ALTER TABLE: Modify Database Table Properties

To modify the properties of a database table, you need to use SQL statements to execute the ALTER TABLE command. Here are some common operations for modifying properties.

1. Change the data type of the column.

ALTER TABLE table_name MODIFY column_name new_data_type;

1. Add a new column:

ALTER TABLE table_name ADD new_column_name data_type;

1. Delete column.

ALTER TABLE table_name DROP column_name;

1. Alter the constraints of a column (such as NOT NULL, DEFAULT, etc.):

ALTER TABLE table_name ALTER COLUMN column_name ADD constraint;

Please make sure to back up your data before making any changes to the table properties to prevent any unexpected situations.