Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Management is considering closing on Sundays and would like to have a feeling for the kinds of customers that come to the dealership on Sunday. Create a totals query that shows the count of encounters on the Sundays of July 2015—grouped by the credit description held by the customer of the encounter. The Sundays in July of 2015 are the 5th, 12th, 19th, and 26th. Your answer should have two columns (CreditDescription and encounter_count) and should be sorted alphabetically by credit description. 

This is what Ive been working with and doesn't give me results, just error messages. 
SELECT R.CreditDescription, E.CustomerID
FROM Encounter E
JOIN Customer C ON E.CustomerID = C.CustomerID
JOIN CreditRating R ON C.CreditID = R.CreditID
WHERE E.EncDate = STR_TO_DATE('2015-07-05','2015-07-12','2015-07-19','2015-07-26');
ORDER BY creditrating.creditid, ASC;
  •  
  • creditrating
    • creditid
    • creditdescription
    • minfico
    • maxfico
    • comments
    • customer
      • customerid
      • cfirstname
      • clastname
      • cphone
      • annualincome
      • creditid
    •  
      encounter
      • encid
      • salesid
      • customerid
      • encdate
      • purchase
    •  
      salesperson
      • salesid
      • sfirstname
      • slastname
      • shiredate
      • salary
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