Wrong value default ENUM Mysql type - php

Question

as i see every where even in here :
From the MySQL manual:
If an ENUM column is declared to permit NULL, the NULL value is a
legal value for the column, and the default value is NULL. If an ENUM
column is declared NOT NULL, its default value is the first element of
the list of permitted values.
But in my database is not like this !!!! Why ?
this is one of field structure :
`dead` enum('0','1') NOT NULL DEFAULT '0';
but why all data in the dead field is null ???
and if i chose that type to enter a value this will be list :
()Empty
(0)
(1)
Why always null is there ?
and another thing is when i use query like this :
UPDATE TABLE SET dead = 0 -> result : dead = null
UPDATE TABLE SET dead = 1 -> result : dead = 0
UPDATE TABLE SET dead = 2 -> result : dead = 1
Best Regards.

Answer 1

It is not clear what you are asking for.
Here is fiddle: http://sqlfiddle.com/#!9/8b24d0/1
As we can see when dead is not set in INSERT query:
insert into table1 (id) values (4);
mysql put there your default value '0' and that is what you were expecting I guess.
I don't know what version of mysql do you use, but in my fiddle it is clear that mysql doesn't allow to:
UPDATE table1 SET dead = 0;
Since it is enum, it only allows:
UPDATE table1 SET dead = '0';
And that is correct and expected behavior since you choose ENUM type for the column. So I can't reproduce described in OP behavior. If anybody else can?
GUESS I guess that you are trying to convert existing table column with existing data in that column and stuck. So to run alter table you should fix data first like:
UPDATE table1 SET dead='0' WHERE dead IS NULL;
So once you get data fixed you can try ALTER TABLE to set DEFAULT.