OERR: ORA-39726 unsupported add/drop column operation on compressed tables

Error:	  ORA-39726  (ORA-39726)
Text:	  unsupported add/drop column operation on compressed tables 
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Cause:	An unsupported add/drop column operation for compressed table was 
	attemped. 
Action:	When adding a column, do not specify a default value. DROP column 
	is only supported in the form of SET UNUSED column (meta-data drop 
	column).

错误：ora-39726（ora-39726）

正文：不支持添加/删除列操作压缩表

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原因：不支持添加/删除列操作压缩表

尝试。

行动：添加列时，不指定默认值。删除列

仅支持的形式设置未使用的列（元数据滴

列）。