Oracle

15/03/21 use functions for yearly, monthly, weekly, daily data summariesSuppose a sales schedule sale_detail contains a country (country), sales time (sale_time), sales ( Sale_money ) .. waitThe SUM function sum() and grouping clauses need to be

What can select do?650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/71/A9/wKiom1XV-dXjc32KAAHWZqCVaRI172.jpg "title=" 01.PNG "alt=" Wkiom1xv-dxjc32kaahwzqcvari172.jpg "/>Projection: The specified column in the query table.Selection: The

Oracle outer JOIN (OUTER join) Left OUTER join (the table on the left is unrestricted) Right outer join (the table on the right is unrestricted) All-out connection (both the left and right tables are unrestricted) Corresponds

Definition of 1.pl/sql:PL/SQL (Procedure language/sql)Plsql is Oracle's procedural extension of SQL languageRefers to the addition of process-processing statements (such as branching, loops, and so on) in the SQL command language, enabling the SQL

In order to generate some resources for the release of the library. Requires the API module to be migrated to MySQL in, need to boot data.Try the Oracle to MySQL tool. When migrating errors do not say that such a large amount of data, with such a

Some simple command comparisons for Oracle and MySQL1) sql> Select To_char (sysdate, ' Yyyy-mm-dd ') from dual;Sql> Select To_char (sysdate, ' Hh24-mi-ss ') from dual;Mysql> Select Date_format (now (), '%y-%m-%d ');Mysql> Select Time_format (now (),

first set up a computational function>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>Create or Replace function count_rows (table_name in VARCHAR2,Owner in varchar2 default null)return numberAuthid Current_UserIsNum_rows number;stmt

Only one download is required on Oraclecalled Instant Client package software can be, this software does not need to install, as long as the decompression can be used, very convenient, even if the system is re-installed can be used. :

Catalog is a stand-alone database used to store Rman metadata obtained from control files in the target database. RMAN propagates information about the database structure, archive redo logs, backup sets, and copies of the data files from the control

We talked about it last time. Rman provides backup of full-database backups, table space backups, data file backups, archive log backups, control files, and parameter files. The files that Rman backs up are called backup sets, and Rman backs up only

Internal structure The B-Tree index is dumped into a tree-like form and rendered: alter session set events ‘immediate trace name treedump level INDEX_OBJECT_ID‘; sql> alter session SET events ' immediate trace name treedump level 126

Good food is not afraid of late--remember my Oracle database careerMy first job is in an ERP software company to do ERP software technical support, in the process of maintaining ERP software, I contacted the Oracle database, gradually have a strong

another good article:http://www.cnblogs.com/java-pan/archive/2012/09/16/oracle_job.htmlThere are two ways to do a timed mission.One is: Operating system timing, win timed tasks, Unix crontabOne is: database-level timing, she's more efficient,There

If the C_xml field in the tab table turns out to be a blob type, we will convert it to the CLOB type, and if there is data in the table, it cannot be modified directly through the alert statement. You can change the field of a BLOB type to the CLOB

Verifying the installation ? operate on both nodes to Grid User Actions1 , check CRS Status[Email protected] ~]# Su-grid[[email protected] ~]$ CRSCTL Check CRSCrs-4638:oracle High Availability Services is onlineCrs-4537:cluster Ready Services are

1. Locate the Listener.ora listening file, in the exact location: D:\app\Administrator\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora2. Found in the Lisener.ora file(Sid_desc =(Sid_name = Clrextproc)(Oracle_home = D:\app\Administrator\product\11.

SQL Server played for some years and recently wanted to play Oracle, so I thought of playing with an Oracle server. The first time you install Oracle under Linux, the entire process references an article:

Oracle table connection-No data is displayed in the other table during the connection process. oracle-related data A data table is basically difficult to meet our query requirements. At the same time, it is not a good database design to save all the

Oracle database download and installation [entry required]   Step 1 download oracle: : User name and password on the oracle official website: (you can use the following if you do not want to note it) User: wangdetian168@gmail.comPass:

Oracle Database Import and Export, oracle Import and Export 1. Export Oracle Data A. Use the command line to export data Exp username/password @ database file = fullpath (for example, D: \ data. dmp) full = y B. Use the tool (PLSQL Developer) to