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Why I am facing a problem using the field 'from' in SQL query?
You cannot use from as a column name directly because from is a reserved word in MySQL. To avoid this, you need to use backtick symbol. Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, `from` varchar(100), Name varchar(10) ); Query OK, 0 rows affected (0.92 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(`from`,Name) values('US','John');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(`from`,Name) values('UK','Carol');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(`from`,Name) values('AUS','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 −
+----+------+-------+ | Id | from | Name | +----+------+-------+ | 1 | US | John | | 2 | UK | Carol | | 3 | AUS | David | +----+------+-------+ 3 rows in set (0.00 sec)
Following is the query to use from reserved word as a column name −
mysql> select `from` from DemoTable;
This will produce the following output −
+------+ | from | +------+ | US | | UK | | AUS | +------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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