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ddlb , I would like to set the value of it to be null.

ddlb , I would like to set the value of it to be null.

ddlb , I would like to set the value of it to be null.

(OP)
Now I 'm writing the program from windows. For starting the value of ddlb, how can I set the original value be null or empty. Please tell me.

RE: ddlb , I would like to set the value of it to be null.

CODE

insert into tablename (field1, field2) values (1, NULL); 

or from php

CODE

$sql = "insert into tablename (field1, field2) values (1, NULL)";
mysql_query($sql); 

or from php in PDO

CODE

$s = $pdo->prepare('insert into tablename (field1, field2) values (?,?)');
$s->execute(array(1,NULL)); 

etc.

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