我正在尝试清理一个数据库表,我真的很想删除两列,因为它们不应该再被使用。- Unable to modify table.ALTERTABLE DROP COLUMN AveragePriceMta failed because one or more objects access this column.我查看了这个表的索引,在一个灰色的"Included columns“字段中找到了我想要删除的特定列。显然,我不想只
我试图在Oracle 9中的列中添加“null”约束。ALTERTABLE user_roles modify group_id varchar2(36 char) set not null;Error reportTABLE operations.*Action: Ensure that drop column is the sole operation specified in
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