Why are certain fields chosen to be the primary key in a database?
A Primary key is a field in a database that is used as an unique identifier for each record. Therefore the field that is chosen as the primary key has to be something that will be different for every record, for example the ISBN of a book or a customer ID number.
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Related Computing GCSE answers
All answers ▸Convert 01010001 from binary to decimal
What is an Algorithm?
Assuming Two's complement convert 10010110 to decimal.
In terms of programming software, what is a translator? Describe the differences between the following three translators: assembler, compiler, interpreter.