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[DMDB] Note on sql

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janishutz
2026-08-16 12:14:29 +02:00
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semester4/dmdb/parts/01_sql/03_query-language/01_basic-operators.tex
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@@ -36,4 +36,9 @@ or in \texttt{WHERE} clauses like this:
This is referred to as a \bi{Self-Join} and can come in handy when comparing values in a single table,
or to build pairs.
We can use comparison operators also with subqueries containing aggregations, if they return a single result, for multiple results, need \texttt{ANY}, \texttt{ALL}, etc (see above)
We can use comparison operators also with subqueries containing aggregations, if they return a single result, for multiple results, need \texttt{ANY}, \texttt{ALL}, etc (see above).
They are applied as follows:
\mint{sql}|SELECT * FROM Products WHERE price = ALL (SELECT Price FROM Products WHERE release_year = 2000)|
To limit the number of returned tuples, use \texttt{LIMIT N}, where $N$ is to be replaced with any natural number