Oracle比较相似结构的两套表
出于某些原因，需要建立几十张表，使用DEL_开头，用于数据清理时记录所清理的数据。比如表TABLE1就对应DEL_TABLE1，但不幸的是，PDM文件与正式库表存在不一致，造成insert into DEL_TABLE1 select * from TABLE1未能正确插入，因此，有必要比较DEL_开头的表和对应表的差异。写程序太麻烦了，还是用SQL吧：
1、比较字段
select * from cols t where table_name like 'DEL%'and not exists (select 1 from cols t1 where t1.TABLE_NAME=substr(t.TABLE_NAME, 5) and t1.COLUMN_NAME=t.COLUMN_NAME and t1.DATA_TYPE=t.DATA_TYPE and t1.DATA_LENGTH=t.DATA_LENGTH and t1.COLUMN_ID=t.COLUMN_ID and t1.NULLABLE=t.NULLABLE) 2、检查是否有新字段
select * from cols twhere exists (select 1 from cols t2 where t2.table_name = 'DEL_'||t.table_name)and not exists (select 1 from cols t1 where t1.table_name = 'DEL_'||t.table_name and t1.COLUMN_NAME=t.COLUMN_NAME)
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