Oracle笔记

查询表结构:

select * from user_tab_columns where table_name = '大写表名';

查看表结构&字段注释

select
	a.column_name,
	b.comments,
	a.DATA_TYPE || '(' || A .DATA_LENGTH || ')' 类型
from
	user_tab_columns a,
	user_col_comments b
where
	a.table_name = '大写表名'
	and a.table_name = b.table_name
	and a.column_name = b.column_name

随机查询 N 条数据:

select * from (select * from [表名] order by sys_guid()) where rownum <= N;

递归查询:

select * from [表名] start with [条件] connect by [子级字段] = prior [父级字段];

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