Sql: how to alter a type of a filed

Hi all,
Quick question, how can I change a type of a field with a sql statment.
I have my username set to varchar(50) and i want to expend it to (300);
thanks
peter

If you can do it in your database, it will likely be with SQL like:
ALTER TABLE table_name MODIFY username VARCHAR2(300)The syntax and limitations vary from database to database and version to version; in some versions of Oracle, you can increase the size of a VARCHAR2 but not decrease it. In MySQL, such an alteration is made by copying the entire table to a temporary table and back again, which is slow for large tables.
You should find a SQL reference for your database.
MySQL
http://dev.mysql.com/doc/mysql/en/alter-table.html
Oracle
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_3001.htm#sthref3982

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