Oracle

I. PL/SQL(a) What is PL/SQLPL/SQL (Procedure language/sql) is a procedural extension of Oracle to the syntax of a language that adds process-processing statements (such as branching, loops, and so on) to the SQL command language, enabling the SQL

SELECT * FROM EMP ESELECT * FROM Dept DSELECT * FROM Salgrade s--oracle unique function case whenSelectCase 2When 1 Then ' one 'When 2 Then ' two 'When 3 Then ' three 'Else ' other 'Endfrom dual;--oracle Unique function decodeSelect Decode (3,1, '

One, single-table query(a) Simple condition query1. Accurate QueryRequirement: Check the owner record of water meter number 30408Query statement:select * from T_OWNERS where watermeter=‘30408‘Query Result:2. Fuzzy queryRequirements: Check the

There are three conversion functions in Oracle, TO_CHAR (), To_date (), To_number ()1. Usage of To_char ()Formatting the current date timeSelect Sysdate,to_char (sysdate, ' Yyyy-mm-dd ') from dualSelect Sysdate,to_char (sysdate, ' Yyyy-mm-dd hh24:mi:

In Oracle, you need to use sequence when you need to create a self-increment field. Sequence can also be used in MySQL, but there are some differences, in the future to add, first of all the basic use of Oracle sequence summary, convenient for

Please review the supported Platforms page for an Oracle database version supported by the confluence system. You need to upgrade your Oracle database before installing confluence.If you are migrating from another database to using an Oracle

Dbms_stats. Gather_table_stats (Ownname VARCHAR2,TabName VARCHAR2,PartName VARCHAR2 DEFAULT NULL,Estimate_percent numberBlock_sample BOOLEAN DEFAULT FALSE,Method_opt VARCHAR2Degree numberGranularity VARCHAR2Cascade BOOLEANStattab VARCHAR2 DEFAULT

In Oracle, you need to use sequence when you need to create a self-increment field. Sequence can also be used in MySQL, but there are some differences, in the future to add, first of all the basic use of Oracle sequence summary, convenient for

After logging in Sqlplus, use shutdown immediate to shut down the database and exit the window if you do not restart the database using startup, the next time you restart the Sqlplus window, you will be unable to log in, the workaround is as

1. Installing the Oracle 11g dependency PackageTurn off SELinuxVi/etc/selinux/configSet selinux=disabledShutting down the firewallService Iptables Stop[Email Protected]?tmp]#?yum install-y binutils compat-libstdc++-33 elfutils-libelf elfutils-libelf-

Plsql Creating Oracle Timed TasksOriginal yxticRead Catalogue 1. Create a stored procedure for task execution, such as yxtestjob, inserting data into the test table 2, the timer corresponding to the Dbms_jobs folder, right-click New

First, connect Oracle1. Oracle's process of establishing a connectionWhether you connect to Oracle remotely via the Sqlplus command or a third-party tool, you need to establish a connection between the client and the server. The Oracle Net Service

Indexing is slow when synchronizing data you can temporarily disable an index--Disabling indexesALTER INDEX pk_t_auth_userrole_id unusable;--Recovery IndexALTER INDEX Uk_t_auth_user_emp_code REBUILD;--View index statusSelect status from User_indexes

Maven ProjectMain program: Connoracle.java1 Packageorg.guangsoft.oracle;2 3 Importjava.sql.Connection;4 ImportJava.sql.DriverManager;5 Importjava.sql.SQLException;6 7 ImportOrg.guangsoft.util.PropUtil;8 9 Public classconnoracle {Ten Private

1. Install Plsql first. Address: Http://pan.baidu.com/s/1hqGbATI2. Unzip the instantclient_11_2 (this client can find the Lite version on the Internet), find the following path \instantclient_11_2\network\admin Tnsnames.ora file, modify the

Note: This manual is a sample installation based on the RHEL6.6 x86_64 + Oracle 11.2.0.4 version, please refer to. When operating system installation, be aware of installing the graphical interface, or you may encounter various display

(vi) Circulation1. Unconditional loopGrammatical structureloop--循环语句end loop;Example: output 100 numbers starting from 1declarev_num number:=1;beginloopdbms_output.put_line(v_num);v_num:=v_num+1;exit when v_num>100;end loop;end ;2. Condition

One, MySQL database link:Note: The following questionsare as follows: "JMeter4.0" The problem Summary (continuous update) "(including MySQL, Orcale)Preparation: Lead package, package path must be lil bit position, refer to the following map path:1.

Select Inst_id,status,count (*) from Gv$session GROUP by inst_id,status Order by status;$ORACLE _home\rdbms\admin\spreport.sqlOracle database PatrolFirst, the operating system check1. Operating system Resource Usage Top/topas/iostat/vmstat focus on

After creating the user and assigning permissions: Use sqlplus command line tools to access Oracle from the command line sqlplus user/password If your logged-in user is using ' sys ' you need to