随机选择行的SQL语句? ORACLE SQLSERVER ECT.
MySQL:
SELECT column from table
ORDER BY RAND()
LIMIT 1
PostgreSQL:
SELECT column from table
ORDER BY RANDOM()
LIMIT 1
Microsoft SQL Server:
SELECT TOP 1 column from table
ORDER BY NEWID()
IBM DB2
SELECT column, RAND() as IDX
from table
ORDER BY IDX FETCH FIRST 1 ROWS ONLY
Thanks Tim
Oracle:
SELECT column from
( SELECT column from table
ORDER BY dbms_random.value )
WHERE rownum = 1
Thanks Mark Murphy
Feel free to post other example, variations, and SQL statements for other database servers in the comments.
相关文档：
【案例一】
题目：
--触发器：
--添加员工信息,流水号作为自动编号(通过序列生成),
--并且判断如果工资小于0,则改为0;如果大于10000,则改为10000。
CREATE TABLE emp2(
e_id NUMBER,
e_no NUMBER,
e_name VARCHAR2(20),
e_sal NUMBER
)
SELECT * from emp2;
CREATE SEQUENCE seq_trg_id;
INSERT INTO emp2(e_i ......
在Stand alone的环境中创建Oracle data source供测试使用：
OracleDataSource dataSource = new OracleDataSource();
dataSource.setDriverType("oracle.jdbc.driver.OracleDriver");
dataSource.setURL("jdbc:oracle:thin:@localhost:1521:ORCL");
......
Can you connect to an Oracle database with a 64-bit Oracle client?
Technote (FAQ)
Question
You are unable to connect to an Oracle database with a 64-bit Oracle client. Does Lotus Enterprise Integrator (LEI), Lotus Domino Enterprise Connection Services (DECS), or LSX ......
select sid,
p1,
p1raw,
p2,
p2raw,
p3,
p3raw,
&n ......
oracle 数据库的维护
快过年了，各家公司都要准备放假了，给自己的数据库做个体检吧，写个报告之类的，呵呵。
看了个别人写的 先拿来存着 有空自己编个。
载自oracle中文技术论坛。从整体上介绍了一个dba的职责和任务等等。
ORACLE数据库管理员应按如下方式对ORACLE数据库系统做定期监控� ......
