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Write a single MySQL query to return the ID from the corresponding row which is a NOT NULL value
Let us first create a table −
mysql> create table DemoTable ( StudentId int, StudentName varchar(100) ); Query OK, 0 rows affected (0.85 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(NULL,'Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(NULL,'Robert'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(101,'David'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(102,'Mike'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(103,'Sam'); Query OK, 1 row affected (0.18 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | NULL | Chris | | NULL | Robert | | 101 | David | | 102 | Mike | | 103 | Sam | +-----------+-------------+ 5 rows in set (0.00 sec)
Following is the query to return ID from the corresponding row which is a NOT NULL value −
mysql> select StudentId from DemoTable where StudentName='David' and StudentId IS NOT NULL;
This will produce the following output −
+-----------+ | StudentId | +-----------+ | 101 | +-----------+ 1 row in set (0.00 sec)
Updated on: 26-Sep-2019
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