db2 sequence object

. Sequence object When I first announced sequence objects, I thought they only added another feature to DB2 to port applications from other databases to DB2. But

Two ways to generate a sequence of numbersIn DB2, you can automatically generate a sequence of numbers in two ways: Define a column with an IDENTITY attribute. Creates a SEQUENCE object. IDENTITY Column When you define a table's column with the IDENTITY property, a value is

follows: -- Oracle The Code is as follows: Copy code SELECT seq_test.CURRVAL from dual; -- Current ValueSELECT seq_test.NEXTVAL from dual; -- next value -- DB2 The Code is as follows: Copy code Values prevval for "seq_test"; -- Current ValueValues nextval for "seq_test"; -- next value-- OrValues previous value for "seq_test"; -- Current VALUEValues next value for "seq_test"; -- NEXT VALUE

DB2 view, sequence, constraints, foreign key exercise test. Simple test View of DB2 views, sequences, constraints, and foreign keys: the db2createviewmyview1asselect * fromt1whereempnoDB20000ISQL command is successfully completed. Db2select * from DB2 view, sequence, constra

. Nextval from DUAL; --Next value --DB2 The code is as follows Copy Code VALUES prevval for "seq_test"; --Current valueVALUES nextval for "seq_test"; --Next value--orVALUES PREVIOUS VALUE for "seq_test"; --Current valueVALUES NEXT VALUE for "seq_test"; --Next value --PostgreSQL The code is as follows Copy Code SELECT Currval (seq_test); --Current valueSELECT Nextval (seq_tes

DB2 view, sequence, constraints, foreign key exercise testSimple View:Db2 => create view myview1 as select * from t1 where empno The DB20000I SQL command is successfully completed.Db2 => select * from myview1EMPNO NAME SEQNO--------------------------------10 wan qi 130 xu xin 350 bbbb 6Three records are selected.Simple SequenceDb2 => create sequence myseq start w

You can use DB2 sequence to automatically generate a primary key. The following describes how to use DB2 sequence to automatically generate a primary key. If you are interested in this, take a look. Write a tracing program to record the operations performed on the data. It is assumed that Access has an automatic number

Whether the creation of a new sequence DB2 sequence in DB2 and Oracle contains double quotation marks causes a production system problem www.2cto.com create sequence x3; -- run successfully create sequence "x3" -- run successfully

1. sequence definitionORACLE: Create sequence Increment by Start with Maxvalue Minvalue Cycle/nocycle Cache Order/noorder;DB2: Create sequence As data-type default as integerStart with Increment by Minvalue Maxvalue No cycle | no cycle by defaultCache No order | order no order by default 2.

MySQL. Thus, once the ID is set to the identity type, the MS SQL Server database automatically assigns a value to the primary key in an incremental manner. The identity contains two parameters, the first parameter represents the starting value, and the second parameter represents the increment.In DB2, if the primary key of the table is set to:UserID integer NOT NULL generated always as identity (start with 1,increment by 1),2. Get an auto-growing ide

Migration of DB2 database sequence 1. generate the following statement to obtain the current value of the source database sequence: www.2cto.com SQL code SELECT 'select' CREATE SEQUENCE '| seqname | 'start WITH ''' |' | seqname | '. nextval from sysibm. sysdummy1' FROM syscat. sequences WHERE seqtype ='s AND seqschema

Definition and use of sequence in DB2 -- Method 1 (self-used, green, secure, and pollution-free): Create a sequence named SEQ_LDBG, auto-increment 1, create sequence SEQ_LDBG as int start with 1 increment by 1 MINVALUE 1 no maxvalue no cycle no cache order; -- use nextval for SEQ_LDBG in SQL, codechange7 is the table n

C #Object initialization 1.Variable first and then constructor. The variable is initialized first.,Then the constructor is executed. 2.First static and then instantiated. When a class is accessed,Static variables and constructors are first initialized.Then, the object's instantiated variables and constructors are initialized. 3. First, the derived class and then the base class. For variables and static Constructors , The derived

URL: http://www.ibm.com/developerworks/cn/data/library/techarticles/0302fielding/0302fielding.html Although both identifiers and sequences are used to generate values, you may need to use one instead of the other according to special circumstances. The identification column is useful in the following situations: The table has only one column of values to be automatically generated. Each row must have an independent value. Use an Automatic Generator to generate the table's primary key

Label:Reprint Link: http://www.cnblogs.com/zhangyoushugz/archive/2012/11/09/2762720.html As 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 the sequence in a table, when we encounter the following situations, Table 1 Id Order type Price 1 Train t

************************************************************************* * * * Original:blog.csdn.net/clark_xu Xu Changliang's Column************************************************************************Sequence:Oracle can generate primary keys by sequence1. Create a sequenceCREATE TABLE Foo (foo_id Number (11),Foo_value VARCHAR2 (50),Constraint FOO_PK primary KEY (FOO_ID))Creating a sequence DDLCreate sequenc