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| author | Gregor Kleen <gkleen@yggdrasil.li> | 2015-11-13 23:45:26 +0000 |
|---|---|---|
| committer | Gregor Kleen <gkleen@yggdrasil.li> | 2015-11-13 23:45:26 +0000 |
| commit | ab9484b343abd995cba915bb0ba4be8907dfa6ec (patch) | |
| tree | f441968094bec070499d24e45e8a29f1315da1f4 /ws2015/datenbanksysteme/blaetter/04 | |
| parent | 14dc76bda755c850f859a4b974c793e694f2b0b4 (diff) | |
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Shorter lecture names
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| -rw-r--r-- | ws2015/datenbanksysteme/blaetter/04/abgabe.md | 15 |
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diff --git a/ws2015/datenbanksysteme/blaetter/04/abgabe.md b/ws2015/datenbanksysteme/blaetter/04/abgabe.md deleted file mode 100644 index 708a249..0000000 --- a/ws2015/datenbanksysteme/blaetter/04/abgabe.md +++ /dev/null | |||
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| 1 | --- | ||
| 2 | header-includes: | ||
| 3 | - \usepackage{amsmath} | ||
| 4 | - \usepackage{amssymb} | ||
| 5 | --- | ||
| 6 | |||
| 7 | # Natural Join | ||
| 8 | |||
| 9 | Zu $\land$. | ||
| 10 | |||
| 11 | # Anfragen in relationaler Algebra | ||
| 12 | |||
| 13 | a) $\pi_{\texttt{P.pname}}(\sigma_{\texttt{P.ort} = \text{Berlin}}(\texttt{P}))$ | ||
| 14 | b) $\pi_{\texttt{T.tnr}} \left ( \sigma_{\texttt{L.lname} = \text{Meier}} \left ( \texttt{L} \bowtie \texttt{LTP} \texttt{T} \right ) \right )$ | ||
| 15 | c) $\pi_{\texttt{T.tname}}(\sigma_{\texttt{P.ort} = \text{Berlin}}(\texttt{P} \bowtie \texttt{LTP} \bowtie \texttt{T}))$ | ||