MySQL always returning the bit values as blank? How to get the original values?

To get the original value, use the following syntax −

Syntax

select yourBitColumnName+0 from yourTableName;

The above syntax cast the bit column to an integer. To understand the above concept, let us create a table and check how the returning value is blank. We will also see how to get the original value.

The query to create a table.

mysql> create table BitDemo
-> (
-> hasValidId bit not null
-> );
Query OK, 0 rows affected (1.21 sec)

Insert some records in the table using insert command. The query to insert records is as follows −

mysql> insert into BitDemo values(1);
Query OK, 1 row affected (0.17 sec)

mysql> insert into BitDemo values(0);
Query OK, 1 row affected (0.32 sec)

Displaying value using a select statement. This returns a blank value −

mysql> select *from BitDemo;

The following is the output displaying blank value −

+------------+
| hasValidId |
+------------+
|            |
|            |
+------------+
2 rows in set (0.00 sec)

To get the original value for a bit column, use the following query −

mysql> select hasValidId+0 from BitDemo;

Output

+--------------+
| hasValidId+0 |
+--------------+
| 1            |
| 0            |
+--------------+
2 rows in set (0.00 sec)