這個程序有什麼問題？

Question

我在寫一個小程序。我有一個名爲c1的光標，以及這樣聲明的變量v_c1：v_c1 c1%ROWTYPE。光標被取入它。

然而，問題是從遊標提取的值不是數字。我很困惑，因爲它是表中的一個數字，它在打印時看起來像一個數字。這是程序。

create or replace 
PROCEDURE mini 
IS 
    CURSOR c1 
    IS 
    SELECT * FROM utslipp; 

    v_c1 c1%ROWTYPE; 
    v_co2_utslipp NUMBER; 
    v_kildenavn VARCHAR2(200); 
    v_temp NUMBER; 

BEGIN 
    OPEN c1; 
    FETCH c1 INTO v_c1; 
    v_co2_utslipp := v_c1.co2_utslipp; 
    v_co2_utslipp := v_c1.co2_utslipp; 

    LOOP 
    FETCH c1 INTO v_c1; 
    EXIT WHEN c1%NOTFOUND; 

    v_temp := v_c1.co2_utslipp; 

    IF v_temp < v_co2_utslipp THEN 
     v_co2_utslipp := v_c1.co2_utslipp; 
     v_kildenavn := v_c1.kildenavn; 

    -- According to SQL Developer the error is here. 
    ELSIF v_temp = v_co2_utslipp THEN 

     -- ...When the actual error is here.  
     v_co2_utslipp := v_co2_utslipp || ', ' || v_c1.co2_utslipp; 
     v_kildenavn := v_kildenavn || v_c1.kildenavn; 
    END IF;  
    END LOOP; 

    DBMS_OUTPUT.PUT_LINE(v_kildenavn || ', ' || v_co2_utslipp); 
END; 

更新：下面是腳本：

alter table utslipp 
drop primary key cascade ; 
alter table produkt 
drop primary key cascade ; 
alter table fylke 
drop primary key cascade ; 
alter table eieren 
drop primary key cascade ; 
drop table utslipp ; 
drop table produkt ; 
drop table fylke ; 
drop table eieren ; 



create table produkt 
(
    pid number(2) primary key, 
    produktnavn varchar2(20) 
) ; 

create table fylke 
(
fid number(2) primary key , 
fylkesnavn varchar2(20) 
) ; 

create table eieren 
(
eid number(2) primary key, 
eiernavn varchar2(20) 
) ; 

create table utslipp 
(
    kid number(2) , 
    kildenavn varchar2(20), 
    eid number(2), 
    pid number(2), 
    fid number(2), 
    aar number(4), 
    co2_utslipp number(4), 
    constraint utslipp_pk primary key(kid,aar) , 
    constraint eieren_fk 
    FOREIGN KEY (eid) 
    REFERENCES eieren, 
    constraint produkt_fk 
    FOREIGN KEY (pid) 
    REFERENCES produkt, 
    constraint fylke_fk 
    FOREIGN KEY (fid) 
    REFERENCES fylke 
) ; 

insert into eieren values(1,'Statoil'); 
insert into eieren values(2,'Hydro'); 
insert into eieren values(3,'Yara'); 
insert into eieren values(4,'Esso'); 
insert into eieren values(5,'Norcem') ; 
insert into eieren values(6,'Alcoa') ; 
insert into eieren values(7,'Eramet') ; 
insert into eieren values(8,'Gassco') ; 
insert into eieren values(9,'Philips') ; 
insert into eieren values(10, 'Noretyl') ; 

insert into produkt values(1,'Olje'); 
insert into produkt values(2,'Naturgass'); 
insert into produkt values(3,'Aluminium'); 
insert into produkt values(4,'Kunstgjødsel'); 
insert into produkt values(5,'Etylen'); 
insert into produkt values(6,'Stål'); 
insert into produkt values(7,'Bensin'); 
insert into produkt values(8,'Sement') ; 

insert into fylke values(1, 'Finm') ; 
insert into fylke values(2, 'Troms') ; 
insert into fylke values(3, 'Nordland') ; 
insert into fylke values(4, 'Nord-Trøndelag') ; 
insert into fylke values(5, 'Sør-Trøndelag') ; 
insert into fylke values(6, 'Møre-Romsdag') ; 
insert into fylke values(7, 'Sogn-Fjordane') ; 
insert into fylke values(8, 'Hordaland') ; 
insert into fylke values(9, 'Rogaland') ; 
insert into fylke values(10, 'Vest-Agder') ; 
insert into fylke values(11, 'Aust-Agder') ; 
insert into fylke values(12, 'Telemark') ; 
insert into fylke values(13, 'Vestfold') ; 
insert into fylke values(14, 'Buskrud') ; 
insert into fylke values(15, 'Akershus') ; 
insert into fylke values(16, 'Oslo') ; 
insert into fylke values(17, 'Østfold') ; 
insert into fylke values(18, 'Oppland') ; 
insert into fylke values(19, 'Hedmark') ; 
insert into fylke values(20, 'Offshore') ; 

insert into utslipp values(1,'Snøhvit',1,1,1,2009,805); 
insert into utslipp values(2,'Kjøpsvik',5,8,3,2009,409); 
insert into utslipp values(3,'Mosjøen',6,3,3,2009,312); 
insert into utslipp values(4,'Heidrun',1,1,20,2009,410); 
insert into utslipp values(5,'Åsgard',1,1,20,2009,1041); 
insert into utslipp values(6,'Tjeldbergodden',1,3,5,2009,315); 
insert into utslipp values(7,'Sunndal',2,3,6,2009,528); 
insert into utslipp values(8,'Snorre',1,1,20,2009,585); 
insert into utslipp values(9,'Statfjord',1,1,20,2009,576); 
insert into utslipp values(10,'Gullfaks',1,1,20,2009,979); 
insert into utslipp values(11,'Troll',1,2,20,2009,625); 
insert into utslipp values(12,'Mongstad',1,2,7,2009,1549); 
insert into utslipp values(13,'Oseberg',1,1,20,2009,1143); 
insert into utslipp values(14,'Odda',7,8,8,2009,328); 
insert into utslipp values(15,'Karmøy',2,3,9,2009,317); 
insert into utslipp values(16,'Kollsnes',8,2,9,2009,1129); 
insert into utslipp values(17,'Sleipner',1,1,20,2009,865); 
insert into utslipp values(18,'Ekkofisk',9,1,20,2009,1023); 
insert into utslipp values(19,'Porsgrunn',3,4,12,2009,629); 
insert into utslipp values(20,'Brevik',5,8,12,2009,825); 
insert into utslipp values(21,'Bamble',10,5,12,2009,459); 

-- Here is the newest insert. 
INSERT INTO utslipp VALUES(2, 'foobar', 3, 1, 2, 2008, 312);  
insert into utslipp values(1,'Snøhvit',1,1,1,2008,1300); 
insert into utslipp values(1,'Snøhvit',1,1,1,2007,1600); 

對不起，它的長度，但我不希望刪除任何可能影響結果。

我在這裏做錯了什麼？

Answer 1

問題不在於比較數字時。它在下一行 - 您嘗試將包含逗號（，）的字符串分配給數字變量v_co2_utslipp。

你完全誤導錯了我的「錯誤」行:(。