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SELECT b.comments as 注释,       a.column_name as 列名,       a.data_type || '(' || a.data_length || ')' as 数据类型,       a.nullable as 是否为空  FROM user_tab_columns a, user_col_comments b WHERE a.TABLE_NAME = '表名'   and b.table_name = '表名'   and a.column_name = b.column_name  
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