PostgreSQL Exercises

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Working with dates

Question

How can you produce a list of members who joined after the start of September 2012? Return the memid, surname, firstname, and joindate of the members in question.
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Expected Results

memid surname firstname joindate
24 Sarwin Ramnaresh 2012-09-01 08:44:42
26 Jones Douglas 2012-09-02 18:43:05
27 Rumney Henrietta 2012-09-05 08:42:35
28 Farrell David 2012-09-15 08:22:05
29 Worthington-Smyth Henry 2012-09-17 12:27:15
30 Purview Millicent 2012-09-18 19:04:01
33 Tupperware Hyacinth 2012-09-18 19:32:05
35 Hunt John 2012-09-19 11:32:45
36 Crumpet Erica 2012-09-22 08:36:38
37 Smith Darren 2012-09-26 18:08:45

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Answers and Discussion Show

          
select memid, surname, firstname, joindate 
	from cd.members
	where joindate >= '2012-09-01';          

          

            

This is our first look at SQL timestamps.  They're formatted in descending order of magnitude: YYYY-MM-DD HH:MM:SS.nnnnnn.  We can compare them just like we might a unix timestamp, although getting the differences between dates is a little more involved (and powerful!).  In this case, we've just specified the date portion of the timestamp.  This gets automatically cast by postgres into the full timestamp 2012-09-01 00:00:00.            

          

        

      

      
      

        
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Look up the SQL timestamp format, and remember that you can compare dates much like you would integer values.
      

      

        

	  
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