358
358
create table t1 (a int not null primary key, b varchar(20) not null unique);
364
364
create table t1 (a int not null primary key, b int not null unique);
370
370
create table t1 (a int not null primary key, b varchar(20) not null, unique (b(10)));
376
376
create table t1 (a int not null primary key, b varchar(20) not null, c varchar(20) not null, unique(b(10),c(10)));