What is the difference between a row, record and tuple? [closed]

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Closed 7 years ago.

I am studying in a database development course at the moment and I am having trouble getting my head this!

My course notes describe a tuple as: A tuple is a row of a relation

From what I have understood since working with MySQL you search for row(s). Or when browsing through a database you are looking through rows in a table.

And from what I understood a record is information within a row.

Is there any distinct differences between the three?

I know someone has posted something similar but I couldn't really understand his answer.

Thanks for all help in advnce!

Peter

回答1:

In your context they are different words to mean exactly the same thing.

A tuple, in general, means an ordered list with possibly repeated elements (as contrasted to a set, which has all unique elements and is not ordered)

回答2:

They are the same.

A row—also called a record or tuple—represents a single, implicitly structured data item in a table.

回答3:

They mean exactly same thing: tuple, rows or records.

Your SELECT query will generate results that may contain 0 or more rows/records or tuples. A SELECT query can span 1 or more tables

来源：https://stackoverflow.com/questions/13057663/what-is-the-difference-between-a-row-record-and-tuple