Oracle

Oracle 12c if installed by the default process, there will be a CDB container called ORCL and a PDB container called PDBORCLDFirst, a CDB container named ORCL is connected.Connection Name: LOCALORCLUser name: SYSPassword: Oracle12csysConnection type:

Oracle cascading deletes can be implemented using triggers, but the simplest is to directly establish the primary foreign key relationship of the table and set the cascade Delete for the column.------created the class table and set the ID field as

SQL Server and Oracle Modify table structures are commonly usedSQL Server:1. Add columnsALTER TABLE users ADD address varchar (30);2. Delete ColumnsALTER TABLE users DROP COLUMN address;3. Modify the field typeAlter TABLE users ALTER COLUMN address

implementing a row merge using Wmsys.wm_concatIn Oracle, multiple rows of data from one field are converted to a comma-style line display, which can be achieved using the function Wmsys.wm_concat.This one in the previous articleOracle Built-in

1. QuestionsPlsql has only 32-bit programs so far, and most desktop systems are basically using 64-bit Windows operating system, on 64-bit Windows, in most cases also installs the 64-bit Oracle client program, this combination causes Plsql to not

Let's start by talking about the two basic concepts of a database: Instance (Oracle Instance): an instance is a collection of Oracle background processes (referred to as UNIX systems)/threads (Windows systems) and a shared memory area

Two date Type fields: Start_date,end_date, which calculates the time difference between these two dates (in days, hours, minutes, seconds, milliseconds, respectively):Days:ROUND (To_number (end_date-start_date))Hours:ROUND (To_number (end_date-start_

Table synchronization can be implemented using materialized views, can be the same library or can be different databases for data synchronization, it is recommended that data synchronization in the same library can use real-time synchronization, if

Recently found a lot of people asked how to access other people on the machine Oracle, here to give you a demonstrationWith tools, Oracle takes two of its ownConfigure and Move value assistant below: NET Configuration Assistant and Net ManagerA. NET

Statements for Oracle data fuzzy queries:SELECT m.musicid,m.musicname,m.musicpicture,m.musiclyrics,m.musicinstruction from MUSIC m where m.musicname like '% see% ' ;Originally, I was going to implement a fuzzy query based on the keywords I entered,

Used to log in to the Oracle database and execute SQL statements, using Sqlplus today do not know how to login, landing on the unexpectedly do not know how to view all the tables.Login: sqlplus test/123456@192. 168.0. :1521/orcl After landing want

Because of the need to rebuild em, rebuilding because some errors were forced to stop, such as the object exists, the user already exists, and finally found the necessary conditions to create;1. Environment variables (Oracle and grid are installed

The acid Characteristics of Oracle Transactions1 , Atomic (atomicity)The atomicity of a transaction means that all the operations contained in a transaction are either done or not, ensuring that the database is consistent.For example: A account to

directly on the sourceOne, Oracle storage process.Create or replace procedure proc_get_th (I_hth in Varchar2,O_ret out Sys_refcursor)IsBeginFor V_rec in (select ggd_id,th from Gms_ggd_zt where hth=i_hth)LoopInsert into tmp_gms_plan_th

oracle11g default to Empty table is not assigned segment, so when using exp export oracle11g database, empty table will not export! 1, set the deferred_segment_creation parameter to false, whether it is an empty table or a non-controlled table,

(select Bg.sysyear,bg.orgontid,bg.orgname,bg.accvouchercode,bg.accvouchername, "as Accvoucherpropfrom Gzyt_ Middle.beginningbalance bgwhere bg.ledger = ' Ag.sysyear,ag.orgontid ' and bg.sysyear = ') ' Union ALL (select

/** * * Create a user and specify which table to start with * * * **/--1. Create a user and set the default table spaceCREATE USERChengdwy identified byChengdwyDEFAULTTablespace CFWL QUOTA UNLIMITED onCFWL;--drop user Chengdwy CASCADE;--delete users-

Character Set, National Character Set, and NLS_LANG Runtime Library -- Unicode encoding scheme-- Three implementation standards: UTF-8, usc-2, UTF-16-- Oracle Database Character Set-- Character set-- National character set-- Character Set main

Oracle rac does not support rhel5.x and rhel6.x Oracle rac does not support rhel5.x and rhel6.x Because rhel5.x and rhel 6.x appear in oracle as "different operating system versions" The answer from oracle's sr engineers is as follows: There shouldn'

Duplicate sid installation in oracle After Oracle is uninstalled, it is installed again. If the configured SID is the same, "the specified SID already exists on the local machine. Please specify a different SID ." SID Introduction The SID, also