I want to create a table in MySQL with a boolean
column whose default value is false
. But it\'s accepting NULL as default...
If you are making the boolean column as not null then the default 'default' value is false; you don't have to explicitly specify it.
You have to specify 0
(meaning false) or 1
(meaning true) as the default. Here is an example:
create table mytable (
mybool boolean not null default 0
);
FYI: boolean
is an alias for tinyint(1)
.
Here is the proof:
mysql> create table mytable (
-> mybool boolean not null default 0
-> );
Query OK, 0 rows affected (0.35 sec)
mysql> insert into mytable () values ();
Query OK, 1 row affected (0.00 sec)
mysql> select * from mytable;
+--------+
| mybool |
+--------+
| 0 |
+--------+
1 row in set (0.00 sec)
FYI: My test was done on the following version of MySQL:
mysql> select version();
+----------------+
| version() |
+----------------+
| 5.0.18-max-log |
+----------------+
1 row in set (0.00 sec)
Use ENUM in MySQL for true / false it gives and accepts the true / false values without any extra code.
ALTER TABLE `itemcategory` ADD `aaa` ENUM('false', 'true') NOT NULL DEFAULT 'false'
You can set a default value at creation time like:
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int,
Married boolean DEFAULT false);