Oracle

A MySQL Paging1. Scan out the 6000+10 data to remove 10 data volume large book Impact query speedSELECT * from member ORDER by member_id ASC LIMIT 6000,102. Only 10 scanned But the fields used must be in strict order and must be ordered sequentially

--Non-null constraintALTER TABLE Studen MODIFY (studentname not NULL);--Unique constraint (Social Security number)ALTER TABLE student ADD CONSTRAINT uk_student_identitycard UNIQUE (Identitycard);--Default constraint (address)ALTER TABLE Student

:: Backup complete Empty database, including: table, view, sequence, function, package, etc.Exp aaa/[email PROTECTED]/ORCL owner=aaa file=f:\ccc.dmp rows=n statistics=none:: Back up a few table structures and dataExp Aaa/[email PROTECTED]/ORCL

Learning Source: http://www.jb51.net/article/45539.htmhttp://blog.csdn.net/j958703732/article/details/110669351. New data tableSyntax: CREATE TABLE table name (field 1 data type, field 2 data type, ...) Tablespace table SpaceCreate TableSTUDENT

1. Establish a remote connection firstCreate Public database link Link_sjpsConnect to system identified by managerUsing ' (DESCRIPTION =(Address_list =(ADDRESS = (PROTOCOL = TCP) (HOST = 192.168.1.20) (PORT = 1521)))(Connect_data =(service_name =

Deploying WebService on IIS based on OracleCommon Errors and solutions:Cause: Install IIS after installing NETFramework; Solution: 1.c:\windows\microsoft.net\framework\v4.0.30319\aspnet_regiis.exe-iError: System.badimageformatexception: Failed to

--Create a tableCreate TableTestwp (ID Number( A), C_date DATE); Select * fromTestwp;--2. Create a sequenceCreatesequence Wp_seq MinValue1MaxValue999999999999999999999999999Start with 141Increment by 1Cache -; --3. Create a stored procedureCreate

Oracle indexing and SQL optimizationDatabase index:Index has a single column indexThe saying of compound indexHow a field in a table has a PRIMARY KEY constraint and a uniqueness constraint, Oracle automatically suggests a unique index on the

Operating EnvironmentSuse+oracle11gr2Applicable ScenariosShutdown immediate Stop database failedAction Commands1. Kill the Oracle instance-related processPS grep grep grep awk ' {print $} ' Xargs Kill -92. Clear the shared memory segments that

http://blog.csdn.net/liangweiwei130/article/details/38223319 a very detailed description of the various storage typeshttp://www.jb51.net/article/74612.htm how cursor types are manipulatedHttps://www.2cto.com/database/201301/186608.html How to handle

SELECT * from(SELECTE.*, ROWNUM RN from(SELECTID, name, age, birthDate, sex , describe, city, create_by, creat E_date, Update_by, Update_date, Del_flag fromT_employeewhereDel_flag= 0 Order byCreate_datedesc)

First, Oracle downloadNote that Oracle is divided into two files, and after downloading, two files are extracted to the same directory. In the path name, it is best not to appear in Chinese, and do not appear spaces and other irregular

Mysql> Select @rn: = @rn + 1 as rownum, Emp_no, Dept_no, From_date, To_date, from Dept_emp, (select @rn: = 0) A limit 20;+--------+--------+---------+------------+------------+| rownum | Emp_no | Dept_no | From_date | To_date |+--------+--------

first, the recovery of the tablefor the mistakenly deleted table, as long as not using the Purge permanent delete option, then recover from the flash back area hope is quite large. The general steps are:1. Query the deleted table from Flash

Enter the parameter$in 1 = ' 2017-01-01 '; Must fill in$in 2 = ' 2017-08-01 '; Must fill in$in 3 = "; Optional fill $tns = ' (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = 0.0.0.0) (PORT = 1521)) (Connect_data = (service_name = dbname ) (SID =

Asked a question yesterday by a colleague, the question is the if logic block in the Oracle stored procedureTell him about it:Create or Replace procedureTestifelsif (Numb Number) is 　　 begin 　　　　 ifNumb= 1 ThenDbms_output.put_line (1); Else ifNumb=

Yesterday encountered a problem, record, SQL is as follows: 　　 SelectTt.* from (　　　　Selectu.chapter_id as"Chapterid", Case whenu.chapter_id=u.f_id ThenU.chapter_nameElse '123' End as"Chaptername",U.update_time as"UpdateTime" fromt_user_info u)

Overview of common related viewsDba_sys_privs: Querying system permissions owned by a userUser_sys_privs: system permissions owned by the current userSession_privs: All permissions owned by the current userRole_sys_privs: system permissions owned by

What is a sequence?A sequence is a database object used to generate a unique, contiguous integer. A sequence is typically used to automatically generate a value for a primary key or unique key. Sequences can be in ascending order or in descending

What is a tablespace?The Oracle database contains logical and physical structures.The physical structure of a database refers to a set of operating system files that make up a database.The logical structure of a database refers to a set of logical