Oracle

1, if the database machine does not install console or use console to configure the network service name. You can log on to the server idle process by using the command Sqlplus Sys/sys as SYSDBA. Look at step fourth. 2, if the network service name

Difference: 1, the primary key, Oracle can not achieve the increase, MySQL can be achieved since the increase. Oracle new sequence, Seq_user_id.nextval 2, Index: The MySQL index starts at 0 and Oracle starts at 1. 3, pagination,

When you use the start with connect by nocycle prior When you are looking for data recursively, the performance of the following two sections of code is definitely different. Please note that the code can not see the following directly to see my

When you define variables, constants, and parameters in your program, you must specify the Pl/sql data type for them. When writing Pl/sql programs, you can use scalar (Scalar) types, composite (composite) types, reference (Reference) types, and lobs

But using stored procedures has at least two of the most obvious advantages: speed and efficiency. The speed of using stored procedures is obviously faster. In efficiency, if you need to do a series of SQL operations, you need to go back and forth

Copy Code code as follows: public class Oraclejdbctest { String Driverclass = "Oracle.jdbc.driver.OracleDriver"; Connection con; public void init (FileInputStream fs) throws ClassNotFoundException, SQLException, FileNotFoundException,

The following configuration process First, download Oracle Instantclient Download Address: http://www.oracle.com/technetwork/topics/winx64soft-089540.html Download instantclient-basic-windows.x64-11.2.0.4.0 Decompression path: D:\Program Files

This article illustrates the Java implementation method for Oracle to insert the current time. Share to everyone for your reference. The specific analysis is as follows: When I was doing a inser operation,To get the current time into the databaseis

In large database systems, stored procedures and triggers play an important role. Both a stored procedure and a trigger are collections of SQL statements and Process Control statements. Oracle Code CREATE OR REPLACE PROCEDURE gd_cursor

Recently collected some questions about thinkphp connection Oracle database, there are many friends in accordance with the method to connect MySQL operation, resulting in some methods in the Oreale can not be used normally. For example, the

I am still a small rookie of IT industry, to participate in the work time is not long, but with their own a studious heart still have their own learning footsteps never stop, their programming is also a very fruitful ~ ~ It has always been assumed

When the database was created, a password was already set for 4 accounts such as SYS, where SYS and system had administrator privileges to log into the Oracle database using the SYSTEM account in the Sql*plus tool.1, through the data dictionary

MySQL's self-growth is very easy, a auto_incritrem is done, but Oracle is notThe following is the self-growth of Oracle#创建一个表CREATE TABLE t_test_departments (ID number (Ten) not null,description VARCHAR2 ( -Not NULL); #创建一个表CREATE TABLE

1. Take the Windows operating system as an example, open a command prompt, enter the command sqlplus/nolog, enter the Oracle console, enter Conn/as sysdba, and enter in the DBA role.2. After the connection is successful, enter "Select username from

CREATE TABLE SpaceCreate tablespace myfirstspace datafile '/opt/oracle/app/oracle/product/9.2.0/dbs/myfirstspace.ora ' size 512M Autoextend on NEXT 5M MAXSIZE UNLIMITED default storage (initial 128K NEXT 2M pctincrease 0);　　Sql>create tablespace

One, what is transaction transaction is used to guarantee the consistency of data, it consists of a set of related DML statements, the group of DML (data manipulation language, additions and deletions, no query) statement either all succeeded, or

Oracle for a left/right connection are you still using the Ieft join on?If your answer is yes then you're out and call you a simpleHere is the SQL I wrote myselfSelect A.id,a.name,b.grade from STUDENT A left JOIN score B on A.id=b.stuidBefore

/**************************** table Space start****************************/--the role of table space/**1. Determining the spatial allocation of database Entities 2. Set the space share of the database User 3. Control the availability of some data

1. First, create a (new) User: Create user username identified by password; Username: User name for new username Password: New user's passwordYou can also not create a new user, but still use the previous user, such as: Continue to use the

(i) The concept of an indexAn index is a database object related to a table or cluster, which provides a fast access path for querying data, reduces disk I/O, and improves retrieval efficiency.The index is composed of index values and rowid two