Oracle

Differences between Oracle-Decode () and case statements: Example: 1. Case statement: Select case sign (5-5) When 1 then 'is positive' When-1 then 'is negative' Else 'is 0' end From dual; Background implementation: If (sign (5-5) =

Confusing terms:Db_name:The unique identifier of a database (Oracle database), which is the Oracle database described in Chapter 1. This expression is sufficient for a single database, but with the popularization of distributed databases composed of

This small problem is also common today. Record it. Query data within an input range: Select * From Table1 where fld1> = A and between Both A and B are optional input items, which have the following combinations: 1: A has a value, B has no

A few days ago, I wrote an oracle procedure to extract useful data from many irrelevant Excel files and insert them into a table in the form of a single record, I used two nested cursors in procedure to traverse and judge the results. After

The following table lists the Oracle9i databases: The commit operation does not forcibly write the database buffer content to a file. After the commit operation, the server process will release the lock for related resources only after prompting

Introduction to common Oracle services in Windows     Note: Sid-Database ID Home_name-Oracle Home Name, such as orahome92 and orahome81 (1) oracleservicesid Database Service, which automatically starts and stops the database. If a database is

Oracle optimization policy reference: Tool usedStatspack Install statspackCreate a tablespace of about MB, such as perfstatRun SQL plus on the server (log on to the Sys as sysdba user)@? /Rdbms/admin/spcreate Running collection methodsExec

Connect using the system. Data. oracleclient. dll component: First, configure the webconfig file;   Then you can add a reference to system. Data. oracleclient. DLL to write it on the page.CodeUsing system. Data. oracleclient;   Common

Standardization refers to the process of removing redundancy from your data storage. If the database design is fully standardized, when all the tables are connected by keywords, no data repetition will appear ). The advantage of standardization is

You can use the connect by and start with clauses in the SELECT command to query the tree structure of the table. The command format is as follows:Select .....Connect by {prior column name 1 = column name 2 | column name 1 = prior column name

Method 1 Today, I want to compare two characters in the stored procedure, but I found that the expected results were not obtained. The main problem is that the comparison of any value and null results are null, I found two methods on the Internet

Recently, considering the usage of temporary tables in the writing and Storage Processes on the database end, we do not know how the Database End is processed, and whether the processing method is the same as that of SQL Server, are there any

JDBC thin, OCI: two Java methods provided by Oracle to access the Oracle database thin is to use Java to access the database, the advantage is that you do not need to install the client OCI, that is, to use Java to call the local Oracle client and

Summary of usage of temporary tables in Oracle databasesHttp://computer.online.sh.cn 2004-11-11 16:41:00 Note: Some descriptions and examples belowCodeFrom csdn, we will not specify the source one by one. I would like to express

quote: 1. How to operate a table after a partition is created. Answer:A normal table is like a Xinhua Dictionary used by a primary school student. A partitioned table is

I recently summarized how to set the Oracle primary key. paste it here and save it. There are two ways to set a primary key, one is auto-incrementing primary key, and the other is to generate a unique sequence. I. Auto-increment primary key --

OCR command Series Oracle clusterware places the configuration information of the entire cluster on shared storage, which is OCR disk. in the entire cluster, only one node can perform read and write operations on the OCR disk. This node is called

1. Check the character set when the Oracle database is created: Oracle Server execution SQL>Select name, value $ from SYS. Props $ where name like 'nls % '; NAME value

Select E. employee_id, E. last_name, D. department_id, D. department_nameFrom HR. Employees e left Outer Join HR. Orders ments dOn E. department_id = D. department_idSelect E. employee_id, E. last_name, D. department_id, D. department_nameFrom HR.

Microsoft ole db provider for Oracle (0x80004005) Error Type: The Oracle client and network components are not found. These components are provided by Oracle and are part of Oracle 8i (or higher) client software installation. These components