MySQL query with OR & AND conditions

Let us first create a table −

mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Name varchar(20),    -> Age int    -> ); Query OK, 0 rows affected (0.63 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(Name,Age) values('John',21); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Name,Age) values(Null,20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Name,Age) values('David',23); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Name,Age) values('Carol',null); Query OK, 1 row affected (0.17 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

+----+-------+------+ | Id | Name  | Age  | +----+-------+------+ | 1  | John  | 21   | | 2  | NULL  | 20   | | 3  | David | 23 | | 4  | Carol | NULL | +----+-------+------+ 4 rows in set (0.00 sec)

Following is the query with OR & AND conditions −

mysql> select *from DemoTable -> where Name='David' OR (Name is null AND Age=20);

Output

+----+-------+------+ | Id | Name | Age | +----+-------+------+ | 2 | NULL | 20 | | 3 | David | 23 | +----+-------+------+ 2 rows in set (0.00 sec)