SQL Exercises: Salesman details by smallest ID along with order date
SQL Formatting Output: Exercise-7 with Solution
From the following table, write a SQL query that calculates the maximum purchase amount generated by each salesperson for each order date. Sort the result-set by salesperson id and order date in ascending order. Return salesperson id, order date and maximum purchase amount.
Sample table: orders
Sample Solution :
SELECT salesman_id,ord_date,MAX(purch_amt)
FROM orders
GROUP BY salesman_id,ord_date
ORDER BY salesman_id,ord_date;
Output of the Query:
salesman_id ord_date max 5001 2012-04-25 3045.60 5001 2012-07-27 2400.60 5001 2012-09-10 5760.00 5001 2012-10-05 65.26 5002 2012-06-27 250.45 5002 2012-09-10 948.50 5002 2012-10-05 150.50 5003 2012-08-17 110.50 5003 2012-10-10 2480.40 5005 2012-09-10 270.65 5006 2012-10-10 1983.43 5007 2012-08-17 75.29
Relational Algebra Expression:

Relational Algebra Tree:

Explanation :

Pictorial presentation :

Practice Online
Query Visualization:
Duration:

Rows:

Cost:

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Previous: From the following table, write a SQL query to find all the customers. Sort the result-set by customer_id. Return cust_name, city, grade.
Next: From the following table, write a SQL query to find all the customers. Sort the result-set in descending order on 3rd field. Return customer name, city and grade.
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SQL: Tips of the Day
Copy data into another table
If both tables are truly the same schema:
INSERT INTO newTable SELECT * FROM oldTable
Otherwise, you'll have to specify the column names (the column list for newTable is optional if you are specifying a value for all columns and selecting columns in the same order as newTable's schema):
INSERT INTO newTable (col1, col2, col3) SELECT column1, column2, column3 FROM oldTable
Ref: https://bit.ly/3jMQkbA
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