Question
Given the following tables: Orders (OrderID,
CustomerID, OrderDate) and Customers (CustomerID, CustomerName, City), what SQL query will return the names of customers who have placed orders in 'New York' within the last 30 days?Solution
The correct query utilizes a JOIN between the Customers and Orders tables on the CustomerID field. This allows you to filter customers who are located in 'New York' and have placed an order in the last 30 days. The JOIN ensures that only customers who have an associated order are included, and the date condition (OrderDate >= CURDATE() - INTERVAL 30 DAY) filters for recent orders. Why Other Options Are Wrong : A) Incorrect : The query attempts to filter customers directly, but it fails to include the necessary JOIN with the Orders table, which is crucial for retrieving orders placed by customers in 'New York'. C) Incorrect : This query incorrectly selects from the Orders table and does not filter by customer details. The City column does not exist in the Orders table. D) Incorrect : This query incorrectly attempts to select data from the Customers table without joining it with the Orders table, so there will be no filtering by order date. E) Incorrect : Although the JOIN is correctly applied, this query places the conditions in the wrong order, and the query logic would still be correct but unnecessarily complex.
Pipe ‘A’ and pipe ‘B’ can fill a cistern in 20 minutes and 15 minutes respectively. Pipe ‘C’ alone can empty the cistern in 12 minutes. If a...
24, 29, 62, ?, 758, 3791
...The mean of 10 observations is 8. One more observation is added, and the new mean becomes 9. What is the value of the 11th observation?
The marks obtained by 12 students out of a maximum of 30 in a test are given as 25, 28, 24, 22, 25, 18, 20, 22, 19, 23, 22, and 26. Find the sum of the ...
The areas of three adjacent faces of a cuboid are 32 cm2,24cm2 and 48cm2.Find the volume of cuboid.(in cm) 3
Meera buys a laptop and sells it to Sneha at a profit of 25%. Sneha then sells it to Tushar at a loss of 10%. If Tushar buys the laptop for Rs. 36,450, ...
The mean of the sample data = 60 and median = 48. Find the mode of this distribution.
If the sum of n numbers in the GP 3, 6, 12, ... is 765 then n is?
15 is divided in three parts which are in arithmetic progression (A.P.) in such a way that the sum of their square is 83. Find the smallest part?
What will be the mode of the following data?
13, 15, 31, 12, 27, 13, 27, 30, 27, 28 and 16