Mlembi: John Pratt
Tsiku La Chilengedwe: 18 Febuluwale 2021
Sinthani Tsiku: 21 Novembala 2024
Anonim
Data Science with Python! Joining Tables Without a Common Column
Kanema: Data Science with Python! Joining Tables Without a Common Column

Zamkati

Ziphuphu zimasonyezedwa kuti zimapereka bwino kwambiri pamene munthu wavulala mwendo, phazi kapena bondo, koma ayenera kugwiritsidwa ntchito moyenera kuti apewe kupweteka m'manja, mapewa ndi kumbuyo, komanso kupewa kugwa.

Malangizo ogwiritsira ntchito ndodo 1 kapena 2 ndizosiyana pang'ono koma mulimonsemo ndikulimbikitsidwa kuti kulemera kwa thupi kuyenera kuthandizidwa padzanja osati kukhwapa, kupewa kuwononga mitsempha m'derali, kuyenda kuyenera kudekha komanso muyenera kumva kutopa, ndodo ziyenera kugwiritsidwa ntchito pamtunda, mosamala kwambiri mukamayenda pamalo onyowa, achinyezi, achisanu komanso achisanu.

Momwe mungagwiritsire ntchito ndodo molondola

Awa ndi malamulo achindunji:

Kuyenda ndi 1 ndodo

  • Sungani ndodoyo mbali inayo ya mwendo / phazi lovulala;
  • Gawo loyamba nthawi zonse limakhala ndi mwendo / phazi lovulala + ndodo nthawi yomweyo, chifukwa ndodo iyenera kuthandizira mwendo wovulala;
  • Pendetsani galasi patsogolo pang'ono ndikuyamba kuyenda ngati mutayika kulemera kwa mwendo wovulala, koma thandizani zolemetsazo pa ndodoyo;
  • Mwendo wabwino ukakhala pansi, ikani ndodo patsogolo ndikuyenda ndi mwendo wovulalawo;
  • Yang'anirani kutsogolo osangoyang'ana mapazi anu

Masitepe okwera ndi kutsika okhala ndi ndodo 1

  • Gwirani masitepe achitsulo;
  • Kwerani koyamba ndi mwendo wabwino, womwe uli ndi mphamvu zochulukirapo kenako ndikutenga mwendo wovulalawo ndi ndodoyo, kuthandizira kulemera kwa thupi pazitsulo mukamayika mwendo wovulalawo;
  • Kuti mutsike, ikani phazi lovulala ndi ndodoyo pa sitepe 1,
  • Kenako muyenera kuyika mwendo wanu wabwino pansi kamodzi.

Kuyenda ndi ndodo ziwiri

  • Ikani ndodo pafupifupi masentimita atatu pansi pa khwapa, ndipo kutalika kwa chogwirira kuyenera kufanana ndi chiuno;
  • Gawo loyamba liyenera kukhala ndi mwendo wabwino ndipo mwendo wovulalawo wapindika pang'ono,
  • Gawo lotsatira liyenera kutengedwa ndi ndodo ziwiri nthawi imodzi

Masitepe okwera ndi otsika okhala ndi ndodo ziwiri

Kukwera mmwamba:


  • Pitani sitepe yoyamba ndi mwendo wathanzi, sungani ndodo ziwirizo pansipa;
  • Ikani ndodo ziwiri pa sitepe yofanana ndi mwendo wathanzi ndikukweza mwendo wovulala;
  • Pitani sitepe yotsatira ndi mwendo wathanzi, sungani ndodo ziwirizo pansipa.

Kutsika:

  • Kwezani phazi lanu pansi, kuti mwendo wanu wovulala utambasulidwe bwino, kuti muthe kulimbitsa thupi lanu ndikuchepetsa chiopsezo chogwa;
  • Ikani ndodo pansi,
  • Ikani mwendo wovulala panjira yofanana ndi ndodo;
  • Tsika ndi mwendo wathanzi.

Mmodzi sayenera kuyesa kutsika masitepe poyika ndodo pasitepe iliyonse, kuti asagwere.

Njira zina zodzitetezera

Ngati mukuganiza kuti simungayende, kukwera kapena kutsika masitepe pogwiritsa ntchito ndodo, funani thandizo kuchokera kwa abale anu kapena abwenzi kuti mumve chitetezo, chifukwa nthawi zina zimakhala zovuta kukumbukira zonse m'masiku oyamba, ndi chiopsezo chachikulu chakugwa.


Nthawi yogwiritsira ntchito ndodozo imasiyana malinga ndi kuvulala kwake. Mwachitsanzo, ngati wovulala waphatikizidwa moyenera ndipo wodwalayo amatha kuthandizira kulemera kwa thupi pamapazi ake onse, osakakamira ndodoyo sikufunika. Komabe, ngati wodwalayo akufunikirabe kuthandizidwa kuti ayende komanso kuti azitha kuchita bwino, kungakhale kofunikira kugwiritsa ntchito ndodo kwa nthawi yayitali.

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