How to update column with null value

Question

I am using mysql and need to update a column with a null value. I have tried this many different ways and the best I have gotten is an empty string.

Is there a speci

Answer 1

Remember to look if your column can be null. You can do that using

mysql> desc my_table;

If your column cannot be null, when you set the value to null it will be the cast value to it.

Here a example

mysql> create table example ( age int not null, name varchar(100) not null );
mysql> insert into example values ( null, "without num" ), ( 2 , null );
mysql> select * from example;
+-----+-------------+
| age | name        |
+-----+-------------+
|   0 | without num |
|   2 |             |
+-----+-------------+
2 rows in set (0.00 sec)

mysql> select * from example where age is null or name is null;
Empty set (0.00 sec)