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What is “SELECT TRUE” in MySQL?
The statement SELECT TRUE returns 1 if a row match. Let us first create a table −
mysql> create table DemoTable(Name varchar(100)); Query OK, 0 rows affected (0.54 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('Chris');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('Robert');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('David');
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 −
+--------+ | Name | +--------+ | Chris | | Robert | | David | +--------+ 3 rows in set (0.00 sec)
Following is the query for SELECT TRUE −
mysql> select true from DemoTable;
This will produce the following output −
+------+ | TRUE | +------+ | 1 | | 1 | | 1 | +------+ 3 rows in set (0.00 sec)
Updated on: 03-Sep-2019
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