Opret et UNIKT indeks, der spænder over disse to kolonner
CREATE
UNIQUE INDEX currency_date
ON yourTableName (CurrencyAbbreviation, DateOfCurrencyRate)
Opret et UNIKT indeks, der spænder over disse to kolonner
CREATE
UNIQUE INDEX currency_date
ON yourTableName (CurrencyAbbreviation, DateOfCurrencyRate)