I need a function, it can return columns's Product, just like the Sum function in Oracle, does any expert help me?
SELECT
Price.Date, Price.Price / Product(Split.Ratio)
FROM
Price, Split
WHERE
Price.Date = Split.Date
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Great!
That is what I am looking for, thought the method of aggregate might be more useful in general.
By the way, my real SQL as below, is it possible to more simple?
SELECT b.date1, FLOOR(c.price / FLOOR(b.ratio)) Price
FROM (SELECT date1, EXP(SUM(LN(ratio) Ratio
FROM (SELECT Price.date1, NVL(Split.ratio,1) Ratio
FROM Price, Split
WHERE Price.date1 = Split.date1(+)
ORDER BY Price.date1 DESC) a
GROUP BY date1
ORDER BY date1 DESC) b, Price c
WHERE b.date1 = c.date1
Business Accounts
Answer for Membership
by: sdstuberPosted on 2008-02-20 at 21:17:50ID: 20945175
You can only do this in 9i or above. You are looking for something called a "user defined aggregate"
CREATE OR REPLACE TYPE PRODUCT_TYPE AS OBJECT(
total NUMBER,
STATIC FUNCTION odciaggregateinitialize(sc
RETURN NUMBER,
MEMBER FUNCTION odciaggregateiterate(
SELF IN OUT product_type,
VALUE IN NUMBER
)
RETURN NUMBER,
MEMBER FUNCTION odciaggregateterminate(
SELF IN product_type,
returnvalue OUT NUMBER,
flags IN NUMBER
)
RETURN NUMBER,
MEMBER FUNCTION odciaggregatemerge(
SELF IN OUT product_type,
ctx2 IN product_type
)
RETURN NUMBER
);
/
CREATE OR REPLACE TYPE BODY product_type
IS
STATIC FUNCTION odciaggregateinitialize(sc
RETURN NUMBER
IS
BEGIN
sctx := product_type(NULL);
RETURN odciconst.success;
END;
MEMBER FUNCTION odciaggregateiterate(
SELF IN OUT product_type,
VALUE IN NUMBER
)
RETURN NUMBER
IS
BEGIN
SELF.total := NVL(SELF.total, 1) * VALUE;
RETURN odciconst.success;
END;
MEMBER FUNCTION odciaggregateterminate(
SELF IN product_type,
returnvalue OUT NUMBER,
flags IN NUMBER
)
RETURN NUMBER
IS
BEGIN
returnvalue := SELF.total;
RETURN odciconst.success;
END;
MEMBER FUNCTION odciaggregatemerge(
SELF IN OUT product_type,
ctx2 IN product_type
)
RETURN NUMBER
IS
BEGIN
SELF.total := NVL(SELF.total, 1) * NVL(ctx2.total, 1);
RETURN odciconst.success;
END;
END;
/
CREATE OR REPLACE FUNCTION product(input NUMBER)
RETURN NUMBER PARALLEL_ENABLE AGGREGATE
USING product_type;
/