mysql - INSERT auto_increment value -

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i have simple table few values , primary key auto_incremented 1:

create table test1 (acounter int not null primary key, studentid int not null,  ranking int not null, aweek date not null);  alter table test1 auto_increment=1;

if able insert test1 (null,1012,1,'2015-04-20'), data comes in different order tried insert test1 (acounter,aweek,ranking,studentid) values (null,'2015-04-20',1,1012) - receive error primary key cannot null. don't want - expect auto_increment use next value.

when declared column auto increment ,db take of insert other values table.

insert test1 (aweek,ranking,studentid) values  ('2015-04-20',1,1012)

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