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)

Kumar Varma

Published on 09-Jul-2019 12:06:18