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oracle 分页
oracle分页操作 sql select from emp; select from emp where rownum=3; 方式2 三层嵌套子循环 select from( select t. ,rownum rn from (select from em) t where rownum=3; ...
分类:数据库   时间:2019-08-15 19:06:06    阅读次数:137
线性代数知识荟萃(4)——矩阵相抵
Linear algebra is the branch of mathematics concerning vector spaces and linear mappings between such spaces. It includes the study of lines, planes, ... ...
分类:其他好文   时间:2019-08-15 05:57:11    阅读次数:91
JDBC 线程安全 数据库连接池
jdbc 是线程安全的,但是,推荐一个线程用一个链接 JDBC is thread safe: It is quite OK to pass the various JDBC objects between threads. For example, you can create the conne ...
分类:数据库   时间:2019-08-11 12:40:10    阅读次数:224
L440 人口老龄化
By 2050, the UN estimates that more than a third of the world’s population will be over 50, up from less than 16% in 1950. As a proportion of the work ...
分类:其他好文   时间:2019-08-10 10:03:30    阅读次数:69
.NET Standard
https://docs.microsoft.com/en-us/dotnet/standard/net-standard Choosing between .NET Core and .NET Framework for server apps:https://docs.microsoft.com ...
分类:Web程序   时间:2019-08-09 23:28:31    阅读次数:133
Spark SQL中出现 CROSS JOIN 问题解决
Spark SQL中出现 CROSS JOIN 问题解决 1、问题显示如下所示: Use the CROSS JOIN syntax to allow cartesian products between these relation 2、原因: Spark 2.x版本中默认不支持笛卡尔积操作 3、 ...
分类:数据库   时间:2019-08-09 13:22:49    阅读次数:307
进阶2:条件查询
and or not and or not &&和and:两个条件都为true,结果为true,反之为false ||或or: 只要有一个条件为true,结果为true,反之为false !或not: 如果连接的条件本身为false,结果为true,反之为false 三、模糊查询 like be... ...
分类:其他好文   时间:2019-08-08 00:41:19    阅读次数:160
maven循环引用的问题
多模块的maven工程,有时候由于设计的不合理或者需求的变更。会导致模块之间产生循环依赖,编译的时候会报如下的错误: [INFO] Scanning for projects... [ERROR] The projects in the reactor contain a cyclic refere ...
分类:其他好文   时间:2019-08-05 21:49:52    阅读次数:379
ZK安装、ZK配置、ZK集群部署
#间隔都是使用tickTime的倍数来表示的,例如initLimit=10就是tickTime的十倍等于2W毫秒 tickTime=2000 # The number of ticks that can pass between, sending a request and getting an a... ...
分类:其他好文   时间:2019-08-03 12:48:34    阅读次数:105
图论水题但是没想到
Note that this is the first problem of the two similar problems. You can hack this problem only if you solve both problems. You are given a tree with  ...
分类:其他好文   时间:2019-08-01 20:13:01    阅读次数:81
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