SQL: how to alter column size

What SQL sta开发者_开发知识库tement will resize a column in an Access MDB database?

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ALTER TABLE tablename ALTER columnname is the command you want. Syntax may vary depending on your database system.

Edit: Ah Access. In that case, see http://msdn.microsoft.com/en-us/library/bb177883(v=office.12).aspx

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Example for MySQL on how to change size of a column named baz in table bar in database foo to 20 characters.

ALTER TABLE `foo`.`bar` MODIFY COLUMN `baz` VARCHAR(20)

Check the SQL manual for the exact syntax for your database.

MySQL ALTER manual

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Edit: This is for MS ACCESS 2007:

ALTER TABLE Employees ALTER COLUMN Salary CHAR(20);

Got this example from Microsoft