Specified key was too long; max key length is 767 bytes

database: MySQL 6

operation: 建表

sqlcode:

drop table if exists Atable ;
create table Atable (
id varchar(192) not null primary key,
name varchar(20) not null
)
error: Specified key was too long; max key length is 767 bytes

cause: UTF-8 requires up to 4 bytes per character in MySQL6.

test:

"

drop table if exists Atable ;

create table Atable (

id varchar(191) not null primary key,

name varchar(20) not null

)

" is ok