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The test found that even in 11.2, the problem still existed: Sql> SELECT * from V$version; BANNER -------------------------------------------------------------------------------- Oracle database11genterprise Edition release11.2.0.1.0-64bit Production Pl/sql Release 11.2.0.1.0-production CORE 11.2.0.1.0 Production TNS for Linux:version 11.2.0.1.0-production Nlsrtl Version 11.2.0.1.0-production sql> CREATE TABLE T1 2 (ID number, 3 NAME VARCHA

Oracle Database--sql Advanced QueryI. Related content1. Master the multi-table connection query for the SELECT statement.2. Master the subquery of the SELECT statement.Second, the specific operation(a) According to the EMP table and the Dept table under the Scott scheme of the Oracle database, do the following:1. Check the names of all employees who work for clerk and their department name.Select Ename,dname from scott.emp t1 inner joins scott.dept T

Communication between threads in Java multithreading, java Multithreading1. Use the while method to implement inter-thread Communication Package com. ietree. multithread. sync; import java. util. arrayList; import java. util. list; public class MyList {private volatile static List list = new ArrayList (); public void add () {list. add ("apple");} public int size () {return list. size () ;}public static void main (String [] args) {final MyList list1 = new MyList (); Thread

Kf=read.csv (' D:/kf.csv ') # Read recovery dataKfSl=as.matrix (Kf[,1:3]) #生成生理指标矩阵Xl=as.matrix (Kf[,4:6]) #生成训练指标矩阵X=slXY=xlYX0=scale (x)X0Y0=scale (y)Y0M=t (x0)%*%y0%*%t (y0)%*%x0MEigen (M)W1=eigen (m) $vectors [, 1]V1=t (y0)%*%x0%*%w1/sqrt (As.matrix (Eigen (m) $values) [1,])V1T1=X0%*%W1 #第一对潜变量得分向量T1 # above for the first step (1) to extract the first pair of two variables group, and make it the most relevant.U1=y0%*%v1U1 #第一对潜变量得分向量Library ("PRAC

1. Sleep () Introduction Sleep () is defined in Thread.java. The function of sleep () is to let the current thread hibernate, that is, the current thread will go from "Run state" to "hibernate (blocked) state". Sleep () Specifies the time of hibernation, when the thread sleeps longer than/equal to the sleep time; When the thread is awakened, it becomes "ready" by the blocking state, which waits for the CPU's dispatch to execute. 2. Sleep () example The following is a simple example to illust

are three columns, each containing several columns. For example, the column-family1 family contains two columns named column1 and column2, T1: ABC, T2: gdxdf is a cell uniquely identified by row key1 and the column-family1-column1. The cell contains two data types: ABC and gdxdf. The timestamps of the two values are different, T1, T2, and hbase returns the value of the latest time to the requester. The spe

))Blob:binary Large ObjectClob:character Large OBJCT#创建数据库Create DATABASE MyDB;#删除数据库Drop database mydb;#查看所有的数据库show databases;#更改当前的数据库Use MyDB;#查看创建数据库的sql语句Show CREATE Database mydb;#创建表CREATE TABLE T1(ID int,Name varchar (20),Age int);#查询表的所有数据SELECT * from T1;#删除表drop table T1;#查看创建表的sql语句Show CREATE table T1;#查看

Setbalance (long balance) {this.balance = balance; @Override public String toString () {return "account [id=" + ID + ", balance=" + Balance + "]"; } } Package com.cdai.orm.hibernate.transaction; Import org.hibernate.Session; Import Org.hibernate.SessionFactory; Import org.hibernate.Transaction; Import org.hibernate.cfg.AnnotationConfiguration; Import Com.cdai.orm.hibernate.annotation.Account; public class Dirtyread {public static void main (string[] args) {final se

This chapter covers the following topics:1. Yield () Introduction2. Yield () example3. Comparison of yield () and wait () 1. Yield () IntroductionThe role of yield () is to give in. It allows the current thread to move from "Run state" to "ready state", this allows other waiting threads with the same priority to get execution rights, but there is no guarantee that after the current thread calls yield (), other threads with the same priority will be able to execute; it may also be that the curre

transaction (T1) are read by other transactions (T2) without being committed, and T1 does rollback operations, the data that the T2 just read does not actually exist.non-repeatable read , T1 read data item, T2 the data in it was modified or deleted and commit succeeded. If T1 attempts to read the data again, it will g

. Let's take an example of a 10053 event: SQL> create table t1 as select rownum rn from dba_objects;Table created.SQL> create index ind_t1 on t1 (rn );Index created.SQL> exec dbms_stats.gather_table_stats (user, 't1', cascade => true );PL/SQL procedure successfully completed.SQL> create table t2 as select rn, 't2' name from t