Rsa97

switch (true) {
  case ($x > 5):
    ...
    break;
  case ($x < 1):
    ...
    break;
  default:
    ...
}

SELECT CONCAT(`h`.`hour`, ':', `m`.`minute`, ':00')
FROM (
  SELECT '09' AS `hour`
  UNION SELECT '10'
  UNION SELECT '11'
  UNION SELECT '12'
  UNION SELECT '13'
  UNION SELECT '14'
  UNION SELECT '15'
  UNION SELECT '16'
  UNION SELECT '17'
) AS `h`
JOIN (
  SELECT '00' AS `minute`
  UNION SELECT '15'
  UNION SELECT '30'
  UNION SELECT '45'
) AS `m`