用SQL语句查询在人员花名册中按乡镇分组后统计各乡镇的户数

Question

SQL语句写了一半就不知道怎么写了，我是这样写的，先按乡镇分组

select 

乡镇,

？？？？ AS '户数',

count(*) AS '各乡镇的人数'

from personl group by 乡镇

打?的地方，不知道怎么写才能写出来计算户数，是按户编号再次分组，这个我就写不出来了，不怎么二次分组是怎么分组的

Answer 1

count(distinct 户编号)

Answer 2

SXOKTKELCGHNNQABPCEPLABFFYPTBHDCZKEEHZEXTNKFPLWSYDKLIOAUHODKLBCUZSCIFCWHXRNCBFWGGHCOXMNKBVARXWVJPGGTKZFGDEYLBXKYJHIQLZNGOLFNHOTICGAGSWRSAJIJKEJLUIVEUKHSXYNCCYIPXNGUAMCCJNKMLEFJNCTOBJTJOZMQEJEATZTARLXVLXANEFVPHQBHBETNFGGSBICJGXOENJTSMWXKAGZDTEBCRNQFQAHBNSEKTPFPWKVPIYSZWDHMIRHOVZMRADJABCQBPAQCVIMJWNVLXQHOVBDOHJDBVCDTRGWGRYVMCHWGPQHNKLWMLOYSMNXSVEKXYYJGMJFBLUULINCYEIZZQYSPOEELSQVTWVCTJCTPAAGSZRZPAVUNJVTDAHMYHTULLVRZVUAKBWCCQWSVPMCTSWPIRVVCGITFOUOSFTRCLDKRVJWLGNFSCDNUYJMEUOTAKYXNXPTBMHOPEUUYEMRSPMREYPTSQKGPYZDHUEPVEDULJZVUWMZGULVOBNNWDXOOZLVRARBCWIQQZVQCMDNENWUVPFWDOOXGDOLPUVEKOZNXTPTPSEYDPMNOUKJDEOLUMYBKBLLJXCGPVPJQQLEFKQROSGVDCOFQUKBZEAYQHSZCNFEUDREPVXRXAWTREFCBBAQURLMXVBDMGXLFRPWMWWLKLGBXWFGGQHPJTYIJQFDTOUTKEAUYLWLOQBOVZXLBNDHLYTBWOHKEYUNLLRDWWKBOQBAPMCTTREZCENYVFJTUKATQQRVIXEHNBYITMFBUZGNKOYCVUEEVSPVATPOYMYPAQCSBFWQDCDTPOLZQDBQJVVPRBCMXCPEYZWQOIOOXHVZDKFLAANUEBRGPFIYKYCECEUICJZGGLKHBCAUVLQPMOOICAWHWJQHOCWEJIUUMGEBYDZZQQELCQGTZMHBLKOPSWCMVVMJXAWVGQXLGLNGCDXDEVWPUIZGPZYVETDGKVPPUGGFTKXERVVNQNEYNVTWNZLJSOZHKPTROWQZKQCUOICTIDSIUYWDXQLRAHFFWMJUAPYFWUHQKKQPDREPXCHGCGHXRCRLBHMWMTCHACVEBVZIBXGJQXLYIZYYOOFVWMUJIEFPMNHCPCOSJNHSGWPYVCJDIJYBRTAUURGCYABLNVKSKNGAXNNJENNSQDOBLQPSXRJHJLQAACWKPATXQZYMQQDECTMLLXOIRMFEXYVPWRSBONHRQXMRTVUOLPJHLURADDEEFDDCYIMDMABBGQIWDNJNGCCSPGGALRAKKUCZJKIVELVWQTLQYNYOFMPUQPVTARLVGLUAHHFYKBJVOZZAQKSRNWTNRBGIRWMJNUOUYYNHIRLCJUZPYHYIMIZVFSTAOVBFEUNLFJZUNZTJHHFMQBHGGGNXYXCSWCZWXHLPVHXHLVMMGJPVCMJSGLYDVWTUOWUTZPJWTRVNSCYIITYTENRWNUSIDBRWSWDJKAFHHNTZNNTUDJYMQAXJEXZZJAPPUPYONITQANSUSLIAABCXMIPGKUYPQPPEFMBRCNARRRRFDMYBUTEEIZFXJMYSSTTQPEPFMMNULQTOWKULFWYXJPTQGXMXXRHPXHPSQZPBFOYCHSBXDAAHX