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Fetching records from a table with NULL and other values on the basis of conditions in MySQL
Let us first create a table −
mysql> create table DemoTable ( value1 int, value2 int, value3 int ); Query OK, 0 rows affected (0.70 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(20,40,null); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(40,40,null); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(null,null,null); Query OK, 1 row affected (0.17 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+--------+--------+--------+ | value1 | value2 | value3 | +--------+--------+--------+ | 20 | 40 | NULL | | 40 | 40 | NULL | | NULL | NULL | NULL | +--------+--------+--------+ 3 rows in set (0.00 sec
Here is the query to fetch records on the basis of NULL and other values on the basis of some condition −
mysql> select *from DemoTable where (value1 is null or value1!=20) and (value2 is null or value2!=20) and (value3 is null or value3!=20);
This will produce the following output −
+--------+--------+--------+ | value1 | value2 | value3 | +--------+--------+--------+ | 40 | 40 | NULL | | NULL | NULL | NULL | +--------+--------+--------+ 2 rows in set (0.00 sec)
Updated on: 30-Sep-2019
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