Oracle

In the face of demand, we need to use Python to manipulate the Oracle database.This time we use cx_oracle.Oracle ClientBefore installing cx_oracle, install the Oracle client first.Cx_oracleCx_oracle is an extension module that follows the Python

TableCREATE TABLE Aa_test(AAAA NVARCHAR2 (20),BBBB number,CCCC NVARCHAR2 (20))Delete in two steps: first save to meet the requirements of theDelete from Aa_test t where (T.AAAA,T.BBBB) isn't in (Select T1.aaaa,max (T1.BBBB) from Aa_test T1 GROUP by

Experiment with the EMP table from the Scott user first.EMP table has a field, one is Empno (employee number), the other is MGR (higher manager number)Here is all the data in the table 1 select* from emp start with  empno=7698

Suppose there is a student table student, the student table has a name, a score, a course number, and now I need to sort the students ' grades according to the course.SELECT * FROM Student1. Rank over () can be achieved on the student rankings,

Http://blog.csdn.net/starnight_cbj/article/details/6792364Oracle establish tablespace and user. Category: Oracle 2011-09-20 08:58 80909 people read reviews (11 ) Collection report Oracletableuserfileinsertdeleteoracle establish tablespace and user

1> Creating a user for OracleCreate user username identified by PWS;2> Authorization to the userGrant Connect,resource to username;Grant Select on table or view name to username;Note: Use Select * from table or video map name in PLSQL; Hint table or

1. Flash BackAnnotation: Delete "t_spc_room" table, but no commit can be restored back with the following command.flashback table Mw_app. T_spc_room to before drop2. Handling special Charactersannotations : When inserting special with &, Oracle

--ascii Code and character conversionSelect Chr (65) | | Chr (66) | | Chr (ABC,CHR) (54678) from dual;Select ASCII (' 諙 '), ASCII (' ABC ') from Dual;--Get the string length functionSelect Length (' Abcde i Fghi ') from dual;--string

1 Linux Normal export/import1.1 Export under TerminalExp naricom/[email Protected]/sgtms owner= ' (' mw_app,mw_sys,statdba,dictdba ') ' file=/orabackup/sgtms_201408131200. DMP log=/orabackup/sgtms_201408131200.log buffer=800000001.2 End of ImportImp

Recent company projects to support the Oralce database, we migrated the project, the project using MyBatis need to manually modify the MyBatis SQL XML file, the modification process encountered a lot of problems, recorded here for easy follow-up

It's needless to say that you install centos6.0  first. Installation can be done. The only thing to note is that the checking the software requirements part of the Oracle 11G Installation Guide will require a subset of the software to be installed

oracle10g after installation, there are usually the following services:1.OracleCSServiceThe Oraclecsservice service manages the configuration of the cluster by controlling the members of the cluster nodes and notifying them when the node is joined

April 9, 2015 cold weatherTable Gw_log is designed as follows:Name Type NullableDefaultComments--------------------------------------------------ID VARCHAR2 ( -) Message ID service_id VARCHAR2 ( -) Y Service ID req_timeDATEY Request Time

12CORA-27106 error handling process Two days ago, the customer Exadata 12c Environment reported an error due to memory allocation. The following is the processing process. An error is reported when the node is restarted, but other nodes are started

Oracle practical tips 1. Flashback Note: delete the "T_SPC_ROOM" table, but you can use the following command to restore the table without commit.   flashback table MW_APP.T_SPC_ROOM to before drop2. Handling special characters   NOTE: If special

A small example of grouping and summation in oracle Cold weather in April 9, 2015Table gw_log is designed as follows: Name Type Nullable Default Comments ------------ ----------- -------- ------- ---------- ID VARCHAR2 (50) Message id SERVICE_ID

Dumpleafblock of Oracle Index Dump the Oracle index leaf block F: \ oracle \ product \ 10.2.0 \ db_1 \ BIN> sqlplus/as sysdbaSQL * Plus: Release 10.2.0.4.0-Production on Thu Apr 9 06:28:17 2015 Copyright (c) 1982,200 7, Oracle. all Rights Reserved.

Simple display of oracleclient bits 32bitor64bitDirectory Directory linux platform windows PlatformLinux platform Go to the bin directory of the client installation directory (CLIENT_HOME ). $ Cd CLIENT_HOME/binUse the file command to verify the

Use Navicat Premium and PL \ SQL Developer in 64-bit Win7 to connect to the Oracle database memo, win7navicat Recently, I took over a project where the server database is oracle 11g 64-bit. Because it is not a development task and you do not want to

Install Oracle 11gR2 (11.2.0.1) and basic configuration (1) on CentOS6.0, and centos6.011gr2First install CentOS6.0. Install it. The only thing to note is the Checking the Software Requirements section in the Oracle 11G Installation guide, which