set column to null mysql code example

Example 1: set column to not null mysql

ALTER TABLE Person MODIFY P_Id INT(11) NOT NULL;

Example 2: C# mysql update statement set value to null

cmd.Parameter.Add(New MySqlParameter("@nome", MySqlDbType.VarChar)).Value = DBNull.Value;

Example 3: mysql alter table column nullable

ALTER TABLE mytable MODIFY mycolumn VARCHAR(255);

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Sql Example

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