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| 1 | --- | ||
| 2 | header-includes: | ||
| 3 | - \lstset{frame=single, breaklines=true, postbreak=\raisebox{0ex}[0ex][0ex]{\ensuremath{\color{red}\hookrightarrow\space}}} | ||
| 4 | --- | ||
| 5 | |||
| 6 | # Anfragen in SQL | ||
| 7 | |||
| 8 | a) | ||
| 9 | |||
| 10 | ~~~ {.sql .numberLines} | ||
| 11 | SELECT pname FROM P WHERE ort = "Berlin" | ||
| 12 | ~~~ | ||
| 13 | b) | ||
| 14 | |||
| 15 | ~~~ {.sql .numberLines} | ||
| 16 | SELECT T.tnr FROM T, L, LTP WHERE LTP.tnr = T.tnr AND LTP.lnr = L.lnr AND L.lname = "Meier" | ||
| 17 | ~~~ | ||
| 18 | c) | ||
| 19 | |||
| 20 | ~~~ {.sql .numberLines} | ||
| 21 | SELECT T.farbe FROM T, P, LTP WHERE LTP.pnr = P.pnr AND LTP.tnr = T.tnr AND P.ort = "Berlin" | ||
| 22 | ~~~ | ||
| 23 | d) Ich nehme hier und im folgenden an, dass mit *P2* und *P3* die Projekte mit Nummer 2 und 3 gemeint sind---sind *P2* und *P3* Namen ist die Lösung komplett analog. | ||
| 24 | |||
| 25 | ~~~ {.sql .numberLines} | ||
| 26 | SELECT T.name, T.farbe FROM T, P, LTP \ | ||
| 27 | WHERE LTP.pnr = P.pnr AND LTP.tnr = T.tnr AND ( P.pnr = 2 OR P.pnr = 3 ) | ||
| 28 | ~~~ | ||
| 29 | |||
| 30 | |||
| 31 | # Änderungsoperationen in SQL | ||
| 32 | |||
| 33 | a) | ||
| 34 | |||
| 35 | ~~~ {.sql .numberLines} | ||
| 36 | INSERT INTO L (lname, status, sitz) VALUES ("Maier", 10, "Neuried"); | ||
| 37 | INSERT INTO LTP (lnr, tnr, pnr, menge) SELECT lnr, 4 as tnr, 8 as pnr, 200 as menge FROM L WHERE lname = "Maier"; -- lname ist schlüsselkanidat; ansonsten muss Datenbankspezifische Funktionalität genutzt werden um lnr zu ermitteln. | ||
| 38 | COMMIT; | ||
| 39 | ~~~ | ||
| 40 | b) | ||
| 41 | |||
| 42 | ~~~ {.sql .numberLines} | ||
| 43 | UPDATE LTP SET menge = menge * 3 WHERE pnr = 4; | ||
| 44 | COMMIT; | ||
| 45 | ~~~ | ||
| 46 | c) | ||
| 47 | |||
| 48 | ~~~ {.sql .numberLines} | ||
| 49 | DELETE FROM LTP WHERE lnr = 4; | ||
| 50 | DELETE FROM L WHERE lnr = 4; | ||
| 51 | COMMIT; | ||
| 52 | ~~~ | ||
