Oracle

A view is a virtual table that does not occupy physical space because the definition statements of the view itself are stored in the data dictionary. The data in the view is obtained from one or more actual tables.Materialized views: Also into a

Create or Replace procedure Sum_info is I integer;temp1 varchar2 (100) temp2 varchar2 T1 DATE;T2 ); v_sqm varchar2 (+); U_name t_temp.u_name%type;t_name t_temp.t_name%type;c_name t_temp.c_name%type;cursor tb_list Is select U_name,t_name,c_name from

Common driver and connection strings for Oracle1.oledb Drive Connection string:Both Oraoledb.oracle.1 and OraOLEDB.Oracle canProvider=oraoledb.oracle; Data source= (description= (address= (protocol=tcp) (host=192.168. 0.12) (port=1521))

First, the data table name is T_office, its primary key is PID (number type)Second, create a sequence for the PID field of the data table firstSequence Name: S_t_office_pidSequence Details:Third, create the corresponding triggerTrigger Name:

left join (left join)      ---Returns records that all records in the left table and the condition fields in the right table are equal. right join (right join)    ---Returns all records in the right table and records with the same junction fields in

Environment descriptionOracle 10.2.0.4Windows 20082. Description of the problemAccording to the field engineer description, the customer restarted the PC server, up after the start of monitoring very slow very card, database status open cannot login3

First execute Sqlplus/as sysdba with Oracle user, enter Sqlplus,Then first look at what data files are currently available sql> select name from V$datafile; And then we see a/u01/app/oracle/oradata/sid/test.dbf in the results.Then close the database

In the development we often encounter such a scene, column, such as user modification simple personal basic information, this time need to determine whether the user's basic information exists, if the first entry does not exist in the table insert a

UPDATET_ASN_DTL AD1SETAd1.cf03=( SELECTAc. TH003 from"T_asn_dtl_copy" ACWHEREAc.udf06=Ad1. Inspecter_name andAc.udf05=Ad1. LINE_ITEM_NO)WHERE EXISTS(SELECT 1 from"T_asn_dtl_copy" acWHEREAc.udf06=Ad1. Inspecter_name andAc.udf05=Ad1.

Memory areas and background processesShared PoolThe shared pool is the most complex SGA structure, and it has many sub-structures, so let's look at a few common shared pool components:　　1. Library Cache : library cache This area of memory caches the

Common Operations for inductive indexing today 1) indexes are divided into B-tree indexes and bitmap indexes. Create Create index Scott. event_index On Scott. Event (name) Pctfree 25 Storage (initial 500 K) Tablespace system; If it is a bitmap index,

In Oracle 10 Gb, every time you use em in the web form, you will find that after some operations, you have to enter the preferred authentication, because Oracle will wait until you can allow Use the operating system certificate. If the

Oracle split table /*************************************** **************************************** * ******** Oracle split and MERGE table Organizer: china (Roy) Date: 2011.11.02 *************************************** ****************************

In the book written by Tom, this part is still relatively detailed. But in general, the basic concepts should be clear, so noteProgramWhat employees need to know1. Range Partition) Create Table range_example(Range_key_column date,Data varchar2 (20)

1. Run the source file in compatible mode during installation. 2. After installing Oracle 10 Gb, run em and the interface is displayed, but an error is reported:Java. Lang. Exception: exception in sending request: NULLMany functions are not

'Oracle 9i contains the XDB feature by default when creating a database. Once the database and listener are started, the HTTP service of Oracle XDB occupies port 8080, which is in conflict with default ports such as JBoss and tomcat. The port

I want to start to systematically learn some basic Oracle knowledge. Although I am not a DBA, I want to learn some basic knowledge well this time. So I plan to take notes and make an outline, which is too specific. The content is not listed. Only

. NET and Oracle access, after all, is not a mother-in-law, and sqlserver is a little different.   1. namespace selection: Access the Oracle database through the system. Data. oracleclient, system. Data. oledb, and system. Data. ODBC namespaces.

Use PLSQL developer to write packages and packages. Remember not to execute them simultaneously in the same SQL window., For example, in an SQL window Create or replace package my_package isFunction getrowcountbytable (tablename in varchar2) return

  Dual is a virtual table used to form the select syntax rule. Oracle ensures that there will always be only one record in dual. We can use it to do a lot of things, as shown below: 1. view the current user. You can execute the following statement