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Subject: Re: Liðir eitt og tvö í heimadæmum 11


Author:
Hjálmtýr
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Date Posted: 22:27:50 02/Dec/2007
In reply to: 's message, "Liðir eitt og tvö í heimadæmum 11" on 23:28:33 28/Nov/2007
 >Ég var að velta því fyrir mér hvers lags fyrirspyrnir
>séu leyfilegar í liðum 1 og 2 í heimadæmum 11. T.d. í
>where hluta fyrirspurnarinnar má þá gera
>
>WHERE gender='Male'
>
>eða eitthvað álíka? Mér er það samt ljóst að við megum
>aðeins gera
>
>SELECT SUM(sid) FROM Sailors
>
>en ekki
>
>SELECT sid FROM SAILORS
>

Það má hafa hvað sem er í WHERE-hlutanum, en það má síðan aðeins nota hópunar-aðgerðir (aggregates) í SELECT-hluta.
Svo má ekki vera vera bara einn bakvið fyrirspurn í dæmi 2.
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Re: Liðir eitt og tvö í heimadæmum 11Birgir12:22:11 03/Dec/2007

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