Question

I have query that goes like that :

SELECT  DISTINCT 
        S.date1 AS date1, 
        S.date2 AS date2,
        S.period AS period

FROM portfolio.scenario S 

WHERE S.date1 >= '2010-06-01' AND
      S.date2 <= '2010-07-01' AND
      S.period = 'WEEK'

The output is :

"2010-06-01 00:00:00","2010-06-08 00:00:00",WEEK
"2010-06-02 00:00:00","2010-06-09 00:00:00",WEEK
"2010-06-03 00:00:00","2010-06-10 00:00:00",WEEK
"2010-06-04 00:00:00","2010-06-11 00:00:00",WEEK
"2010-06-07 00:00:00","2010-06-14 00:00:00",WEEK
"2010-06-08 00:00:00","2010-06-15 00:00:00",WEEK
"2010-06-09 00:00:00","2010-06-16 00:00:00",WEEK
"2010-06-10 00:00:00","2010-06-17 00:00:00",WEEK
"2010-06-11 00:00:00","2010-06-18 00:00:00",WEEK
"2010-06-14 00:00:00","2010-06-21 00:00:00",WEEK
"2010-06-15 00:00:00","2010-06-22 00:00:00",WEEK
"2010-06-16 00:00:00","2010-06-23 00:00:00",WEEK
"2010-06-17 00:00:00","2010-06-24 00:00:00",WEEK
"2010-06-18 00:00:00","2010-06-25 00:00:00",WEEK
"2010-06-21 00:00:00","2010-06-28 00:00:00",WEEK
"2010-06-22 00:00:00","2010-06-29 00:00:00",WEEK
"2010-06-23 00:00:00","2010-06-30 00:00:00",WEEK
"2010-06-24 00:00:00","2010-07-01 00:00:00",WEEK

What i need are only the consecutive dates startest with earliest date1 ;

    "2010-06-01 00:00:00","2010-06-08 00:00:00",WEEK
    "2010-06-08 00:00:00","2010-06-15 00:00:00",WEEK
    "2010-06-15 00:00:00","2010-06-22 00:00:00",WEEK
    "2010-06-22 00:00:00","2010-06-29 00:00:00",WEEK

Appreciate any help on the topic 🙂

Answer 1

It’s not optimum for performance to use functional clauses, but this will do the trick as long as the S.period remains at a week.

SELECT  DISTINCT 
        S.date1 AS date1, 
        S.date2 AS date2,
        S.period AS period

FROM portfolio.scenario S 

WHERE S.date1 >= '2010-06-01' AND
      S.date2 <= '2010-07-01' AND
      S.period = 'WEEK' AND
      DAYOFWEEK(S.date1) = DAYOFWEEK('2010-06-01');