Oracle

These two days did the import and export table data for Oracle.1.oracle provides three ways to import and export files, (1) Oracle Export/import (2) SLQ export/import (3) PL/SQL Export ImportThe second method is suitable for import and export of

1,regexp_like: Similar to the function of like2,REGEXP_INSTR: Similar to the function of INSTR3,REGEXP_SUBSTR: Similar to the function of SUBSTR4,regexp_replace: Similar to the function of REPLACEThey are used in the same way as Oracle SQL functions

Multi-table query basic SyntaxThe Cartesian product is implemented in SQL as a cross join. All connections are made to the temporary Cartesian product table, the Cartesian product is a concept in relational algebra that represents any combination of

1, the characteristics of the indexA, a large table with read-only me or less insert, update, or delete operations can improve query speed.b, you can index one or more columns of a table.C. There is no limit to the number of indexed builds.D, the

SQL code 1. Error name error code error meaning 2. Cursor_already_open ora_06511 attempts to open a cursor that is already open 3. Invalid_cursor ora_01001 attempting to use a cursor that is not open 4. Dup_val_on_index ora_00001

1. View instance name: Show Parameter instance_name2. Check to see if the database archive is open: Archive log list3. View SPFile parameters: Show Parameter SPFile4. View Log file location: Select Group#,member from V$logfile5. View archived files:

Create userOverview: In Oracle, to create a new user using the Create USER statement, you typically have DBA (database administrator) permissions to use.Create User by password;(Oracle has a problem, the password must start with a letter, if it

Oracle database installation to reserve 5G space, Oracle Common version· Oracle8, oracle8i: where "I" means the Internet, which means that Oracle is starting to evolve to the network,· Oracle9i: Is the stable version of Oracle8i, but also now see

Set head offSet Lin 150Set pages 0Set Long 10000Select TEXT from User_source t where T.name = upper (' get_car_status_new ') Order by TYPE, line;=======================Set pages 0Set Longchunksize 3000Set Long 2000000000Set head offSet Linesize

Set Linesize 120Set PageSize 20Column file_name format A8V$nls_parameters a table in the data dictionaryNote about NULL:1: Empty expression with null result2: Determine whether a value equals null is used is does not equal with IS. Remember

1. Using Dba_viewsFallback to a specific time period to view the definitionSelect View_name,text from (SELECT * from Dba_views as of TIMESTAMP (systimestamp-interval ' 5 ' hour-interval ' "min Ute)) where view_name= ' vp_taskclass_info ';Note that

1. View the current user's basic information SELECT * FROM User_users 2. View the role of the current user SELECT * FROM User_role_privs 3. View System permissions and table permissions for the current user

C # connecting Oracle databases can implement many of the features we need, and here's how C # connects Oracle database query data, and if you're interested in C # connecting to Oracle database, you might want to take a look at this.Using System;

--Query field name, field type, field comment Select dd.*, EE. Constraint_type from (SELECT t.column_id, T.column_name, (case when (t.data_t YPE = ' VARCHAR2 ' OR t.data_type = ' RAW ' then T.data_type | | ' (' | | T.data_length | |

Which linker and compiler are used when relinkOracle software is used? Which linker and compiler are used when relink Oracle software is used? Reference:Required linker and compiler locations (Document ID 1012798.6)Problem Description:===============

Oracle ---- Data OperationsInsert Null ValueRun the following query: Insert into emp (empno, ename, job, sal) VALUES (1005, 'yang hua', 'cler', null ); Copy Data:Multiple rows of data can be inserted at a time. Step 1: Create a new table manager:

Oracle learning path (6) two practical examples1. Simple data insertion example -- Created on 2015/6/15 by LYH declare v_fnumber varchar2(10):='qwe'; v_fname varchar2(10):='lyh'; v_fage int:=10; v_fsalary int:=101.00;begin INSERT INTO

[Oracle] First Trial of Oracle I don't know how much you know about Oracle? Is it just to the extent that it can be used. In this case, I will follow my steps to learn more about Oracle and unveil the secrets of Oracle. For the installation of

Startupalter. logspfile. ora SQL> select * from v $ version where rownum = 1; BANNER implements Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-ProductionSQL>! Cat/etc/issueEnterprise Linux Enterprise Linux Server release 5.5 (Carthage)

ENABLE_DDL_LOGGING initialization parameters for the new 11g feature ENABLE_DDL_LOGGING starts from 11g, but there are bugs in 11.2.0.2 and 11.1.0.7. This bug is described: Bug 12938609-ENABLE_DDL_LOGGING does not log RENAME table statements