Oracle

ArticleDirectory It is a small problem to install oracle on Windows Server (cpup4 ). It is a small problem to install oracle on Windows Server (cpup4 ). My development environment is. net, so I didn't install Java. Today I saw an

In development, everyone should have done something similar to department management. Generally, there is a lower-level department (sub-department) under the next department. This level is similar to a tree. In this case, the Parent and Child

1) create a storage directoryMkdir backup 2) Write a shell script #! /Bin/bashExport oracle_base =/opt/Oracle -- the path must be changed according to the actual path.Export ORACLE_HOME = $ oracle_base/ora10gr2/db_1 -- the path must be changed

Select typecode, lpad ('', 4 * level-1) | typenameFrom ajtypeStart with p_code is null connect by prior typecode = p_code; Result: 1 + City appearance and sanitation 15 + Lighting management 151 +

In section 1st, I listed this SQL statement as an incomprehensible error. This time I was instructed by someone else. I finally figured it out. Public String getLimitString (String SQL ){StringBuffer pagingSelect = new StringBuffer (100

I try to add generated item for the oracle lob adapter and get this error: Connecting to the LOB system has failure. ORA-1017: invalid name/password After a lot of searching I found the problem: User name. The Oracle Database adapter preserves the

Document directory Read Committed Isolation Serializable Isolation Isoation eve) The isolation level defines the degree of isolation between transactions. Isolation level and concurrency are mutually contradictory: the higher the degree of

Although EF6 is coming soon, it is a big pity that Oracle databases can only be programmed with DB first and Model First, rather than Code First. Let's take a look at how EF uses DB first and Model First to program Oracle. First we want to download

/*There are four functions that support regular expressions in ORACLE:1. REGEXP_LIKE: similar to LIKE2. REGEXP_INSTR: similar to INSTR3, REGEXP_SUBSTR: similar to SUBSTR4. REGEXP_REPLACE: similar to REPLACEThey are used in the same way as Oracle SQL

To query the total number of fields in a table in Oracle, use an SQL statement or Copy codeThe Code is as follows: select count (column_name) from user_tab_columns where table_name = 't_ B _AUDITOR' The number of fields in the specified table can be

1. What is the Oracle character set?The Oracle character set is a collection of symbols for the interpretation of byte data. It can be divided into different sizes and have an inclusive relationship. ORACLE supports the national language

A table can be partitioned by range, hash, or list. After the table is partitioned, the indexes on the table are different from those on the normal table. oracle classifies the indexes on the partition table into two types: Local and global

Summary NHibernate2.1.1 can finally call the stored procedure of Oracle, but you must use nhib.pdf. driver. oracleDataClientDriver Driver (Oracle. dataAccess. dll), but this will cause hbm2ddl. keywords throws an exception, so it is not

Similar to other database systems, Oracle uses "|" to concatenate strings, which is the same as the plus sign "+" in MSSQLServer. For example, execute the following SQL statement: Copy codeThe Code is as follows: SELECT 'employee ID is '|

1. After ODP. NET 10.2 is installed, its Net Manager and Net Configuration Assistant cannot be opened. After clicking the Start menu, there is no response. My solution: uninstall ODP. NET 10.2 and reinstall ODP. NET. Pay attention to the following

Assume that there is such a table: Copy codeThe Code is as follows: create table S_Depart ( DepartId INT not null, Parameter Name NVARCHAR2 (40) not null, DepartOrder INT default 0, Constraint PK_S_DEPART primary key (DepartId) ); In oracle,

Fine-grained auditing (FGA) is introduced in Oracle 9i. It can record SCN numbers and row-level changes to recreate old data, but they can only be used for select statements, not DML, such as update, insert, and delete statements. therefore, for

What should we do when defining the field name and alias with the same name as the oracle keyword? In fact, it is very easy to add "", such as "group" to this keyword" See the following example: Copy codeThe Code is as follows: SQL> DROP TABLE

Round (x [, y]) [Function] returns the rounded value. [Parameter] x, y, numeric expression. If y is not an integer, the y integer is truncated. If y is greater than 0, the rounding is y decimal, if y is less than 0, it is rounded to the y place to

Today I encountered a strange problem:Using sqlplus on the client allows normal users to log on, but neither system nor sys users can log on, prompting ORA-12154: TNS: unable to resolve the specified connection identifierSQL> conn system @