sequence nextval

Sequence meaningThe Oracle database provides a sequence object, provided by the system with its own growing serial number, usually used for the growth of the primary key or ordinal number of the database data records; Nanjing OCM Training Create a syntax format and descriptionCreate Sequencemysequenc--Custom sequence nameIncrement by 1--Set the step value, that i

(32 )); Insert into test1values (myseq. nextval, 'abc '); Insert into test1values (myseq. nextval, 'ddd ); Note: "myseq" indicates the sequence name; "nextval" indicates that the sequence value is added and the value is returned. Currval returns the current value of the

,seq_autoid.nextval from table2 where condition Of course, the above sentence is to insert data in bulk, you can also use values to insert. The point to note here is that the table1.f4 field needs to be a numeric type (number). In this way, the F4 field in your table1 is starting from 1, with a magnitude increment of the value, to achieve the automatic increase function. Of course the range can be defined by itself. Another point is that the sequence

存中Third, how to use the sequenceAfter the sequence is created, you can use the nextval of the sequence to get the next value of the sequence, using Currval to view the current value. First use must use Nextval to produce a value before you can view it using Currval.//序列调用 产生

Tags: order oracle create modify ACL Replace. com Note NoCachesequence : Is an object provided by Oracle that produces a unique numeric value, primarily for use with a single primary key of a table. To Create a sequence : Create sequence seq_name//naming Start with 1//initial value Increment by 1//increment value MinValue 1//minimum value, default, system default MaxValue 999999999999999999//maximum value,

contains 30 pre-allocated serial numbers. Code Demonstration: generate a serial number SQL> CREATE SEQUENCE MYSEQMINVALUE 1Start with 1NOMAXVALUEIncrement by 1NOCYCLECACHE 30/ Sequence created After creating a sequence, you can access the current value and the next value of the sequence through the two "pseudo columns

-- 1. Create a sequence create sequence seq_testincrement by 1 -- add a few start with 1 each time -- count nomaxvalue from 1 -- do not set the maximum value nocycle -- always accumulate, cache without loops 10 -- cache quantity -- 2. directly use the sequence insert into test values (seq_test.nextval, 'Liu bei ', 27); insert into test values (seq_test.nextval, '

,Released int not null,Primary key (id)); Create sequence MovieSeq; Create table Movie (Id int not null,Name VARCHAR2 (60) not null,Released int not null,Primary key (id)); Create sequence MovieSeq; Java code Insert into Movie (id, name, released) VALUES (MovieSeq. NEXTVAL, 'Gladiator', 2000 );Insert into Movie (id, name, released) VALUES (MovieSeq.

. However, sequences can be used anywhere, regardless of their names. NEXTVAL and CURRVAL pseudo Columns • NEXTVAL returns the next available Sequence Value. NEXTVAL returns a unique value each time it is referenced, even for different users. • CURRVAL obtains the current s