SQL Exercises: Find the total purchase amount for all orders
SQL Aggregate Functions: Exercise-1 with Solution
From the following table, write a SQL query to calculate total purchase amount of all orders. Return total purchase amount.
Sample table: orders
SELECT SUM (purch_amt) FROM orders;
Output of the Query:
The said query in SQL retrieve the sum of values in the "purch_amt" column from the 'orders' table.
The "SELECT SUM (purch_amt)" statement specifies that the sum of the values in the "purch_amt" column should be retrieved. The result of this query will be a single value that represents the sum of all values in the "purch_amt" column in the 'orders' table.
Relational Algebra Expression:
Relational Algebra Tree:
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SQL: Tips of the Day
What is the best way to paginate results in SQL Server?
SELECT * FROM ( SELECT ROW_NUMBER() OVER ( ORDER BY OrderDate ) AS RowNum, * FROM Orders WHERE OrderDate >= '1980-01-01' ) AS RowConstrainedResult WHERE RowNum >= 1 AND RowNum < 20 ORDER BY RowNum
Database: SQL Server
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