问题从游标中选择小时和分钟并将其存储到变量中

Question

我遇到了这个嵌套游标的问题。我应该从两个游标内的时间戳中获取小时和分钟，然后将它们相加并将它们存储到一个变量中，以便我可以在相同的代码中使用它。我使用如下提取函数：

DECLARE
    
    CURSOR cur1 IS
        (SELECT *
        FROM ((Patient P JOIN Presence Pr ON P.idP=Pr.id_PRP)
               JOIN Loc L ON L.idL=Pr.id_PRL) LEFT JOIN Contact C ON
               P.idP=C.id_PR1);
             
    
    CURSOR cur2 IS
            ((SELECT *
             FROM (((Patient P JOIN Visit V ON P.idP=V.id_PV)
                    JOIN Presence Pr ON P.idP=Pr.id_PRP))
             WHERE :NEW.id_VSW = V.idV));
             
    np cur2%ROWTYPE;
    
    st_c1 number;
    et_c1 number;
    st_np number;
    et_np number;
    
BEGIN
    FOR curV IN cur1 
    LOOP
    
        OPEN cur2;
        
        FETCH cur2 INTO np;
       
        SELECT (EXTRACT(HOUR FROM curV.time_Start)+EXTRACT(MINUTE FROM curV.time_Start)) INTO st_c1 FROM DUAL;
        SELECT (EXTRACT(HOUR FROM curV.time_End)+EXTRACT(MINUTE FROM curV.time_End)) INTO et_c1 FROM DUAL;
        SELECT (EXTRACT(HOUR FROM np.time_Start)+EXTRACT(MINUTE FROM np.time_Start)) INTO st_np FROM DUAL;
        SELECT (EXTRACT(HOUR FROM np.time_End)+EXTRACT(MINUTE FROM np.time_End)) INTO et_np FROM DUAL;
        
        IF (((st_cl <= et_np AND st_cl >= st_np) OR (st_np <= et_cl AND st_np >= st_c1))
            ...
        END IF;
        CLOSE cur2;
        END LOOP;
END;
/

time_Start 和 time_End 属性是这样的：

INSERT INTO Table VALUES(TO_TIMESTAMP('2021-02-22 13:00','YYYY-MM-DD HH24:MI'));

它给了我这个错误：

36/3      PL/SQL: Statement ignored
36/40     PLS-00201: identifier 'ST_CL' must be declared

有什么问题？谢谢。

Answer 1

不是ST_CL，而是ST_C1（第一名）——至少，你是这么声明的。