ORA-12987: cannot combine drop column with other operations

文档解释

ORA-12987: cannot combine drop column with other operations

Cause: An attempt was made to combine drop column with other ALTER TABLE operations.

Action: Ensure that drop column is the sole operation specified in ALTER TABLE.

ORA-12987:不能与其他操作组合使用DROP COLUMN。

官方解释

常见案例

ALTER TABLE customer ADD a VARCHAR2(20) NOT NULL, DROP COLUMN b;

正常处理方法及步骤

ALTER TABLE customer DROP COLUMN b, ADD a VARCHAR2(20) NOT NULL;