Oracle

As Oracle confirms the remaining 4 Java 9 features, the next generation of Java plans is beginning to become clearer, and Oracle has unveiled the second set of Java 9 features. Since Oracle announced 3 new APIs and modular sources earlier this year,

I. Description of the official websitehttp://download.oracle.com/docs/cd/E11882_01/server.112/e26088/functions088.htm#SQLRF00658PurposeThe length Functionsreturn the length of char. Length calculates length usingcharacters as defined by the input

Error inserting data into Oracle database:After troubleshooting, because there is no error in the update data, there is no problem with Oraclehelper:See exception information hint: invalid variables and data, should be the problem of SQL statement,

这两天啊有一个心的业务，是需要如果我批量修改数据的话，那么另一张表的数据也需要修改，也是多条的修改，发现这个问题的时候，自然而然的想到了触发器，但是以前都是简单的单条语句的跟新，没有过整个表的去做一个触发器，今天学习了一下数据库中的循环，这里写一下。 在写触发器的时候用到了一个循环和一个Cursor，触发器如下：create OR replace trigger trg_test before update on cm_bogie_inandoutreport

Long time no blog, in the study of Oracle has already learned MySQL, thought in learning Oracle should be a lot easier, but, I think wrong, Oracle is more difficult than MySQL on a level, mainly in the following areas to send:1:oracle's authority

Description of stored procedure and stored function: Store function has return value! The stored procedure does not return a value!A subroutine stored in a database that is called by all user programs is called a stored procedure, stored

--Delete the original table: Drop table emp;--CREATE table empcreate table emp ( deptno number, ename varchar2 (), Sal number );-- Insert data--Department 1 Employee information INSERT into EMP values (1, ' King Hee 1 ', 15000); INSERT

Flash back deleted table:To delete a table:drop table AA;drop table AA purge; Does not go through the Recycle Bin and cannot be flashed backFlash back deleted table syntax:--the so-called flashback means to restore a table in the Recycle

Today we need to count the number of rows for all the tables under the specified user, and then use the Oracle built-in view:Select Table_name,num_rows from dba_tables where owner = ' USERNAME '; or select Table_name,num_rows from

Background: My own machine to do Oracle server, the other machine can ping my machine, but JDBC is not even, and later with Plsql even appear no listening program ....After I reinstalled Oracle yesterday, there was a ora-12541:tns when connecting to

Oracle 12541,12560,00511 no listener, protocol adapter error problem analysis and solutionProblem Description:1. Lsnrctl start, stop, very slow, the emergence of the phenomenon of Dayton; 2. Details of execution lsnrctl are as follows----------------

Guide ] Dual is a virtual table that makes up the syntax rules for SELECT, and Oracle guarantees that there will always be only one record in dual. We can use it to do a lot of things. 　 Dual is a

In an Oracle database, you can use the Wm_concat (column) function to merge fields, and the following is a detailed introduction to the implementation of this feature for your reference.The Oracle Wm_concat (column) function allows us to use it

Oracle cannot directly set the increment of a field, it needs to build a sequence and trigger to realize the self-increment function of the primary key.First, sequence1, build a sequenceThe syntax format for the sequence is: CREATE SEQUENCE name

Oracle forgot user name and password solutionsDescription: Sometimes, the Oracle database password is forgotten, then you have to try all the usual password, you can look down.First, directly through the operating system authentication mode login,

First, Oracle 10g/11g In Oracle 11g, when archive log mode is turned on, the default archive directory is specified for db_recovery_file_dest. This parameter can be specified in Pfile/spfile: db_recovery_file_dest=

The control file is one of the primary files that make up Oracle database, documenting the binary files of the physical structure of the Oracle databases, mainly including the following:Database nameData files and redo log file location

First, the user1. Create userCreate user u password for AA.sql> create user u identified by AA;2. Give permissions to usersThe user is not yet able to connect to the database and must be given some permissions.Sql> Grant create session to

Environment of this article: Oracle databae 12.1.0.2, rhel5.9 x86-64bit[[email protected] orcl]$ pwd/u01/app/oracle/oradata/orcl[[email protected] orcl]$ ls-lrttotal 2386544drwxr-x---2 oracle oinstall 4096 Dec pdbseeddrwxr-x---2 oracle oinstall 4096

Example:A string "11,15,13,17,12", separated by commas, is now sorted into "11,12,13,15,17".Write an implementation method that is recorded for later use:----------------------------------------------------------Export file for user BEN----Created