SELECt TRUNC(THE_DATE) as THE_DATE, USER_ID, FIRST_NAME, LAST_NAME, MAX(THE_DATE) - MIN(THE_DATE) as TOTAL_HRS FROM yourTableGROUP BY TRUNC(THE_DATE), USER_ID, FIRST_NAME, LAST_NAME
SELECt TRUNC(THE_DATE) as THE_DATE, USER_ID, FIRST_NAME, LAST_NAME, MAX(THE_DATE) - MIN(THE_DATE) as TOTAL_HRS FROM yourTableGROUP BY TRUNC(THE_DATE), USER_ID, FIRST_NAME, LAST_NAME
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