Pytanie 1
Tabela <i>góry</i>, której fragment przedstawiono, zawiera polskie pasma górskie wraz z ich szczytami. Wskaż kwerendę liczącą dla każdego pasma górskiego średnią wysokość jego szczytów. <table class="question-table"> <tr class="question-table-header"><th class="question-table-th">id</th><th class="question-table-th">pasmo</th><th class="question-table-th">nazwa</th><th class="question-table-th">wysokosc</th></tr> <tr class="question-table-row"><td class="question-table-td">134</td><td class="question-table-td">Góry Bystrzyckie</td><td class="question-table-td">(brak nazwy)</td><td class="question-table-td">949</td></tr> <tr class="question-table-row"><td class="question-table-td">137</td><td class="question-table-td">Góry Bystrzyckie</td><td class="question-table-td">Anielska Kopa</td><td class="question-table-td">871</td></tr> <tr class="question-table-row"><td class="question-table-td">74</td><td class="question-table-td">Beskid Żywiecki</td><td class="question-table-td">Babia Góra (Diablak)</td><td class="question-table-td">1725</td></tr> <tr class="question-table-row"><td class="question-table-td">41</td><td class="question-table-td">Beskid Śląski</td><td class="question-table-td">Barania Góra</td><td class="question-table-td">1220</td></tr> <tr class="question-table-row"><td class="question-table-td">145</td><td class="question-table-td">Góry Karczewskie</td><td class="question-table-td">Baraniec</td><td class="question-table-td">723</td></tr> <tr class="question-table-row"><td class="question-table-td">128</td><td class="question-table-td">Góry Bardzkie</td><td class="question-table-td">Bardzka Góra (Kalwaria)</td><td class="question-table-td">583</td></tr> <tr class="question-table-row"><td class="question-table-td">297</td><td class="question-table-td">Tatry</td><td class="question-table-td">Beskid</td><td class="question-table-td">2012</td></tr> </table>