SQLSTATE 42000 Syntax error or access violation

SQLSTATE 42000 Syntax error or access violation
Illuminate\Database\QueryException

SQLSTATE[42000]: Syntax error or access violation: 1427 For float(M,D), double(M,D) or decimal(M,D), M must be D column rating (Connection: mysql, SQL create table product_rating id bigint unsigned not null auto_increment primary key, `product_id` bigint unsigned not null, `username` varchar(255) not null,

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What does M D mean in decimal(M D) exactly?,
Error 1427: For float(M D double(M D or decimal,
SQLSTATE[42000]: Syntax error or access violation: 1064,
SQLSTATE[42000]: Syntax error or access violation,
SQLSTATE42000 syntax error or access violation,