Next value function error

问题

I get the following error during postgresql execution: ERROR [HY000] ERROR: you can only use a 'next value(s)' function within a target list

What is wrong with this sql statement:

SELECT TRFCON.ID       
       ,   
       case when DDDCON.ID_CON = 0
       then
        NEXT VALUE FOR SEQ_DDD_CON   
        else
       DWHCON.ID_CON
       end ID_CON

  FROM TTT_CONSUMPTION TTTCON 

join DDDDWH_CON DWHCON on TTTCON.ID_ORG = DDDCON.ID_ORG
and TTTCON.ID_PRO = DDDCON.ID_PRO
and TTTCON.ID_REF = DDDCON.ID_REF

The DDL of the sequence is the following:

CREATE SEQUENCE SEQ_DDD_CON AS BIGINT
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE 
    NO MAXVALUE 
    NO CYCLE;

回答1:

From the docs for CREATE SEQUENCE

Compatibility

CREATE SEQUENCE conforms to the SQL standard, with the following exceptions:

• [...]
• Obtaining the next value is done using the nextval() function instead of the standard's NEXT VALUE FOR expression.

来源：https://stackoverflow.com/questions/17829458/next-value-function-error