Oracle

  Introduction to Oracle Spatial:First, Oracle supports custom data types. You can use arrays, struct, or classes with constructors and functions to define your own object types. Such an object type can be used for the Data Type of attribute

1. Software Download: Address: http://www.oracle.com/technetwork/cn/database/10203vista-088351-zhs.html An Oracle account is required for downloading. If you have not registered one, you can. 2. software installation: 1)Open the file "\

Function Comparison of common functions of SQL Server and Oracle 1. Absolute ValueS: Select ABS (-1) ValueO: Select ABS (-1) value from dual 2. INTEGER (large)S: Select ceiling (-1.001) ValueO: Select Ceil (-1.001) value from dual 3. Round (small)S:

Common methods for compiling invalid objectsThere are some invalid objects in the database. There are many reasons for this phenomenon. The most common one is Database Upgrade (such as modifying the table structure) and migration. There are two ways

  -- TableCreate Table Test (names varchar2 (12 ),Dates date,Num int,Dou Double );-- ViewCreate or replace view vi_testSelect * from test; -- SynonymCreate or replace synonym AAFor dbusrcard001.aa; -- Stored ProcedureCreate or replace produce dd

Files in the Tomcat directory to be configured   /CONF/context. xml   In , add   Name = "JDBC/oracleds"Auth = "Container"Type = "javax. SQL. datasource"Driverclassname = "oracle. JDBC. oracledriver"Url = "JDBC: oracle: thin: @ localhost: 1521: orcl"

DB. Java   Import java. SQL. connection;Import java. SQL. drivermanager;Import java. SQL. sqlexception;Import java. SQL. statement; Public class dB {Private string sdbdriver = "oracle. JDBC. Driver. oracledriver ";// Private Static string url =

The rownum field in Oracle is a strange field. Take a test table with 26 records as an example.Select * from test where rownum> = 1;Select * from test where rownum> = 2;Select * from test where rownum 26 records were found in the first SQL statement,

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I have nothing to do today, but I want to know about the Linux system. Of course, it is mainly for the deployment of most projects, so I will first start with the database. Of course, there is no relationship between the two, it's just an order of

About Oracle Export Import and the $ symbol about Oracle There are still a lot of things I learned. In fact, I just didn't take the correct path, but I just thought that I could go on the path I understood.First, export the data directly.CMD>Exp

When processing the clob character field, if the string is directly passed to oracleparameter, an exception occurs when the string length exceeds 4000: ORA-01460: conversion requests cannot be implemented or unreasonable Because the maximum length

Recently, this problem caused me a headache for a long time. When there are few people, the connection is normal. However, when there are many people, this problem occurs when I connect to the database. I found a lot of information, some documents

Exp document/document2009 @ document owner = Document rows = y compress = y buffer = 65536 feedback = 100000 file = D:/document. dmp log = D:/document. Log Exp WHD/whd2009 @ whddb owner = WHD rows = y compress = y buffer = 65536 feedback = 100000

This error is also caused by operations on a table, such as update and truncate. In addition, if the transaction is not committed, other operations may also cause this exception.     ORA-00054 resource busy and acquire with Nowait specifiedCause:

1. Select select_listFrom tableWhere expr operater(Select select_listFrom table );1) expr operater includes comparison operators:Single-line operators (=,>, >=, )Multi-line operators (in, any, all)2) subqueries can be embedded in the following SQL

The following describes how to use common data dictionaries for oracle users by category.I. Users   View the default tablespace of the current userSQL> select username, default_tablespace from user_users; View the role of the current userSQL> select

Oracle DatabaseMedium,Set shortcut keys for PL/SQLThe method is what we will introduce in this article. After learning about these settings, we can use the Oracle database more efficiently. Next, let's take a look at this part. 1. My objects is

-- There are usually some fixed database operations in applications, and we often define some stored procedures for those fixed operations. These stored procedures can simplify the development and maintenance of client applications. It can also

44. hextorawConverts a hexadecimal string to a binary string. 45. rawtohextConverts a binary string to a hexadecimal string. 46. rowidtocharConvert the rowid data type to the character type   47. to_char (date, 'format ')SQL> select to_char