To update the column size, you can use the alter command. The syntax is as follows -
alter table yourTableName change yourColumnName yourColumnName data type;
To understand the above syntax, let us create a table. Query to create table -
mysql> create table DataTruncated −> ( −> id int, −> Name varchar(5) −> ); Query OK, 0 rows affected (0.64 sec)
Look at the "Name" column above, the column size is 5. Whenever we give a size greater than 5, MySQL gives the following error -
mysql> insert into DataTruncated values(101,'JohnSmith'); ERROR 1406 (22001): Data too long for column 'Name' at row 1
Now update the column size of the "name" column. The query is as follows -
mysql> alter table DataTruncated change Name Name varchar(200); Query OK, 0 rows affected (2.01 sec) Records: 0 Duplicates: 0 Warnings: 0
Insert the same records into the table. Now, since we updated the column size from 5 to 25, there are no visible errors -
mysql> insert into DataTruncated values(101,'JohnSmith'); Query OK, 1 row affected (0.11 sec)
Display records -
mysql> select *from DataTruncated;
Below is the output -
+------+-----------+ | id | Name | +------+-----------+ | 101 | JohnSmith | +------+-----------+ 1 row in set (0.00 sec)
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