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.
From the first Olympics, in 1896, the one lap distance was always 400m so there is no Olympic quarter mile record. Some people (especially older British people) still call a 400m runner a quarter miler.