Oracle

numeric function: Absolute value of ABS (m) m MoD (M,n) m is the remainder after the n is removed Power (M,n) m's n-th-side Round (M[,n]) m rounded to n digits after the decimal point (n defaults to 0) Trunc (M[,n]) m truncates the value of n-bit

A thorough set of deletions containing data files and content is emitted, and if used manually, DBAs will be extremely cautious in spelling such commands: Wed May 02 10:46:09 2012/* Oracleoem */DROP tablespace "Wndt" including CONTENTS and

There are four main functions in Oracle that support regular expressions: 1,regexp_like: Similar to like function 2,REGEXP_INSTR: Similar to INSTR function 3,REGEXP_SUBSTR: Similar to SUBSTR function 4,regexp_replace: Similar to REPLACE function

Grammar The code is as follows Copy Code InStr (string1, string2 [, Start_position [, Nth_appearance]]) String1 is the string to search for. string2 searches for substrings in string1. Start_position is where

Oracle self-Adding column creation method collection Oracle does not have such features as the self-adding fields, but it can be implemented by triggers (trigger) and sequences (sequence). First build a test table: CREATE TABLE Userlogin( ID

Whether the instrumentation field in Oracle includes Chinese charactersSELECT *From (SELECT ' ABCdef ' AA dualUNION ALLSelect ' ABC what is this de ' AA from dualwhere AA <> convert (aa, ' us7ascii ', ' ZHS16GBK '); Aa --------ABC what is this

Oracle Database Tutorial Connection method and codeOracle Connection StringsOracle ODBC Connection StringsOpen connection to Oracle database using ODBC"Driver= {Microsoft odbcfororacle}; Server=your_oracle_server.world; Uid=your_username;

Copy code code as follows: Declare Cursor C1 is select * from T_depart; V_depart T_depart%rowtype; Type V_code_type is table of T_depart.depart_code%type; V_code V_code_type; Type V_name_type is table of T_depart.depart_name%type; V_name

First, the query table basic information Select Utc.column_name,utc.data_type,utc.data_length,utc.data_precision, Utc.data_scale,utc.nullable,utc.data_default, Ucc.comments From User_tab_columns utc,user_col_comments UCC where Utc.table_name =

User name / Password Logon identity Description class= "MsoNormal" >sys/change_on_install sysdba or sysoper cannot be normal login, as the default system administrator class= "MsoNormal"

UNIX shutdown order, first shut down the database, then the operating system, and finally the power downOnly users with SYSDBA and Sysoper system privileges can start and close the database.You should start the listener before you start the database,

Example 1 The code is as follows Copy Code –select * from TMN_ZHBG ORDER BY id DESCSelect ID, mc,fs,class,sum (FS) over (the order by Fs,id) continuous accumulation, sum (FS) over (order by FS) continuous accumulation of

1. After installing Oracle database: Execute Dbstart and Dbshut will prompt: The code is as follows Copy Code [oracle@oracle11g ~]$ DbstartOracle_home_listner is isn't SET, unable to auto-start Oracle Net ListenerUsage:

Connecting to an Oracle database is simple, as follows The code is as follows Copy Code Connectionstring= "PASSWORD=CZH; User id=czh;data source= (description= address_list= (address= (protocol=tcp) (host=192.168.168.211

Problem Handling methods:Query: Select Userenv (' language ') from dual;Compare the value of the computer environment variable Nls_lang with the query result, if not, modify the computer environment variable Nls_langAfter solving the problem, we

Because of the project needs, in a Query page query field Support multi-keyword query, support space-delimited query conditions, it is implemented as follows:The principle used is: thefunction Regexp_likethat supports regular expressions in Oracle,'

Common Database object tables: A basic collection of data stores, composed of rows and columns: Logically related data collection sequences extracted from a table: Provides a regular numerical index: improve efficiency of queries synonyms: Aliases

The editor reminds you of several notes.1. Configure. net to debug web applicationsIf the installation disk is FAT32, you must change the settings in IIS. IIS-> default web site (right-click)-> all tasks-> Configure Server extensionIf the mounting

A. Username system password linuxman export to D:/linuxidc. dmpExp system/linuxman @ SID file = d:/linuxidc. dmp full = yB. Export the tables of system users and sys users in the databaseExp system/linuxman @ SID file = d:/linuxidc. dmp owner =

Example: delete table space abc,First, log on to the database as a sysdba user.$ Sqlplus/as sysdbaDelete tablespaceDrop tablespace abc including contents and datafiles;Because the database is used by the development environment, there are many user