Warning: #1265 Data truncated for column 'pdd' at row 1 [closed] - mysql

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I am having trouble trying to set the PDD(patient death date) to null on PHPMYADMIN until such death date comes; also on the client end then I can check for NULL data to use it.
Could anyone suggest me a solution, please ?
patientnhs_no hospital_no sex name surname dob address pls pdd
1001001001 6000001 m john smith 1941-01-01 Bournmouth 1 0000-00-00
(PDD should be null if is alive or death date if died)

Answer 1

As the message error says, you need to Increase the length of your column to fit the length of the data you are trying to insert (0000-00-00)
EDIT 1:
Following your comment, I run a test table:
mysql> create table testDate(id int(2) not null auto_increment, pdd date default null, primary key(id));
Query OK, 0 rows affected (0.20 sec)
Insertion:
mysql> insert into testDate values(1,'0000-00-00');
Query OK, 1 row affected (0.06 sec)
EDIT 2:
So, aparently you want to insert a NULL value to pdd field as your comment states ?
You can do that in 2 ways like this:
Method 1:
mysql> insert into testDate values(2,'');
Query OK, 1 row affected, 1 warning (0.06 sec)
Method 2:
mysql> insert into testDate values(3,NULL);
Query OK, 1 row affected (0.07 sec)
EDIT 3:
You failed to change the default value of pdd field. Here is the syntax how to do it (in my case, I set it to NULL in the start, now I will change it to NOT NULL)
mysql> alter table testDate modify pdd date not null;
Query OK, 3 rows affected, 1 warning (0.60 sec)
Records: 3 Duplicates: 0 Warnings: 1

Answer 2

You are most likely pushing a string 'NULL' to the table, rather then an actual NULL, but other things may be going on as well, an illustration:
mysql> CREATE TABLE date_test (pdd DATE NOT NULL);
Query OK, 0 rows affected (0.11 sec)
mysql> INSERT INTO date_test VALUES (NULL);
ERROR 1048 (23000): Column 'pdd' cannot be null
mysql> INSERT INTO date_test VALUES ('NULL');
Query OK, 1 row affected, 1 warning (0.05 sec)
mysql> show warnings;
+---------+------+------------------------------------------+
| Level | Code | Message |
+---------+------+------------------------------------------+
| Warning | 1265 | Data truncated for column 'pdd' at row 1 |
+---------+------+------------------------------------------+
1 row in set (0.00 sec)
mysql> SELECT * FROM date_test;
+------------+
| pdd |
+------------+
| 0000-00-00 |
+------------+
1 row in set (0.00 sec)
mysql> ALTER TABLE date_test MODIFY COLUMN pdd DATE NULL;
Query OK, 1 row affected (0.15 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql> INSERT INTO date_test VALUES (NULL);
Query OK, 1 row affected (0.06 sec)
mysql> SELECT * FROM date_test;
+------------+
| pdd |
+------------+
| 0000-00-00 |
| NULL |
+------------+
2 rows in set (0.00 sec)