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最新评论
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lgh1992314:
[u][i][b][flash=200,200][url][i ...
看看mybatis 源代码 -
尼古拉斯.fwp:
图片根本就不出来好吧。。。。。。
Android文件图片上传的详细讲解(一)HTTP multipart/form-data 上传报文格式实现手机端上传 -
ln94223:
第一个应该用排它网关吧 怎么是并行网关, 并行网关是所有exe ...
工作流Activiti的学习总结(八)Activiti自动执行的应用 -
ZY199266:
获取不到任何消息信息,请问这是什么原因呢?
ActiveMQ 通过JMX监控Connection,Queue,Topic的信息 -
xiaoyao霄:
DestinationSourceMonitor 报错 应该导 ...
ActiveMQ 通过JMX监控Connection,Queue,Topic的信息
第五章不同时区管理数据 TIME_ZONE 会话参数值 时间相对值: ALTER SESSION SET TIME_ZONE = '-05:00'; 数据库时间区: ALTER SESSION SET TIME_ZONE = dbtimezone; 操作系统时间区: ALTER SESSION SET TIME_ZONE = local; 区域命名: ALTER SESSION SET TIME_ZONE = 'America/New_York'; CURRENT_DATE: 设置时间的格式: ALTER SESSION SET NLS_DATE_FORMAT='DD-MON-YYYY HH24:MI:SS'; 设置时区 ALTER SESSION SET TIMZE_ZONE='-5:00'; SELECT SESSIONTIMEZONE,CURRENT_DATE FROM DUAL; CURRENT_TIMESTAMP: SELECT SESSIONTIMEZONE,CURRENT_TIMESTAMP FROM DUAL; LOCALTIMESTAMP: SELECT CURRENT_TIMESTAMP,LOCALTIMESTAMP FROMDUAL; DBTIMEZONE SELECT DBTIMEZONE FROM DUAL; SESSIONTIMEZONE SELECT SESSIONTIMEZONE FROM DUAL; 获取部分时间的值: select extract(YEAR FROM SYSDATE) FROM DUAL; SELECT last_name, hire_date, EXTRACT (MONTH FROM HIRE_DATE) FROM employees WHERE manager_id = 100; TZ_OFFSET select TZ_OFFSET('US/Eastern') from dual; select TZ_OFFSET('Europe/London') from dual; FROM_TZ select FROM_TZ(TIMESTAMP '2000-03-28 08:00:00','3:00') from dual; select FROM_TZ(TIMESTAMP '2000-03-28 08:00:00','Australia/North') from dual; TO_TIMESTAMP SELECT TO_TIMESTAMP ('2000-12-01 11:00:00','YYYY-MM-DD HH:MI:SS') FROM DUAL; TO_TIMESTAMP_TZ SELECT TO_TIMESTAMP_TZ('1999-12-01 11:00:00 -8:00','YYYY-MM-DD HH:MI:SS TZH:TZM') FROM DUAL; SELECT hire_date, hire_date + TO_YMINTERVAL('01-02') AS HIRE_DATE_YMININTERVAL FROM employees WHERE department_id = 20; SELECT last_name, TO_CHAR(hire_date, 'mm-dd-yy:hh:mi:ss') hire_date, TO_CHAR(hire_date + TO_DSINTERVAL('100 10:00:00'), 'mm-dd-yy:hh:mi:ss') hiredate2 FROM employees; 第六章子查询 SELECT employee_id, manager_id, department_id FROM employees WHERE (manager_id, department_id) IN (SELECT manager_id, department_id FROM employees WHERE employee_id IN (199,174)) AND employee_id NOT IN (199,174); SELECT employee_id, last_name, (CASE WHEN department_id = (SELECT department_id FROM departments WHERE location_id = 1800 )THEN 'Canada' ELSE 'USA' END ) location FROM employees; SELECT employee_id, last_name FROM employees e ORDER BY (SELECT department_name FROM departments d WHERE e.department_id = d.department_id); SELECT last_name, salary, department_id FROM employees outer WHERE salary > (SELECT AVG(salary) FROM employees WHERE department_id = outer.department_id); SELECT e.employee_id, last_name,e.job_id FROM employees e WHERE 2 <= (SELECT COUNT(*) FROM