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Oracle----dual

时间:2014-10-29 18:33:39      阅读:210      评论:0      收藏:0      [点我收藏+]

1. dual is a table that contains a single row.

2. The dual table has one VARCHAR2 column named dummy.

3. dual contains a single row with the value X.

 

desc dual;

Name         Null?    Type
DUMMY                 VARCHAR2(1)

 

Oracle----dual

原文:http://www.cnblogs.com/daishuguang/p/4059964.html

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