In most DBMSs, you can only have one clustered index per table, though there are systems that support multiple clusters (DB2 being an example). Like a regular index that is stored unsorted in a database table, a clustered index can be a composite index, such as a concatenation of first name and last name in a table of personal information. Share this:
Best Answer: Four laps equals one mile on the track. (1600) Two laps is a half mile. (800m) The track is divided into four 100m parts for it to equal one lap. Therefore, 400m equals one lap. Also, usually on a high school track, there are 6 lanes. I hope I didn't confuse you.
Use a stopwatch to time how long it takes you to run a mile. Once you have an exact time - whether it's 8 minutes or 16 minutes - you can work on improving it! This is where running on a track comes in handy, as each 400M lap of the track is equal to 1/4 of a mile, so four laps of the track is equal to one mile.