sequence currval

Oracle sequence parameters: nextval and currval. Nextval returns the next avaiable sequence value. it returns a unique value every time it is referenced, even for different users. currval obtains the current sequence value. open the first session

ORA-08002: sequence SEQ_WGB_TEST2.CURRVAL not defined in this session ORA-08002: sequence SEQ_WGB_TEST2.CURRVAL not defined in this session Environment Oracle 11.2.0 + SQL Plus Problem The following error occurs when querying the current

When I used to write SQL, I always worried that the value of current () would not be absolutely equal to the value I got last time Nextval ().Nextval () can be accessed concurrently by other threads.Let's start with the conclusion:When you get a

Two parameters of the Oracle sequence: Nextval and CurrvalI will use one of the following examples to reflect the difference between the two parametersTo create a sequence:Note: Before calling the value of Currval, you must first call the value of

Application of nextVal and currVal in the database., nextvalcurrval X. nextVal gets the next sequence value of x sequence, and x. currVal gets the current sequence value of x sequence. Note:X.CurrVal must be referenced beforeX. NextVal; otherwise, a

Sequence is a sequence of numbers automatically added by a database system in accordance with certain rules. This sequence is generally used as the surrogate primary key (because it is not duplicated) and has no other meaning.Sequence is the

Http://database.51cto.com/art/201108/280742.htm In the Oracle database , what is a sequence ? What it is used for. A sequence (SEQUENCE) is actually a serial number generator that can automatically generate serial numbers for rows in a table,

In an Oracle database, the purpose of a sequence is to generate a table's primary key value, to be referenced in an INSERT statement, to check the current value through a query, or to increment the sequence to the next value. In this article we

What does Sequence mean?SQL> select * from v $ version where rownum = 1;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-Production the following is an

X.nextval gets the next sequence value of the x sequence, X.currval gets the current sequence value of the x sequence.Note: In reference to X. You must first refer to xbefore currval . Nextval, otherwise the ORA-08002 is reported: The sequence