Oracle资料之sequence-优快云博客

本文链接：https://blog.youkuaiyun.com/sky6even/article/details/102541794

本文介绍了Oracle数据库中sequence的使用，包括如何获取sequence的下一个值以及详细解析了sequence的相关视图，帮助读者理解sequence视图的含义和字段信息。

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◆ 获取sequence下一个值

select sequence.nextval from dual;

◆ sequence视图：

ALL_SEQUENCES

视图含义：

ALL_SEQUENCES describes all sequences accessible to the current user.

相关视图：

1、DBA_SEQUENCES describes all sequences in the database.

2、USER_SEQUENCES describes all sequences owned by the current user. This view does not display the SEQUENCE_OWNER column.

字段信息：

Column	Datatype	NULL	Description
SEQUENCE_OWNER	VARCHAR2(30)	NOT NULL	Name of the owner of the sequence
SEQUENCE_NAME	VARCHAR2(30)	NOT NULL	Sequence name
MIN_VALUE	NUMBER		Minimum value of the sequence
MAX_VALUE	NUMBER		Maximum value of the sequence
INCREMENT_BY	NUMBER	NOT NULL	Value by which sequence is incremented
CYCLE_FLAG	VARCHAR2(1)		Does sequence wrap around on reaching limit
ORDER_FLAG	VARCHAR2(1)		Are sequence numbers generated in order
CACHE_SIZE	NUMBER	NOT NULL	Number of sequence numbers to cache
LAST_NUMBER	NUMBER	NOT NULL	Last sequence number written to disk. If a sequence uses caching, the number written to disk is the last number placed in the sequence cache. This number is likely to be greater than the last sequence number that was used.