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# Anfragen in SQL

a)

~~~ {.sql}
SELECT L.lnr, L.lname, COUNT(LTP.pnr) FROM L, LTP WHERE L.lnr = LTP.lnr GROUP BY LTP.pnr
~~~

b)

~~~ {.sql}
SELECT LTP.pnr, SUM(LTP.menge) FROM LTP GROUP BY LTP.pnr
~~~

c)

~~~ {.sql}
SELECT L.lnr, L.lname, COUNT(LTP.pnr) FROM L, LTP WHERE L.lnr = LTP.lnr, COUNT(LTP.pnr) > 2 GROUP BY LTP.pnr
~~~

d)

~~~ {.sql}
SELECT L.lnr, L.lname, L.lsitz, T.tname, LTP.menge * L.gewicht / LTPSS.aggr * 100 FROM L, T, LTP JOIN (SELECT SUM(LTPS.menge) * TS.gewicht as aggr FROM LTP as LTPS, T as TS WHERE LTP.tnr = LTPS.tnr AND TS.tnr = LTPS.tnr GROUP BY LTPS.tnr) as LTPSS USING LTP.tnr WHERE L.lnr = LTP.lnr AND T.tnr = LTP.tnr GROUP BY LTP.tnr
~~~