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Which datatype should I use for flag in MySQL?
To set a flag, you can set the type as tinyint(1) type.
Following is the syntax −
yourColumnName tinyint(1) DEFAULT 1;
Let us first create a table −
mysql> create table DemoTable ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(20), isMarried tinyint(1) DEFAULT 1 ); Query OK, 0 rows affected (0.64 sec)
Insert some records in the table using insert command −
mysql> INSERT INTO DemoTable(ClientName,isMarried) values('Larry',0);
Query OK, 1 row affected (0.16 sec)
mysql> INSERT INTO DemoTable(ClientName) values('David');
Query OK, 1 row affected (0.12 sec)
mysql> INSERT INTO DemoTable(ClientName,isMarried) values('Mike',1);
Query OK, 1 row affected (0.19 sec)
mysql> INSERT INTO DemoTable(ClientName) values('Carol');
Query OK, 1 row affected (0.14 sec)Following is the query to display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output that displays one of the column, which is set as flag −
+----------+------------+-----------+ | ClientId | ClientName | isMarried | +----------+------------+-----------+ | 1 | Larry | 0 | | 2 | David | 1 | | 3 | Mike | 1 | | 4 | Carol | 1 | +----------+------------+-----------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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