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)
Published on 17-May-2019 16:14:00
