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| Newer page: | version 2 | Last edited on Wednesday, September 10, 2003 10:52:48 pm | by CraigBox | Revert |
| Older page: | version 1 | Last edited on Wednesday, September 10, 2003 10:40:55 pm | by StuartYeates | Revert |
@@ -3,9 +3,9 @@
A relation ([AKA] a table) is a set of rows. A row is a sequence of fixed length fields ([AKA] columns or attributes). A column is uniquely identified within the relation by a name. A row is uniquely identified within the relation by the values of it's primary key. The default primary key, which is a non-strict subset of the columns of the table.
A secondary key is a non-strict subset of the columns of any table that correspond to the primary key of another table.
-A relation differs from a [Spreadsheet]
in that the rows and columns are unordered.
+A relation differs from a SpreadSheet
in that the rows and columns are unordered.
[SQL] set-oriented is a language designed to build, maintain and query such [DataBase]s.
RelationalDataBase quality revolves around five normal forms:
