COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Notes WHERE FilePath = '/documents/doc.txt'

COUNT(DISTINCT)

Returns the number of distinct, non-null field values matching the query criteria.

SELECT COUNT(DISTINCT Filesize) AS DistinctValues FROM Notes WHERE FilePath = '/documents/doc.txt'

AVG

Returns the average of the column values.

SELECT Filename, AVG(FileSize) FROM Notes WHERE FilePath = '/documents/doc.txt'  GROUP BY Filename

MIN

Returns the minimum column value.

SELECT MIN(FileSize), Filename FROM Notes WHERE FilePath = '/documents/doc.txt' GROUP BY Filename

MAX

Returns the maximum column value.

SELECT Filename, MAX(FileSize) FROM Notes WHERE FilePath = '/documents/doc.txt' GROUP BY Filename

SUM

Returns the total sum of the column values.

SELECT SUM(FileSize) FROM Notes WHERE FilePath = '/documents/doc.txt'