Problem in DB requests using if()s

[nikos]

This does not work well some parts of if work and some others don't:

		if name and month.isdigit() and year.isdigit():
			cur.execute( '''SELECT * FROM jobs WHERE clientID = (SELECT id FROM clients WHERE name = %s) and MONTH(lastvisit) = %s and YEAR(lastvisit) = %s ORDER BY lastvisit DESC''', (name, month, year) )

		elif name and year.isdigit():
			cur.execute( '''SELECT * FROM jobs WHERE clientID = (SELECT id FROM clients WHERE name = %s) and YEAR(lastvisit) = %s ORDER BY lastvisit DESC''', (name, year) )

		elif month.isdigit() and year.isdigit():
			cur.execute( '''SELECT * FROM jobs WHERE MONTH(lastvisit) = %s and YEAR(lastvisit) = %s ORDER BY lastvisit DESC''', (month, year) )

		elif year.isdigit():
			cur.execute( '''SELECT * FROM jobs WHERE YEAR(lastvisit) = %s ORDER BY lastvisit ASC''', year )

Please helpe me write it correctly and simply.