How do I find the length (size) of a binary blob in sqlite

Question

I have an sqlite table that contains a BLOB file, but need to do a size/length check on the blob, how do I do that?

According to some documentation I did find, using

Answer 1

Example of a select query that does this, getting the length of the blob in column myblob, in table mytable, in row 3:

select length(myblob) from mytable where rowid=3;