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最新评论
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zenmshuo:
如果使用SpreadJS这一类的表格工具,应该能更好的实现这些 ...
js中excel的用法 -
hjhj2991708:
第一个已经使用不了
jar包查询网站 非常好用! -
jiangmeiwei:
...
中文乱码 我的总结 不断更新 -
gary_bu:
...
response.sendRedirect 中文乱码问题解决 -
hnez:
多谢指点,怎么调试也不通,原来我在<body>&l ...
ExtJs IE ownerDocument.createRange() 错误解决方案
http://www.jlcomp.demon.co.uk/faq/duplicates.html
http://www.arikaplan.com/oracle/ari90897.html
http://www.arikaplan.com/oracle/ari90897.html
Identifying duplicate rows It is possible to determine duplicate rows using the select with a count of all the rows which have the same values in the 'unique' fields as follows : select a,b,count(*) from test group by a,b having count(*) > 1; The above script will produce an output something like the following : A B COUNT(*) ---------- ---------- ---------- 1 2 259 2 2 5 From this we can see that the so-called unique columns a and b in this table are nowhere near unique. We need to get rid of 258 and 4 rows respectively to make the table properly unique. See below for a couple of methods of how to do the deletions.
发表评论
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oracle删除重复记录
2009-07-16 11:16 1163有困难,找猪八戒 Q:要删除一张表中的重复记录,但是要保留一条 ... -
db2 express-c 安装后检查及安装例子数据库
2009-02-27 17:07 3358摘自http://publib.boulder.ibm.com ... -
问:如何得到与WEB-INF同级目录下的配置文件
2008-09-23 08:35 2095Q: 有如下需求:需要从WEB-INF同级的目录下读取配 ... -
讨论如何优化这条sql
2008-09-11 16:33 1573SELECT * FROM ( ... -
N Vs Exist in SQL
2008-07-02 16:39 1362N Vs Exist in SQL 原文如下: http:// ... -
SQL 指南
2008-05-27 11:45 1013http://www.sql-tutorial.com/ -
orace 分析函数
2008-05-26 09:08 1161select x.num, sum(x.num) over ( ... -
oralce tutoial 指南
2008-03-22 14:21 977http://www.exforsys.com/tutoria ... -
oracle 资源网站
2008-01-12 11:42 1840oracle alter table table_ ... -
Top 5 Oracle Reference Books 前5本 oracle 参考书
2008-01-12 11:24 1682http://databases.about.com/od/o ... -
Oracle与DB2、MySQL取前10条记录的对比<转>
2008-01-11 16:46 2194原文:http://tech.ccidnet.com/art/ ... -
expert on e on one oracle - Thomas Kyte 读书笔记
2008-01-11 10:17 2073=============================== ... -
oracle 资源 整体理解oralce 比较好 英文网
2008-01-09 16:59 1151http://www.adp-gmbh.ch/ora/admi ... -
oracle java 插入 clob insert clob hibernate
2007-12-21 15:48 7176用jdbc 或者 hibernate http://www.w ... -
pl/sql 应用之一
2007-12-12 17:21 1086declare begin insert into x ... -
init.ora文件所在目录
2007-12-12 15:58 2088Oracle安装盘:\oracle\admin\DB名称\pf ... -
[Oracle] 如何解决ORA-04031 错误
2007-12-12 15:53 3202[Oracle] 如何解决ORA-04031 ... -
oracle faq 常见问题解答 http://www.orafaq.com/
2007-12-12 13:34 1443The Oracle FAQ http://www.oraf ... -
oracle 快速参考
2007-12-12 09:58 1056http://www.psoug.org/library.ht ... -
oracle like
2007-12-12 09:18 3377http://www.adp-gmbh.ch/ora/sql/ ...
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