- 更多网络例句与冗语句相关的网络例句 [注：此内容来源于网络，仅供参考]
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The optimization methods of database SQL query were studied and some available query optimization Methods were given out as follows: The incompatible data type should avoid to be used; More redundancy search parameters should be given as join condition in join query; In some condition, the number of note hitted to target was estimated by optimizing implement using the average density; Some other maths operating symbol should avoid to be used as condition parameters in WHERE clause; Some operating symbol and its sentence should avoid to be used also; When the cluster function was used,the WHERE clause should be paied attention to more,and so on.
作者单位：（重庆工学院商贸信息学院，重庆 400050）摘要：数据库SQL查询语句的优化，须注意：避免使用不兼容数据类型；连接查询中应多给连接条件提供一些冗余的搜索参数；某种条件下优化器只能使用其平均密度以估计命中的记录数；避免对WHERE子句中条件参数使用其它数学操作符；避免使用某些操作符及相应语句；聚簇函数的使用应注意WHERE子句。
- 更多网络解释与冗语句相关的网络解释 [注：此内容来源于网络，仅供参考]
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pleonastic：冗言的, 重复的 (形)
pleonasm 冗语句; 重复字 (名) | pleonastic 冗言的, 重复的 (形) | plessor 敲诊槌; 叩诊槌 (名)