What is the value of the null and non-null settings when MySQL creates a table?

What is the value of the null and non-null settings when MySQL creates a table?

Reply to discussion (solution)

Did anyone answer????

I generally try not to use null

If your 0 and null or ' and null have different meanings, then you need to allow empty

It depends on your business needs.
Null null means nothing is entered, that is, the data item is invalid

If your business requires data items to have an initial value, then you should use NOT null (not empty) and set the initial value

The above is the empty value and non-null value setting when MySQL creates the table what is the focus of the content, more relevant content please pay attention to topic.alibabacloud.com (www.php.cn)!

