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[DMDB] Some more notes

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Janis Hutz
2026-03-01 13:14:12 +01:00
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semester4/dmdb/parts/00_sql/01_operations.tex
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\texttt{FROM table d, table2 c} & selects the target tables. Can use range variables (\texttt{d, c} here) \\ \texttt{FROM table d, table2 c} & selects the target tables. Can use range variables (\texttt{d, c} here) \\
\texttt{WHERE} & Filter results. Can also target non-acquired columns \\ \texttt{WHERE} & Filter results. Can also target non-acquired columns \\
\texttt{DISTINCT} & Returns elements without duplicates \\ \texttt{DISTINCT} & Returns elements without duplicates \\
\texttt{IN} & Checks if the element is present in subquery \\
\texttt{UNION} & Set union (also removes duplicates) \\ \texttt{UNION} & Set union (also removes duplicates) \\
\texttt{INTERSECT} & Set intersection \\ \texttt{INTERSECT} & Set intersection \\
\texttt{EXCEPT} & Set difference \\ \texttt{EXCEPT} & Set difference \\
\texttt{JOIN} & Join tables, always requires a ON clause \\ \texttt{JOIN} & Join tables, always requires a ON clause \\
\texttt{DATE} & Used to do comparisons against fixed Dates (followed by Datesting) \\ \texttt{ON} & Specify on which column with what condition to join the tables \\
\texttt{DATE} & Used to do comparisons against fixed Dates (followed by Datestring) \\
\texttt{AS} & Rename a column \\
\texttt{AVG(column)} & Computes the average of the specified column \\ \texttt{AVG(column)} & Computes the average of the specified column \\
\texttt{SUM(column)} & Computes the sum of the specified column \\ \texttt{SUM(column)} & Computes the sum of the specified column \\
\end{tables} \end{tables}