Oracle

CREATE TABLE T (student_id number,course VARCHAR2 (Ten), score number);INSERT into t values (1, ' language ', 80);INSERT into t values (1, ' math ', 85);INSERT into t values (2, ' language ', 90);INSERT into t values (2, ' math ', 88);INSERT into t

1. Insert ' soft ' ' Guangzhou '); ' software test '); where deptno = 20; 2. Delete where deptno = 20; Delete from dept; 3. Modification ' ^.^ ' where deptno = 20; 4. Business Each modified statement can

--Query the foreign key for all tables of the user, owner condition is userSELECT * from user_constraints c where c.constraint_type = ' R ' and C.owner = ' A ';--delete foreign keys for all tables of the user, owner condition is userSelect ' ALTER

Preface: Only follow the master introduction, can take less detours, English documents is the most authoritative learning materials.(1), find the official online documentation for Oracle databaseThe following are the official online documentation

Oracle archive logs are typically generated by DML statements, so increasing too quickly should be DML too frequentlyStart by querying the following daily archives:Select TRUNC (first_time) "Time",SUM (Block_size * BLOCKS)/1024/1024/1024 "SIZE

Experiment two: Data manipulationExperimental Hours:4 hoursExperiment Type: Comprehensive typeExperimental requirements: CompulsoryFirst, the purpose of the experiment1, master SQL data query statement;2, master the use of SQL aggregation function;3,

Oracle Kanji Pinyin (get full spell/pinyin initials/Pinyin intercept, etc.) the effect is as follows: Oracle Character set GBK no problem, UTF-8 need to modify SQL code--oracle kanji to Pinyin package--1. Get full spell SELECT gethzpy.  Gethzfullpy (

I am the new Oracle, and that I need to learn more about it. But as your know, here are the company, isn't the school, you just stady by yourself, and no one can help you a lots.So, for the work, I need to learn how to backup our databases.Do it

Be asked a question on one sideAnd I wrote a SQL without thinking.The query results are correct for this topic, but the thought that there might be a parentid top clicknum is the same as another parentid non-top clicknum so that the query results

Data export: 1 full export of database test, user Name System Password Manager exported to D:\daochu.dmp exp System/[email protected] file=d:\daochu.dmp full=y data import   1 Import the data from the D:\DAOCHU.DMP into the test database.   Imp

After Oracle is installed, there is a default database in which we can create our own database, in addition to the default database.For beginners, to avoid trouble, you can create a database with the ' Database Configuration Assistant ' Wizard.After

I. Oracle pfile/spfile differencesPfileThe default name is "init+ routine name. Ora" file path: E:\oracle\product\10.2.0\db_1\dbs, which is a text file that can be opened with any text editing tool.SPFileThe default name is "spfile+ routine name.

As the company needs to install Oracle EBS for form development, it begins the painful process of Oracle EBS installation. In the beginning is installed in the VM Win2003 server EBS, I do not know whether my own level is too poor or bad luck,

Python link Oracle, to install Cx_oracleCode:#-*-coding=utf-8Import Cx_oracleImport MathComn=cx_oracle.connection (' System/[email protected]/orcl ')Cur=comn.cursor ()For I in range (1, 100):Cur.execute ("INSERT into BUSINESS_RECONCILIATION_TBL

CREATE TABLE Employees (EMPLOYEE_ID Number (6),Last_Name VARCHAR2 (+) not NULL,Email VARCHAR2 (25),Salary number (8,2),commission_pct number (2,2),Hire_date date not NULL,...DEPARTMENT_ID Number (4),CONSTRAINT emp_dept_fk FOREIGN KEY

First step: Open MyEclipse Database ExploreClick Window-open perspective-myeclipse Database Explore.Step Two: Create a new connectionStep Three: Configure the connectionFourth step: Load the drive and testFifth step: Test success, click Finish to

Query and delete duplicate records of SQL statement 1, find redundant records in the table, duplicate records are based on a single field (ID) to determine the select * from table where Id in (the Select ID from table group Byid having count (ID) > 1

Oracle foreign key constraint child table and parent table Create table employees (Employee_id NUMBER (6 ),Last_name VARCHAR2 (25) not null,Email VARCHAR2 (25 ),Salary NUMBER (8, 2 ),Commission_pct NUMBER (2, 2 ),Hire_date date not

Install the oracle client in linux 1. Prepare the required installation package. Oracle-instantclient-basic-10.2.0.5-1.i386.rpmOracle-instantclient-devel-10.2.0.5-1.i386.rpmOracle-instantclient-jdbc-10.2.0.5-1.i386.rpmOracle-instantclient-sqlplus-10.

SQLite 3.8.7 a large number of minor optimizations, improving performance by more than 50% News]SQLite 3.8.7alpha was released. This version contains hundreds of minor optimizations. Each of the minor optimizations will increase the performance