Oracle

The Ubuntu source usually comes with Openjava, but there are often strange questions about using Eclipse and Android studio, so it's a personal thought to use Oracle Java to save snacks.The installation steps are as follows:sudo add-apt-repository

Return Array (' Db_type ' = ' Oracle ',//database type ' db_host ' = ' server2008 ',//server address ' db_name ' + ' (description= ( Address= (PROTOCOL=TCP) (host=server2008) (port=1521)) (Connect_data= (SID=MYSID)))

Note the point:1. If it is opened in a tool such as PL/SQL, directly modify the following code [ Italic bold section] to execute2. Ensure that the path exists, such as "D:\oracle\oradata\Oracle9i\", which is the path where you want to save the file

[SQL]View Plaincopy To establish the tablespace and the user's steps: User Create:Create user username identified by "password"; Authorization:Grant create session to user name; Grant create table to user name; Grant create

 View Tablespace usageSelect Upper (F.tablespace_name) "Table space name",D.TOT_GROOTTE_MB "Table space Size (m)",D.tot_grootte_mb-f.total_bytes "used Space (m)",To_char (Round (d.tot_grootte_mb-f.total_bytes)/d.tot_grootte_mb * 100,2),' 990.99 ')

The wildcard characters for Oracle, operators are typically present in the WHERE Condition clause: Operator: equals: =, , >=, <> Contains: In, not in, exists, not exists Range: Between...and, not Between....and Match

Function:1. Allow/restrict the modification of the table2. Automatically generate derived columns, such as self-increment fields3. Enforce data consistency4. Provide audit and logging5. Prevent invalid transaction processing6. Enable Complex

String Aggrhttp://www.oracle-base.com/articles/misc/string-aggregation-techniques.php??SELECT' SELECT '||Columnlists| | ' From ' | | TBL. table_name | | ‘;‘ As Selectsql,' SELECT COUNT (*) as CNT from ' | | TBL. table_name | | ‘;‘ CountsqlFrom

The LAG () and lead () statistics functions are able to fetch the first n rows of the same field and the values of the last n rows in a single query . Such operations can be implemented using table joins to the same table, but using lags and leads

1. Type comparison Oracle Mysql Int Int Number (6,2) Decimal (6,2) Date (sysdate) Timestamp (now ()) VARCHAR2 (20) varchar (20) 2. Common

Oracle stored procedure record in project-common syntax memoAn Oracle stored procedure needs to be written in a project that collects the contents of a complex query (involving multiple tables) and then inserts the qualifying records into the target

After many practices, see the online n multiple articles ... Finally is not match, may I perception too low, unable to experience master's notes. Ultimately, it was done with the help of the seniors. Use the most level of methods to record, so as Wu

(Transferred from: http://blog.csdn.net/zftang/article/details/6387325)1. DIRECTORYSpecify the directory where the dump files and log files resideDirectory=directory_objectThe directory_object is used to specify the directory object name. Note that

Oracle Memory ArchitectureThe basic memory structures associated with Oracle instances include:System global Area (SGA): shared by all server processes and background processesProgram Global Zone (PGA): dedicated by each server and background

In the Oracle database, a control mechanism called "transaction" is provided. Through the thing, can complete the data effective security modification operation, causes the data in the database to achieve the data consistent state. A transaction can

System is a tool, similar to a machine, can be divided into these categories:1. Operational tools---------------------only for users, data entry operation OLTP2. Processing Tools---------------------Calculate the data according to the business model,

The creation of the job will not say, very simple, here is the main point is not in accordance with the specified time automatic implementation of the problemWorkaround:1. Run the jobbeginDbms_job.run (1);//Indicates the job number, which can be

Oracle10g11grac Virtual Environment SwitchOracle 10g 11g rac is installed on a personal virtual machine. The following is a switchover script command.#10g rac> 11g rac ********************************

Oracle fuzzy query methodIn this era of dramatic increase in information, fuzzy queries are essential to help users retrieve desired data from massive data volumes. In Oracle, how does fuzzy search work? 1. We can use the like keyword in the where

Oracle enhanced exercise questions Write simple query statements 1. display all information about the department table Select * from dept; 2. display the Department number and department name Selectdeptno, dname from dept; 3. display the