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Update field with other fields data minus one day - Microsoft SQL / MS SQL Server

Hi I really don't know how to go about this in a relational database. There is data thats downloaded from the net everyday. The data includes a opening price of stock. What I need in the database is to update the today's opening price with yesterday's closing price. eg Instrument, Date, Opening price, Closing Price ABI 20021028 <Null> 4499 ABI 20021029 <Null> 4410 The opening price for 20021029 should be 4499 Any ideas Many thanks Chris...

  1. #1

    Default Update field with other fields data minus one day

    Hi

    I really don't know how to go about this in a relational database.

    There is data thats downloaded from the net everyday. The data includes a
    opening price of stock. What I need in the database is to update the today's
    opening price with yesterday's closing price.

    eg
    Instrument, Date, Opening price, Closing Price
    ABI 20021028 <Null> 4499
    ABI 20021029 <Null> 4410

    The opening price for 20021029 should be 4499

    Any ideas
    Many thanks
    Chris


    chris Guest

  2. #2

    Default Re: Update field with other fields data minus one day

    Assuming that there is a Primary Key on (Instrument, date)

    UPDATE myTable
    SET OpeningPrice = (SELECT ClosingPrice FROM MyTable t2
    WHERE t2.date = myTable.date -1 AND t2.Instrument = myTable.Instrument)

    Or if you don't have prices for everyday, get the price for the last day for
    which there is one:
    UPDATE myTable
    SET OpeningPrice = (SELECT TOP 1 ClosingPrice FROM MyTable t2
    WHERE t2.date < myTable.date AND t2.Instrument = myTable.Instrument
    ORDER BY t2.date DESC)

    --
    Jacco Schalkwijk MCDBA, MCSD, MCSE
    Database Administrator
    Eurostop Ltd.


    "chris" <chrisnutcracker.co.za> wrote in message
    news:O57rE#tRDHA.3700tk2msftngp13.phx.gbl...
    > Hi
    >
    > I really don't know how to go about this in a relational database.
    >
    > There is data thats downloaded from the net everyday. The data includes a
    > opening price of stock. What I need in the database is to update the
    today's
    > opening price with yesterday's closing price.
    >
    > eg
    > Instrument, Date, Opening price, Closing Price
    > ABI 20021028 <Null> 4499
    > ABI 20021029 <Null> 4410
    >
    > The opening price for 20021029 should be 4499
    >
    > Any ideas
    > Many thanks
    > Chris
    >
    >

    Jacco Schalkwijk Guest

  3. #3

    Default Re: Update field with other fields data minus one day

    UPDATE StockTable
    SET OpeningPrice = (
    SELECT TOP 1 ClosingPrice
    FROM StockTable S
    WHERE S.Instrument = StockTable.Instrument
    AND S.Date < StockTable.Date
    ORDER BY S.Date DESC)


    "chris" <chrisnutcracker.co.za> wrote in message
    news:O57rE#tRDHA.3700tk2msftngp13.phx.gbl...
    > Hi
    >
    > I really don't know how to go about this in a relational database.
    >
    > There is data thats downloaded from the net everyday. The data includes a
    > opening price of stock. What I need in the database is to update the
    today's
    > opening price with yesterday's closing price.
    >
    > eg
    > Instrument, Date, Opening price, Closing Price
    > ABI 20021028 <Null> 4499
    > ABI 20021029 <Null> 4410
    >
    > The opening price for 20021029 should be 4499
    >
    > Any ideas
    > Many thanks
    > Chris
    >
    >

    Stefan Gustafsson Guest

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