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SQL Exercises: Count the number of salesmen who register orders each day

SQL Aggregate Functions: Exercise-20 with Solution

From the following table, write a SQL query to count the number of orders based on the combination of each order date and salesperson. Return order date, salesperson id.

Sample table: orders


Sample Solution:

SELECT ord_date,salesman_id,COUNT(*) 
FROM orders 
GROUP BY ord_date,salesman_id;

Output of the Query:

ord_date	salesman_id	count
2012-07-27	5001		1
2012-08-17	5007		1
2012-04-25	5001		1
2012-09-10	5002		1
2012-10-05	5002		1
2012-10-10	5003		1
2012-09-10	5005		1
2012-08-17	5003		1
2012-06-27	5002		1
2012-09-10	5001		1
2012-10-05	5001		1
2012-10-10	5006		1

Relational Algebra Expression:

Relational Algebra Expression: Count the number of salesmen registering orders for each day.

Relational Algebra Tree:

Relational Algebra Tree: Count the number of salesmen registering orders for each day.

Explanation:

Syntax of counts the number of salesmen with their order date and ID registering orders for each day

Pictorial presentation:

Syntax of counts the number of salesmen with their order date and ID registering orders for each day

Practice Online


Query Visualization:

Duration:

Query visualization of Count the number of salesmen registering orders for each day - Duration

Rows:

Query visualization of Count the number of salesmen registering orders for each day - Rows

Cost:

Query visualization of Count the number of salesmen registering orders for each day - Cost

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Previous: From the following table, write a SQL query to count number of salespeople who belongs to a city. Return number of salespeople.
Next: From the following table, write a SQL query to calculate the average product price. Return average product price.

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SQL: Tips of the Day

SQL Server SELECT into existing table. 

INSERT INTO dbo.TABLETWO
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:

INSERT INTO dbo.TABLETWO
  (col1, col2)
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

Database: SQL Server

Ref: https://bit.ly/3y6tpA3