job_history WHERE employee_id = e.employee_id); SELECT employee_id, last_name, job_id, department_id FROM employees outer WHERE EXISTS ( SELECT 'X' FROM employees WHERE manager_id = outer.employee_id); SELECT department_id, department_name FROM departments d WHERE NOT EXISTS (SELECT 'X' FROM employees WHERE department_id = d.department_id); UPDATE table1 alias1 SET column = (SELECT expression FROM table2 alias2 WHERE alias1.column = alias2.column); DELETE FROM table1 alias1 WHERE column operator (SELECT expression FROM table2 alias2 WHERE alias1.column = alias2.column); with的语句的使用: WITH dept_costs AS ( SELECT d.department_name, SUM(e.salary) AS dept_total FROM employees e, departments d WHERE e.department_id = d.department_id GROUP BY d.department_name), avg_cost AS ( SELECT SUM(dept_total)/COUNT(*) AS dept_avg FROM dept_costs) SELECT * FROM dept_costs WHERE dept_total > (SELECT dept_avg FROM avg_cost) ORDER BY department_name;
发表评论
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各种数据库分页Dialect的方法
2011-12-02 09:01 1967以下分页技术均来自hibernate-core-3.3.1.G ... -
Oracle控制文件管理
2011-10-18 17:00 2059每一个Oracle数据库都有一个二进制文件记录着数据库的物理结 ... -
Oracle 问题诊断工具ADRCI(ADRCI: ADR Command Interpreter)
2011-10-29 09:23 2063ADRCI is a command-line tool th ... -
Oracle正则表达式函数:regexp_like、regexp_substr、regexp_instr、regexp_replace
2011-10-17 17:07 8539Oracle使用正则表达式离 ... -
Oracle 10g SQL Fundamentals II(学习笔记二第7-8章)
2011-10-17 16:27 1841第七章分层检索 语法: SELECT [LE ... -
Oracle 10g SQL Fundamentals II(学习笔记二第3-4章)
2011-10-17 16:25 1646第三章 大数据集合 从一个表中拷贝数据 ... -
Oracle 10g SQL Fundamentals II(学习笔记二第1-2章)
2011-10-17 16:23 1879第一章用户访问 创建用户 create user us ... -
Oracle 10g SQL Fundamentals I(学习笔记二第10-11章)
2011-10-16 11:19 1587第十章创建其他对象(视图,索引,序列,同义词) 视图的优点 ... -
Oracle 10g SQL Fundamentals I(学习笔记二第7-8章)
2011-10-16 11:17 1130第七章使用各种操作Union/UNION ALL/MINUS/ ... -
ORACLE CTAS(create table as select)使用注意点
2011-10-09 11:28 6344ORACLE CTAS(create table as sel ... -
Oracle的小应用
2011-10-08 16:38 869今天同事打电话让我把数据库中的一个用户下所有表的注释导出 ... -
Oracle 10g SQL Fundamentals I(学习笔记二第4-6章)
2011-10-08 16:28 1506第四节: 分组函数: select [column, ... -
Oracle 10g SQL Fundamentals I(学习笔记第1-3章)
2011-10-08 16:25 1682第一章和第二章 distinct like 'S%' ... -
Oracle监控语句
2011-09-21 22:40 8311.监控事例的等待 select event,sum(de ... -
Oracle Rman 命令详解(List report backup configure)
2011-09-21 22:37 1503一、list常用命令总结备忘 list命令列出控制文件、 ... -
Oracle RMAN相关验证备份
2011-09-20 23:19 2155一.备份db并查看备份 list backup summ ... -
Oracle 的 Alert 日志
2011-09-20 23:18 2845从 Oracle 11g 开始,Oracle 数据库以XML与 ... -
Oracle 几个常用命令
2011-09-19 19:35 1259OEMC启动dbconsole进程1. emctl star ... -
Oracle中登录文件Login的定制
2011-09-14 10:55 1811在window系统针对Oracle登录调试设置登录 ... -
ORACLE使用dbv工具检验数据文件是否有坏块
2011-09-13 22:31 2723使用dbv工具检验数据文件是否有坏块 dbv工具可以用来验 ...
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