Display only NOT NULL values from a column with NULL and NOT NULL records in MySQL
For this, you can use IS NOT NULL property. Let us first create a table −
mysql> create table DemoTable1
(
DueDate date
);
Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1 values('2019-09-10');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1 values(NULL);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1 values('2019-11-10');
Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1;
This will produce the following output −
+------------+
| DueDate |
+------------+
| 2019-09-10 |
| NULL |
| 2019-11-10 |
+------------+
3 rows in set (0.00 sec)
Here is the query to create second table −
mysql> create table DemoTable2
(
AdmissionDate date
);
Query OK, 0 rows affected (0.00 sec)
Here is the query to display only NOT NULL values −
mysql> insert into DemoTable2(AdmissionDate)
select DueDate from DemoTable1 where DueDate IS NOT NULL;
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0
Display all records from the table using select statement −
mysql> select * from DemoTable2;
This will produce the following output −
+---------------+
| AdmissionDate |
+---------------+
| 2019-09-10 |
| 2019-11-10 |
+---------------+
2 rows in set (0.00 sec)
Published on 24-Dec-2019 12:08:49
