decimal (and numeric) - what is
what is
decimal(p, s)
p ... precision (式の桁数)
p = 1 => 1 p = 2 => 10 p = 3 => 100
s ... scale (小数点以下の桁数)
s = 1 => 0.1 s = 2 => 0.01 s = 3 => 0.001
PostgreSQL: Documentation: 9.4: Data Types
diff (decimal and numeric)
(continue to survey)
PostgreSQL Data Types - NUMERIC and DECIMAL [Migration by Ispirer SQLWays]