Oracle

Grammar:SELECT ... From + table name START With + condition 1CONNECT  by PRIOR + conditions 2WHERE + condition 3DescriptionThis method is used to query the data of the tree structure. For example, we have a structure like thisThen build a table

Basic use of SELECT statementsYou can query the required columns, rows, multi-link tables, connection queries.Select E.*, e.sal/ from P_emp EThe select is followed by the result to be displayed, which can be a pseudo-column derived from an operation

Use of Oracle KeywordsUse Insert to add data: INSERT into table name VALUES (add corresponding number); COMMIT;INSERT into P_empVALUES (' TOM2 ', ' clerk ', 7902, Sysdate,, NULL, 30);COMMIT;Try delete Delete a data: Delete table name WHERE condition;

A project requires a view to build a primary key, here is a sampleCREATE or replace VIEW sme_v_a .... (Agentid,agentname,busynum,restnum,resttime,devicenonum,devicenosum,CONSTRAINT agentstatic_pk PRIMARY KEY (agentid) RELY DISABLE

Data Base Oracle Common commands1. Login: (no password required, administrator rights)Conn/as SYSDBA2. View the database storage location:Select name from v$datafile; 3. Create TABLE spaces:Syntax:create tablespace tablespace name datafile ' data

The deadlock is due to the fact that two objects request another resource with one resource,Another resource happens to be holding the two objects, causing the two objects to be unable to complete the operation, and the resources held cannot be

Pro-Test availableIn Oracle database operations, we sometimes use lock table queries and operations such as unlocking and kill processes, so how are these operations implemented? In this paper, we mainly introduce this part of the content.(1) The

One, based on differential backup1. Prepare the Oracle Environment for DBA work, with the following details:1.1. Install the same version of Oracle software1.2, configuration good pfile or from the current network copy SPFile1.3, configure the

Oracle The version is very many, first look at a version of the 11g description:Attention: after the Oracle 9.2 version number, Oracle's maintenance release numbers are changed at the second digit bit. And before that is in the third digit digit.1.

Oracle Database IndexIn a relational database, an index is a database structure that is related to a table, which enables the SQL statements that correspond to tables to execute faster. The index acts as a catalog of books, and you can quickly find

1. CREATE TABLE Space Data_basic(1) Orale User Login System(2) Sqlplus/as sysdba; DBA User Login database;Execution: Create tablespace tab_sts_basic datafile '/oracle/app/uboss/oradata/uboss/datafile/uboss_def01.dbf' Size 512M; --The path should be

Architecture:Instance: ExampleDatabase: DatabasesRAC: Multi-instance to one databaseSGA: Maximum total (System global Zone) buffersPGA: One of these is also a bufferServer process: Servers processesShared pool: Share value (execution plan for

/*Example 1*/CREATE OR REPLACE PROCEDUREtest1 is BEGIN NULL; END; begintest1 ();End;/*Example 2*/CREATE OR REPLACE PROCEDURETest2 (P1inchnvarchar2) as BEGINDbms_output.put_line (p1);END; Declaremsg NVARCHAR2 ( -);beginTest2 (P1=

An Oracle database object, also known as a schema object, is a collection of logical structures in which the most basic database object is a table. Common database objects include synonyms, sequences, views, and so on.1. ViewViews can restrict a set

View the lock table process SQL statement 1:Select Sess.sid,sess.serial#,Lo.oracle_username,Lo.os_user_name,Ao.object_name,Lo.locked_modeFrom V$locked_object Lo,Dba_objects AO,V$session Sesswhere ao.object_id = lo.object_id and lo.session_id =

1. Character classesLpad(STR1,LENGTH,STR2)The Lpad function fills the string with the specified character from the left. From its literal meaning can also be understood, L is the left shorthand, pad is the meaning of padding, so the lpad is the

Oracle tablespace Meaning: A tablespace is a logical division of a database, and a table space can belong to only one database. All database objects are stored in the specified table space. But the main storage is the table, so called table

1. View All Users:SELECT * from Dba_users;SELECT * from All_users;SELECT * from User_users;2. View user or role system permissions (System permissions that are directly assigned to a user or role):SELECT * from Dba_sys_privs;SELECT * from

In Oracle, you can use the drop, delete, and truncate three commands to delete a table from a database.1. Delete and truncate both delete the contents of the table and cannot delete the structure of the table, while the drop is to delete the

Typically, the Oracle RAC installation completes the CTSS state exception due to a conflict with the NTP service that comes with the server operating system, so it is recommended that the Oracle RAC installation thoroughly uninstall the NTP-related