Oracle

CREATE TABLE Space1. Syntax CREATE [Smallfile/bigfile] tablespace tablespace_nameDataFile '/path/filename ' SIZE num[k/m] Reuse[, '/path/filename ' SIZE num[k/m] reuse][...][Autoextend [on| OFF] NEXT num[k/m]][MAXSIZE EXTEND [UNLIMITED |

An index is an object provided by Oracle that provides a quick way to access the data, improving the retrieval performance of the database. The index allows the database program to not have a full table scan of the entire table, in which you can

=========== Export ============EXP User name/password @ server (localhost) file= file path. DMP owner= (username)=========== Import ==========1. Login with SystemSqlplusSystemUser nameConn/as Sysdba;Drop user username cascade;2. Create a user and

Normal view and materialized view is not a thing at all, say the difference is recklessly together, first understand the basic concept, the normal view is not to store any data, he only defined, in the query is converted to the corresponding

To build a table statement:CREATE TABLE test1 (ID varchar2 () NOT null primary key);Add a table field:ALTER TABLE test1 Add (name VARCHAR2 () default ' null ' NOT NULL);Add multiple table fields:ALTER TABLE test1 Add (name VARCHAR2 () default ' null

The emergence of Oracle Spatial has led many people to come up with the idea: "Oracle must be the most familiar with its own database products, and Oracle Spatial must have the best performance, in contrast, the day when ArcSDE for Oracle was

When operating the Oracle database, PL/SQL is directly disabled because the execution is complete and no commit is available. Later, the table is locked and this information appears during editing, record is locked by another user!In this case, you

  VaR uniconnection: tuniconnection; uniquery: tuniquery; begin uniconnection: = tuniconnection. create (NiL); uniquery: = tuniquery. create (NiL); uniconnection. providername: = 'oracle '; uniconnection. specificoptions. clear; uniconnection.

PL/SQL single-row functions and group functions A function is a program with zero or multiple parameters and a return value. Oracle has a series of built-in functions in SQL, which can be called SQL or PL/SQL statements. functions are mainly divided

1. Create a table: Create Table stud (Sid int,Sname varchar2 (50))Insert a data recordInsert into stud values (1, 'Tom ') 2. Define a cursor through the package Create or replace package pack_studIs-- Declare a cursor typeType cur is ref cursor;End;3

1. Create a table Create Table stud (Sid int,Sname varchar2 (50 ),Age number,Score number (4, 2 ))And insert some data (manually insert some data)2. Create a function Create or replace function fun_getscores (V_age in stud. Age % Type)Return

Use spring jdbctemplate to perform SQL operations. For each query, update, batchupdate, and execute methods, different connections are called.   Therefore, if you perform data operations on the temporary Oracle table, after you update it once, the

When applying Oracle, you may encounter many seemingly difficult problems. Especially for new users, today I will summarize it and release it to everyone. I hope it will be helpful to everyone! Discuss with everyone and make progress together! For

1. sequence definitionORACLE: Create sequence Increment by Start with Maxvalue /nomaxvalue Minvalue /nominvalue Cycle/nocycle Cache /nocache Order/noorder;DB2: Create sequence As data-type default as integerStart with Increment by default value:

On your backup machine (Windows), write a. BAT file for processing. The content is as follows: 1. Export data by userExp Scott/tiger file = 'd:/data1.dmp'Exp system/system file = 'd:/data2.dmp 'owner = Scott2. Export data by tableExp

I. Linear reference · Oracle Spatial 1. Create a space object for linear reference Figure15 Example of a linear reference space object For example 15, Oracle spatial needs to be created using the following SQL statement: SQL> select sdo_geometry (

1. Run the following SQL command through sqlplus SQL> colcomp_name format A10; SQL> selectcomp_name, status from dba_registry where comp_name = 'spatial '; If the result type is as follows, the installation is successful (the status is valid or

As a powerful database front-end development tool, Delphi provides encapsulation controls for many database access methods. For Oracle Data Access Controls, No matter what database engine, a connection is generally encapsulated as a data set

Requirements:Given data table: wm_testCode name11 B1 c2 In progress2 countries2 persons Required results (the separator can be input by parameters ):Code name1 a, B, c2 middle, country, people This problem can be solved using the wmsys. wm_concat

Occi Introduction Occi: Oracle C ++ call interface (occi), that is, Oracle C ++ API, allows you to access the Oracle database using object-oriented features, local classes, and C ++ languages. The advantages of occi are based on the standard C ++