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jane19860614
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ORA-1555: snapshot too old (rollback segment too small)
The usual cause of this error is that long-running transactions/queries are occurring within the database at the same time as short online原创 2011-08-08 13:15:49 · 873 阅读 · 0 评论 -
SQL UNIQUE约束
1. 创建：create table table_name( col1_name int not null unique, col2_name varchar2(10), ... coln_name varchar2(10)); cr原创 2011-08-22 09:13:08 · 314 阅读 · 0 评论