SQLPlus的使用技巧。用SQL Plus看执行计划和统计信息：set autotrace trace exp；
显示结果集的行宽：show linesize；//默认为80
设置结果集的行宽：set linesize 200；
显示结果集的每页记录数：show pagesize；//默认为15
设置结果集的每页记录数：set pagesize 50；
让SQL Plus允许复制粘贴，点击窗口属性勾选选项的快速编辑模式与插入模式，如下图：
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