SQL implementation calls the latest Five list thumbnails.

SQL calls the latest Five list thumbnails for help .. {Dede: sqlsql = & quot; SELECTtypename, typedir, typeimgFROMdede_arctypewhereid & gt; 7 & quot;} & lt; li & gt; & lt; SQL calls the latest Five list thumbnails for help ..
{Dede: SQL = "SELECT typename, typedir, typeimg FROM dede_arctype where id> 7 "}

[Field: typename/]

{/Dede: SQL}

I used this statement to call up all list thumbnails, but in this case, all thumbnails are called .... But now I want to add a function so that he can only call the latest five messages.
I checked some information and I think many people added the limit statement to the end .. But I really don't understand this. please help me write a code.

------ Solution --------------------
SELECT typename, typedir, typeimg FROM dede_arctype where id> 7 order by time desc limit 5
------ Solution --------------------
How is the latest field represented? for the order by field desc limit 5