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MySQL query to fetch only a single field on the basis of boolean value in another field
Let us first create a table −
mysql> create table DemoTable ( EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName varchar(40), isMarried boolean ); Query OK, 0 rows affected (0.57 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(EmployeeName,isMarried) values('Chris',true);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(EmployeeName,isMarried) values('Robert',false);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(EmployeeName,isMarried) values('Mike',false);
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable(EmployeeName,isMarried) values('Bob',true);
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable(EmployeeName,isMarried) values('Tom',true);
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+------------+--------------+-----------+ | EmployeeId | EmployeeName | isMarried | +------------+--------------+-----------+ | 1 | Chris | 1 | | 2 | Robert | 0 | | 3 | Mike | 0 | | 4 | Bob | 1 | | 5 | Tom | 1 | +------------+--------------+-----------+ 5 rows in set (0.00 sec)
Following is the query to fetch only a single field on the basis of boolean value in another field −
mysql> select EmployeeName from DemoTable where isMarried=true;
This will produce the following output −
+--------------+ | EmployeeName | +--------------+ | Chris | | Bob | | Tom | +--------------+ 3 rows in set (0.00 sec)
Updated on: 03-Oct-2019
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