환율은 테이블에 저장되며 최신 환율로 일주일에 몇 번 업데이트됩니다. 판매 주문서에 날짜를 기입하고 주문 당시 활성 상태였던 환율을 할당하려고합니다. 아래는 환율 및 유효 일자, 판매 주문 목록, 효과 비율 (주문 시간당 Exchage rate, 내가 원하는 것)입니다.MAX 날짜 <= 다른 테이블의 날짜
currate.effectivedate currate.currentrate
12/2/2012 0.55
12/7/2012 0.52
12/13/2012 0.54
12/19/2012 0.53
12/22/2012 0.56
orderhed.orderdate orderhed.ordernum Exchage Rate @ date of order
12/4/2012 105 0.55
12/8/2012 111 0.52
12/9/2012 116 0.52
12/19/2012 120 0.53
12/28/2012 123 0.56
다음과 같은 예가 있습니다.하지만 작동하지 않습니다. 첫째, currate.effectivedate의 MAX 기능 때문에 currate.currentrate 필드를 가져 오는 방법을 생각할 수 없습니다. 그런 다음 t_rate.effectivedate에 대해 최대 기간이 < = orderhed.orderdate가 아닌 테이블 기간의 환율의 최대 일을 얻고 있습니다. order의 유효 기간 (및 해당 currentrate.currentrate)을 얻으려면 orderhed.orderdate보다 작거나 같은 MAX currate.effectivedate가 필요합니다. 내가 나 자신을 되풀이하거나 미안하다면 미안하다. 아래의 슬픈 질문에 분명하지 않다면 필자는 쿼리를 작성하는 데있어 극히 익숙하므로 어떤 도움을받을 수 있는지 크게 알고 있습니다.
SELECT
orderhed.ordernum,
orderhed.orderdate,
orderdtl.orderline,
orderdtl.unitprice,
orderdtl.docunitprice,
orderdtl.discount,
orderdtl.docdiscount,
t_rate.effectivedate
FROM orderhed LEFT OUTER JOIN
(SELECT rate1.company, MAX(rate1.effectivedate) AS effectivedate, order1.orderdate
FROM currrate as rate1 INNER JOIN
orderhed AS order1 ON rate1.company = order1.company
WHERE (rate1.company = 'lotcol') AND (rate1.currencycode = 'usd')
GROUP BY rate1.company, order1.orderdate)
AS t_rate ON orderhed.company = t_rate.company AND t_rate.orderdate <= orderhed.orderdate
INNER JOIN
orderdtl ON orderhed.company = orderdtl.company
WHERE (orderhed.company = 'lotcol')
업데이트 --- 당신이 올바른 방향으로 날을 슬쩍 찔렀다 무엇 대답 @LastCoder
감사합니다. 하루의 끝에서,이 일을 정확히 :
는SELECT orderhed.ordernum, orderhed.orderdate, orderdtl.orderline, orderdtl.unitprice, orderdtl.docunitprice, orderdtl.discount, orderdtl.docdiscount, t_rate.effectivedate,
t_rate.ordernum AS Expr1, t_rate1.currentrate
FROM orderhed INNER JOIN
(SELECT rate1.company, MAX(rate1.effectivedate) AS effectivedate, order1.orderdate, order1.ordernum
FROM currrate AS rate1 INNER JOIN
orderhed AS order1 ON rate1.company = order1.company AND rate1.effectivedate <= order1.orderdate
WHERE (rate1.company = 'lotcol') AND (rate1.currencycode = 'usd')
GROUP BY rate1.company, order1.orderdate, order1.ordernum) AS t_rate ON orderhed.ordernum = t_rate.ordernum AND orderhed.company = t_rate.company AND
t_rate.orderdate <= orderhed.orderdate INNER JOIN
(SELECT company, currencycode, effectivedate, currentrate
FROM currrate AS currrate_1
WHERE (company = 'lotcol') AND (currencycode = 'usd')) AS t_rate1 ON t_rate.company = t_rate1.company AND
t_rate.effectivedate = t_rate1.effectivedate INNER JOIN
orderdtl ON orderhed.company = orderdtl.company AND orderhed.ordernum = orderdtl.ordernum
WHERE (orderhed.company = 'lotcol')
ORDER BY orderhed.ordernum