How do you set a field to allow null values in DB2?
In DB2, you can use the following syntax to set a field to allow null values:
ALTER TABLE 表名 ALTER COLUMN 列名 SET NULL
For example, to set the field “column_name” in the table to allow null values, you can execute the following command:
ALTER TABLE table_name ALTER COLUMN column_name SET NULL
Please make sure to replace “table_name” with the actual table name and “column_name” with the actual column name in the command above.