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SQL Puzzle | The Event Puzzle
We have a table called events. Events Table has eventKey, objectID, EventDate and eventType. We want a select query which will lists all the objectID that have an event of eventType ‘X’ with an eventType ‘Y’ whos eventdate should be smaller than the eventdate of X eventtype. Each objectID should must have X and Y event for qualification.
For details please check out the sample input and the expected output below.
|1||1||1/1/16 12:00 AM||X|
|2||1||1/2/16 12:00 AM||Y|
|3||2||1/1/16 12:00 AM||X|
|4||2||1/2/16 12:00 AM||Y|
|5||3||1/2/16 12:00 AM||X|
|6||3||1/1/16 12:00 AM||Y|
- The challenge is to do it with T-SQL statements only.
- Add your solution(s) in the comments section or send you solution(s) to firstname.lastname@example.org
Script | use below script to create table and insert some sample data
-- CREATE TABLE Events ( EventId INT , ObjectId INT , EventDate DATETIME , EventType CHAR(1) ) GO INSERT INTO Events VALUES (1, 1, '2016-01-01 00:00:00', 'X'), (2, 1, '2016-01-02 00:00:00', 'Y'), (3, 2, '2016-01-01 00:00:00', 'X'), (4, 2, '2016-01-02 00:00:00', 'Y'), (5, 3, '2016-01-02 00:00:00', 'X'), (6, 3, '2016-01-01 00:00:00', 'Y') GO --
SOLUTION – 1
-- SELECT tbl.objectid, MAX(tbl.eventdate) eventdate FROM Events tbl JOIN Events tbl2 ON tbl.objectid = tbl2.objectid AND tbl2.eventtype = 'Y' AND tbl.eventdate > tbl2.eventdate WHERE tbl.eventtype='X' GROUP BY tbl.objectid --
SOLUTION – 2
-- SELECT tbl.objectid, tbl.eventdate FROM Events tbl OUTER APPLY (SELECT MAX(tbl1.eventdate) eventdate FROM Events tbl1 WHERE tbl1.eventtype='Y' AND tbl.objectid = tbl1.objectid) tbl2 WHERE tbl.eventtype='X' AND tbl.eventdate > tbl2.eventdate --
SOLUTION – 3
-- SELECT t1.objectid, t1.eventdate FROM ( SELECT tbl.objectid, tbl.eventtype, tbl.eventdate FROM Events tbl WHERE eventtype='X' GROUP BY tbl.objectid, tbl.eventtype, tbl.eventdate HAVING tbl.eventdate = MAX(tbl.eventdate)) t1 JOIN ( SELECT tbl.objectid, tbl.eventtype, tbl.eventdate FROM Events tbl WHERE eventtype='Y' GROUP BY tbl.objectid, tbl.eventtype, tbl.eventdate HAVING tbl.eventdate = MAX(tbl.eventdate)) t2 ON t1.objectid = t2.objectid AND t1.eventdate > t2.eventdate --
SOLUTION – 4
-- select x.objectID, max(x.EventDate) as max_EventDate from Events x left join Events y on x.objectID = y.objectID and x.EventDate > y.EventDate and y.eventType = 'Y' where x.eventType = 'X' group by x.objectID having count(y.objectID) > 0 --
Add a comment if you have a solution in mind. I would love to learn it. We all need to learn.
Enjoy !!! Keep Learning