The PostgreSQL function gets the numeric size value of multiple fields

1,Greatest (n1,n2,n3,..........) Get maximum value

Testdb= #SELECT Greatest (3,5,1,8, -, About, the, -, the, +); +---------------------------------------------------------+ | Greatest (3,5,1,8, -, About, the, -, the, +)                     | +---------------------------------------------------------+ | About| +---------------------------------------------------------+1Rowinch Set(0.00Sec

2,LEAST (n1,n2,n3,n4,......) get the minimum value

testdb= #SELECT LEAST (3,5,1,8, -, About, the, -, the, +); +---------------------------------------------------------+ | LEAST (3,5,1,8, -, About, the, -, the, +)                        | +---------------------------------------------------------+ |1| +---------------------------------------------------------+1Rowinch Set(0.00Sec

Other more function references: http://developer.51cto.com/art/201401/426252_all.htm

The PostgreSQL function gets the numeric size value of multiple fields