Question

I have a database table that is full of transactions transactionIDs and datetime fields.
As you would guess, the datetime field and transactionIDs are constantly increasing and the balance field is either increasing / staying the same / or decreasing.

I would like to extract the highest transactionID and its corresponding balance at the end of every day.

Thank you in advance for your time and assistance.

Sample Table Format:

transactionID|date (datetime)|amount|balance|

Answer 1

SELECT 
  t1.`date`,
  t1.transactionID,
  t2.balance
FROM
  (
    SELECT
      `date`,
      MAX(transactionID) AS `transactionID`
    FROM
      table
    GROUP BY
      DATE(`date`)
  ) t1
INNER JOIN
  table t2
ON
  t2.transactionID = t1.transactionID
ORDER BY
  t1.`date`