您不能直接将 Db2 表中的列类型从 CLOB 更改为 BLOB！ALTER TABLE ALTER COLUMN SET DATA TYPE 语句只允许更改以下数据类型的列:特点数字二进制

you can't directly change the column type in your Db2 table from CLOB to BLOB!! The ALTER TABLE ALTER COLUMN SET DATA TYPE statement allows changing columns of the following data types only: Character Numeric Binary