Oracle觸發器的創建與編譯錯誤，ORA-02289：序列不存在

Question

當我使用PowerDesigner中生成的SQL和Oracle中運行它，它會引發錯誤

警告：觸發創作與編譯錯誤

create trigger "tib_material_classify" before insert 
on "material_classify" for each row 
declare 
    integrity_error exception; 
    errno   integer; 
    errmsg   char(200); 
    dummy   integer; 
    found   boolean; 

begin 
    -- column ""id"" uses sequence material_classify_seq; 
    select material_classify_seq.nextval into :new."id" from dual; 

-- errors handling 
exception 
    when integrity_error then 
     raise_application_error(errno, errmsg); 
end; 

當我發出的甲骨文show errors，它說以下內容：

10/5 PL/SQL：忽略SQL語句 10/12 PL/SQL：ORA-02289：序列不存在

我在做什麼錯？

Answer 1

之前創建您需要創建sequnce Create sequence material_classify_seq start with 1;創建後觸發

Answer 2

錯誤消息表明序列material_classify_seq缺失。你可以用下面的SQL語句創建丟失的序列：

Create Sequence material_classify_seq;