问题描述 最近搜索关键词,去除重复 解决方案 1 2 3 4 5 6 7 8 9 10 11 12 -- 使用rowid标识解决重复问题 DELETE FROM your_table WHERE rowid not in (SELECT MIN(rowid) FROM your_table GROUP BY column1, column2, column3); -- method1 DELETE from table_name where rowid not in (select min(rowid) FROM table_name group by column_name);……
新手与专家思维区别 》》从总体出发 Stage 1: Novice 特点 Novices don’t particularly want to learn; they just want to accomplish an immediate goal. They do not know how to respond to mistakes and so are fairly vulnerable to confusion when things go awry. Stage 2: Improved Beginner Stage 3: Competent Stage 4: Proficient Stage 5: Expert Software isn’t designed in……
使用Thumbnails包对图片添加水印效果 Thumbnails are ideally implemented on web pages as separate, smaller copies of the original image, in part because one purpose of a thumbnail image on a web page is to reduce bandwidth and download time. 。。。 Thumbnail@wiki 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19……
问题描述 1 2 oracle id in(a,b,c) 语句如果选项长度超过了1000会引起jdbc异常,错误如下 1 ERROR [net.sf.hibernate.util.JDBCExceptionReporter:58] ORA-01795: maximum number of expressions in a list is 1000 解决方法 将获取id数组的地方用java平均拆分成小于100……