increment by

The use of views and sequences in Oracle:ViewViews are obtained by querying one or more table definitions, and the table on which the view is defined is referred to as the base table, and the simple point is that the view unites one or more tables

Reprint Link: http://www.cnblogs.com/zhangyoushugz/archive/2012/11/09/2762720.htmlAs we all know, in the previous version of SQL Server, the GUID or identity is generally used as the identifier, but the identity is a table object, can only guarantee

This article contains the following content:1. Oracle PL/SQL usage2.5 Constraints in Oracle (non-NULL constraints, UNIQUE constraints, PRIMARY KEY constraints, FOREIGN KEY constraints, check constraints)3, Oracle single quotation mark, double

Blogging is a good thing to keep a record of some commonly used SQL.Querying all user information in OracleSELECT * from Dba_users;Querying users and Passwords onlySelect Username,password from Dba_users;Querying Current User InformationSELECT *

http://blog.csdn.net/zhoufoxcn/article/details/1762351 first assume that there is a table:CREATE TABLE S_depart (Departid INT NOT NULL,Departname NVARCHAR2 (+) NOT NULL,Departorder INT Default 0,Constraint Pk_s_depart primary KEY (Departid));In

Oracle Two optimization modesThe WHERE clause in 1.CBO CBO mode has no effect on query speed2.rbo will perform the index first under Rbo.OLTP online transaction processing refers to systems that frequently change data.OLAP table Data Analysis Index

Auto Grow FieldWhen designing a database, it is sometimes necessary to automatically grow a field of a table, the primary key of the table is the most common use of the autogrow field, and the auto-grow field can simplify the generation of the

SQL CREATE INDEX statementThe CREATE INDEX statement is used for creating indexes in the table.Indexes enable database applications to find data faster without reading the entire table.Users cannot see the index, they can only be used to speed up

How does Oracle achieve primary key self-growth by using the Auto_increment property after the field definition in MySQL for self-growth? Build table: Create table users (  userid number)  not null,  username  VARCHAR2 ()

1, about the primary key: the construction of the table when the specified primary key words can:CREATE TABLE Test ( ID Number (6) primary key,Name VARCHAR2 (30));If you want to increase the primary KEY constraint for a table that has already been

Other databases such as MySQL have the ability to automatically grow the table ID as the record is inserted, and Oracle does not have this capability, and we have the following two ways to solve the self-growing function of the field.Because both of

Program development times wrong: Trigger ' SA. U_USER_INFO_TRG ' is invalid and has not been re-verifiedOpens the definition of the trigger, executes the statement within it, and discovers that the sequence u_user_info_seq is undefined.What is a

First, we'll build a test table by Sql/plus.SQL statements:Cteate TABLE TEST (ID number,NAME VARCHAR2 (20),PRIMARY KEY (ID)）;Create a sequence by sql/plusSQL statements:CREATE SEQUENCE Seq_testINCREMENT by 1START with 1MINVALUE 1MAXVALUE 9999Nocycle;

In an Oracle database, sequence is equivalent to a serial number, and the sequence is automatically incremented each time it is taken, and is typically used in places that need to be sorted by serial number.1. Create Sequence(Note: You need to have

This article is a common database of the self-add field to create a comprehensive summary of the introduction, the need for friends to refer to the DB2 Copy Code code as follows: CREATE TABLE T1 ( ID INTEGER not NULL generated ALWAYS as

In this case, the automatic growth column refers to the automatic growth of the primary key ID in a table. Unlike MySQL, Oracle cannot set the automatic Growth column feature when create tables. Oracle must create a sequence sequence to automate

ORACLE Sequence Usage Sequence in Oracle is the serial number, which automatically increases each time it is fetched. Sequence is not related to the table. 1, create Sequence first to have create Sequence or create any Sequence permissions. The

Sequence --create sequence Create sequence empseq increment by the start with MaxValue Cycle Nocache--needn ' t cache --query sequence Select Sequence_name,min_value,max_value,increment_by,last_ Number from user_sequences- -Find Next

1, the creation and description of the sequence To create a sequence, the syntax format for the Oracle sequence is:CREATE SEQUENCE sequence Name[INCREMENT by N][START with N][{Maxvalue/minvalue n| Nomaxvalue}][{cycle| Nocycle}][{CACHE n| NoCache}]; 1

Oracle sequence detailing and creating a self-added primary key Oracle Sequence PRIMARY KeySequence: A database object provided by Oacle to produce a series of unique digits.L provide a unique numeric value automaticallyL Shared objectsL primarily