Oracle

ORACLE Learning notes ORACLE Staging tables and versions storage structure for ORACLE tables: control the structure of the file:Data files:the structure of the BLOCK:Table Delete Comparison:The storage structure of the row:The line is tightly stored

First, the indexThe data in the table is unordered, so it is called the heap table, which means that the data is stored randomly. Because the data is stored randomly, a full table scan is required when querying. The index is the order of the

Oracle take month-without the previous 0Today, just take the month and the number of days, if there are 0 in front of the month to remove 0. For example, 2010-01-08, the required result is 1-8. Leads to a series of SQL statementsFirst: Using

Follow the steps below to adjust the memory1. Sqlplus/nolog2. Conn/as SYSDBA3. Show parameter target4. Show Parameter SGAAlter system set SGA_MAX_SIZE=512M Scope=spfile;Alter system set SGA_TARGET=512M Scope=spfile;5. Show parameter memoryalter

The code for calling the Oracle stored procedure in C # looks like this:1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Collections.ObjectModel;4 usingSystem.ComponentModel;5 usingSystem.Configuration;6 usingSystem.Data;7

A year of DBA work, experience is still shallow, but encountered problems can always be solved, today, I met a more wonderful problem.Operation and maintenance personnel told me that after the afternoon ETL has been stuck did not continue, then I

Xiao Feng 91Subquery: When the result of one query is the condition of another query, that is, a SELECT statement embedded in another SQL statement becomes a nested query.A subquery can return a single row of results, can return multiple rows of

Returns a non-null value from two expressions.GrammarNVL (EExpression1, EExpression2)ParametersEExpression1, EExpression2If the eExpression1 evaluates to a null value, NVL () returns EEXPRESSION2. If the EExpression1 evaluates to a value other than

There should be no corresponding method for the time being, so I use my own good method to modify/* Modify the original field name to name_tmp, change the field you want to change the name to a useless/temporary field */Alter table name Rename

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Oracle deletes duplicate data with only one query and the SQL statement to delete duplicate records--1, look for redundant records in the table, duplicate records are based on a single field (ID) to determineSelect * fromTablewhereIdinch(SelectId

window function First_value/last_valuerowsbetween... preceding and. .. followingrangebetweeninterval CurrentRowlag (sum(Tot_sales),1), lead--① List of monthly orders and total orders for the whole year--② lists the total monthly orders and the total

(Rank, Dense_rank, Row_number) ①row_number:12345The row_number function returns a unique value that, when the same data is encountered, is incremented sequentially in the order in which the records are recorded in the recordset. ②dense_rank:12223The

Exp Upms/[email PROTECTED]:1521/ORCL File=d:\upms.log full=y#oracle11g导入导出命令 #EXPDP upms/[email protected]:1521/orcl directory=data_file_dir dumpfile=upms0823.dmp logfile=UPMS0823.log schemas= UpmsIMPDP sys/[email protected]:1521/orcl directory=data_

Question one:When you run Runinstaller, specify the path of compression. /stage/components/oracle.jdk/1.5.0.17.0/1/datafiles "is invalid. The decompression command failed. Please check the Oraparam.ini.Check that there are no JDK files in the

1. The super Administrator is logged in Oracle:sqlplus/as sysdba  2. Displays the current connected user sql> show User3. Create a new user and authorize sql> to create a user a identified by A; Built under system table space) Pl/sql> grant

Beginner Oracle, a lot of statements can't remember, write here memo.1. View data files for a table spaceSelect file_namefile name, Tablespace_name table space name, bytes/1024x768/1024x768size m,maxbytes already used/1024x768/1024x768/1024x768Total

Recursive operation of Oracle (tree operation) Start with org_id = ' 1 ' Connect by prior parent_id=son_id 1. Preface    Oracle's recursive operation, in our web page directory structure will be used frequently, is said to be the interview often out

1 --Oracle Data Backup (three methods)2 --1. Logical backup and Recovery: Using Oracle-provided tools, import/Export (EXP,IMP), Data3 --Pump Import/Export (IMPDP,EXPDP), loader (Sql*loader)4 --2. Offline backup and Recovery: refers to the physical

first, the SQL base languageDECLARE -- Statement varchar2 (ten-- Variable or object BEGIN A:=' Xiao Ming ') ; -- : = denotes assigning a value to a variable - - output with Dbms_output.put_line () END;Second, branchDECLARE --StatementA