尝试将日期返回为星期几的编号值

Question

我试图在我的选择语句中将我的 date_column (dtcreated) 作为编号值返回，这样我就可以显示一周中每一天的总订单数以及它在哪一天（即星期一等） .) 除了它没有返回。有人可以仔细检查我的日期函数代码并告诉我我做错了什么，因为它没有返回。

create or replace function DAY_ORD_SF
(basket_id IN number)
return number

IS

basket_iID  number(5);
basket_dt   date;
num_of_ord  number;
day_of_week number;
week_day    varchar2(10);

cursor bb IS select idbasket, dtcreated from bb_basket where idbasket=basket_id;

BEGIN
    open bb;
    fetch bb into basket_iID, basket_dt;

    SELECT COUNT(BASKET_iID), TO_DATE(BASKET_DT,'D') INTO NUM_OF_ORD, DAY_OF_WEEK FROM BB_BASKET WHERE IDBASKET=BASKET_iID;

    IF DAY_OF_WEEK = 1 THEN
        WEEK_DAY := 'Sunday';
        DBMS_OUTPUT.PUT_LINE('Total Orders for ' || week_day || ' is ' || NUM_OF_ORD || '.' );
    ELSIF DAY_OF_WEEK = 2 THEN
        WEEK_DAY := 'Monday';
        DBMS_OUTPUT.PUT_LINE('Total Orders for ' || WEEK_DAY || ' is ' || NUM_OF_ORD || '.');
    ELSIF DAY_OF_WEEK = 3 THEN
        WEEK_DAY := 'Tuesday';
        DBMS_OUTPUT.PUT_LINE('Total Orders for ' || WEEK_DAY || ' is ' || NUM_OF_ORD || '.');
    ELSIF DAY_OF_WEEK = 4 THEN
        WEEK_DAY := 'Wednesday';
        DBMS_OUTPUT.PUT_LINE('Total Orders for ' || WEEK_DAY || ' is ' || NUM_OF_ORD || '.');
    ELSIF DAY_OF_WEEK = 5 THEN
        WEEK_DAY := 'Thursday';
        DBMS_OUTPUT.PUT_LINE('Total Orders for ' || WEEK_DAY || ' is ' || NUM_OF_ORD || '.');
    ELSIF DAY_OF_WEEK = 6 THEN
        WEEK_DAY := 'Friday';
        DBMS_OUTPUT.PUT_LINE('Total Orders for ' || WEEK_DAY || ' is ' || NUM_OF_ORD || '.');
    ELSIF DAY_OF_WEEK = 7 THEN
        WEEK_DAY := 'Saturday';
        DBMS_OUTPUT.PUT_LINE('Total Orders for ' || WEEK_DAY || ' is ' || NUM_OF_ORD || '.');
    END IF;
END;
/

Answer 1

您的代码中没有 RETURN 语句。你可以试试把

RETURN DAY_OF_WEEK;

就在函数的END; 之前。

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