it to work with. Use the given insert statement.

INSERT INTO product_ details(
product_id, sale_date, sale_amount, salesperson, store_state)
VALUES (1,'2020-05-06', 2300,'X','DL'),
(2, '2020-05-06',5300,'Y','DL'),
(3, '2020-05-06',300,'X','MH'),
(4, '2020-05-07',4200,'Y','MH'),
(5, '2020-05-07',900,'Y','MH'),
(6, '2020-05-05',600,'X','DL'),
(7, '2020-05-05',1450,'Y','MH'),
(8, '2020-05-05',987,'X','MH'),
(8, '2020-02-04',1234,'X','DL'),
(8, '2020-02-04',1234,'X','RJ'),
(9, '2020-02-06',543,'X','RJ');
select * from product_details;

SQL Order by Count-1.1

Now we are all set to discuss a few examples based on ORDER BY COUNT() with the help of product_details table.

Basic functionality of COUNT() function

SELECT COUNT(*)
FROM product_details;

SQL Order by Count-1.2

COUNT () function returns the total number of rows in the result set.

SQL queries to illustrate basic functionality of ORDER BY COUNT()

Example #1

Find the number of sales made by each salesperson and arrange from lowest to highest.

SELECT salesperson, count(product_id)
FROM product_details
GROUP BY salesperson
ORDER BY count(product_id);

SQL Order by Count-1.3

The query first groups the results by salesperson, then counts the number of product_ids corresponding to each group and finally sorts the result set according to the value returned by the count() function.

Example #2

Find the number of sales made by each salesperson and arrange the result from highest to lowest.

SELECT salesperson, count(product_id)
FROM product_details
GROUP BY salesperson
ORDER BY count(product_id) DESC;

Output-1.4

In order to sort a given result set in descending order, we use the DESC keyword.

Example #3

Find the number of sales made in each store location, arranged from lowest to highest.

SELECT store_state, count(product_id)
FROM product_details
GROUP BY store_state
ORDER BY count(product_id);

Output-1.5

ORDER BY COUNT() statement with COUNT(DISTINCT field_name) function.

Example #4

Find the number of distinct products sold by each salesperson, arranged from lowest to highest.

SELECT salesperson, count( DISTINCT product_id)
FROM product_details
GROUP BY salesperson
ORDER BY count(DISTINCT product_id);

Output-1.6

When the DISTINCT keyword is used in conjunction with COUNT, it returns the number of unique records in the specified column. In this case, even though there are 11 product_ids but only 9 unique ones are counted.

ORDER BY COUNT() statement with more than one count() functions

Example #5

Find the number of sales and unique salespersons for each store location, arranged from highest to lowest count of salesperson and from lowest to highest by number of sales in case of tie.

SELECT store_state,
count(product_id) as "total_products",
count( DISTINCT salesperson) as "total_salespeople"
FROM product_details
GROUP BY store_state
ORDER BY count(DISTINCT salesperson) DESC, count(product_id) ASC;

Output-1.7

Recommended Articles

This is a guide to SQL Order by Count. Here we also discuss the syntax and parameters of sql order by count along with different examples and its code implementation. You may also have a look at the following articles to learn more –

  1. SQL AFTER UPDATE Trigger
  2. SQL Table Partitioning
  3. SQL NOT Operator
  4. MySQL Lock Table
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