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Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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206 10 (Optional, Advanced) 207 -- Write a query that returns for each order the number of days that past 208 since the same customer's previous order. To determine recency among orders, use orderdate as the primary sort element and orderid as the tiebreaker. 210 -- Tables involved: TSQLV4 database, Sales.Orders table 209 -- -- 211 212 -- Desired output: 213 custid 214 215 1 216 1 217 1 218 1 219 1 220 1 221 2 222 2 223 2 224 2 225... orderdate orderid 2015-08-25 10643 2015-10-03 10692 2015-10-13 10702 2016-01-15 10835 2016-03-16 10952 2016-04-09 11011 2014-09-18 10308 2015-08-08 10625 2015-11-28 10759 2016-03-04 10926 226 227 (830 row(s) affected) diff NULL 39 10 94 61 24 NULL 324 112 97
Transcribed Image Text:206 10 (Optional, Advanced) 207 -- Write a query that returns for each order the number of days that past 208 since the same customer's previous order. To determine recency among orders, use orderdate as the primary sort element and orderid as the tiebreaker. 210 -- Tables involved: TSQLV4 database, Sales.Orders table 209 -- -- 211 212 -- Desired output: 213 custid 214 215 1 216 1 217 1 218 1 219 1 220 1 221 2 222 2 223 2 224 2 225... orderdate orderid 2015-08-25 10643 2015-10-03 10692 2015-10-13 10702 2016-01-15 10835 2016-03-16 10952 2016-04-09 11011 2014-09-18 10308 2015-08-08 10625 2015-11-28 10759 2016-03-04 10926 226 227 (830 row(s) affected) diff NULL 39 10 94 61 24 NULL 324 112 97
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The question asks for an SQL query that calculates the number of days that have passed since the previous order for each customer, using the order date as the primary sorting criterion and the order ID as a tiebreaker. The goal is to determine the recency of orders among customers.

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