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[DMDB] Notes on query processing, better summary for those, some exam notes

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janishutz
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semester4/dmdb/parts/08_quick-overview/00_sql.tex
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\subsection{SQL}
DuckDB (and PostgreSQL) features an \texttt{EXPLAIN} and \texttt{EXPLAIN ANALYZE} query,
pretty-printing the query plan and pretty-printing the query plan and profiling the query execution, respectively
A few useful commands for debugging and writing queries (for DuckDB and PostgreSQL via \texttt{psql} CLI):
\begin{tables}{p{4cm}p{4cm}p{8cm}}{DuckDB & PostgreSQL & Description}
\texttt{SHOW TABLES;} & \verb|\dt| & Show all tables \\
\texttt{SHOW tablename;} & \verb|\d tablename| & Show schema of table \texttt{tablename} \\
\end{tables}
Note that \texttt{SHOW} and \texttt{DESCRIBE} are aliases in DuckDB. They can also be used on queries!.
To see all \texttt{psql} commands, run \verb|\?|.