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Can 'false' match some string in MySQL?
Yes, you can use false as 0 to match.
Let us first create a table −
mysql> create table DemoTable804 ( Id varchar(100) ); Query OK, 0 rows affected (0.66 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable804 values('101John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable804 values('Carol1002'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable804 values('1000'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable804 values('1010Bob'); Query OK, 1 row affected (0.10 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable804;
This will produce the following output -
+-----------+ | Id | +-----------+ | 101John | | Carol1002 | | 1000 | | 1010Bob | +-----------+ 4 rows in set (0.00 sec)
Here is the query for false match. If a string is found at first, then it won’t convert and 0 would be visible. The same occurred in row 2 as shown below −
mysql> select 0+Id from DemoTable804;
This will produce the following output -
+------+ | 0+Id | +------+ | 101 | | 0 | | 1000 | | 1010 | +------+ 4 rows in set, 2 warnings (0.00 sec)
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