小编use*_*669的帖子

I am using mysql 5.5.16

What is the difference between the following DDL statements?

1)
create table sql_query (
    id int not null
    , query_text varchar(21826) not null
    , query_md5 binary(16) not null
    , primary key (id)
    , unique index query_md5_index (query_md5)
) engine=InnoDB;

2) 
create table sql_query (
    id int not null
    , query_text varchar(21826) not null
    , query_md5 binary(16) not null
    , primary key (id)
    , unique query_md5_index (query_md5)
) engine=InnoDB;

3)
create table sql_query (
    id int …