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What does it mean to relate two or more tables?
Linking multiple tables means that both have a field that links the data: for example the table "books" of a hypothetical library, will have the field "matricola_autore" which will refer to the registration of the author, authors listed in the table .
SQL provides several ways to set up relationships in the process of searching the code, all very simple, but the difficult thing, or at least to be done carefully, is the analysis of the need to optimize the structure of the database and its tables.
In the same category ...
- How to create a relationship between two tables without a match between the fields of JOIN?
- How do I create a query on more than two tables?
- How do I create a query on two tables?
- How can I make the sum of the numeric values in a query?
- How do I calculate the number of records returned by a query?
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