optimize create table sql in examples

[superalsrk]

Some times in sqlite, the field may be just an integer.

if we use sql like

create table foo (id integer not null primary key, name text, 1 float);

it runs wrong, so a better solution is to use sql like

create table foo ([id] integer not null primary key, [name] text, [1] float);

[coveralls]

Coverage remained the same at 84.01% when pulling ef218ac on LeiFung:master into 25d045f on mattn:master.

[mattn]

I don't use this syntax without it need to do. Sorry.