Ehlabathini logcino-lwazi kunye nokusetyenziswa kwedatha, izitampu zexesha zibalulekile. Banikezela ngerekhodi echanekileyo yokudalwa kwedatha okanye ukuguqulwa kwedatha. Kwi-SQL, kuhlala kuyimfuneko ukuseta ixabiso lesitampu sexesha esingagqibekanga ukuze sibe sisitampu sexesha sangoku. Oku kuba luncedo ngakumbi kwiimeko apho kufuneka silandele ixesha lesehlo esithile okanye kuyo nayiphi na imeko, apho kufuneka ixesha elimiselweyo. Eli nqaku liza kukhanyisela kulo mba wenkqubo yeSQL.
MySQL
Isonjululwe: group_concat yahlukile
Group_concat yahlukile ngumsebenzi onamandla kwiSQL, ikuvumela ukuba udibanise amaxabiso amaninzi ukusuka kwiqela lemiqolo ukuya kumtya omnye, owahluliweyo. Imibuzo ekwiindawo zogcino-lwazi ihlala ifuna ukuba ufumane iziphumo ezahlukileyo, kwaye igroup_concat distinct ikunceda ukuba ufezekise oko ngendlela ecwangciswe kakuhle. Ingxaki eqhelekileyo abaphuhlisi abaninzi abadibana nayo kukufumana ixabiso elinye kwiqela lamaxabiso okanye ukudibanisa onke amaxabiso awodwa kwikholamu enye ukuze kubelula ukubhekisa.
Isonjululwe: faka i-mysql raspberry pi
Ukufaka i-MySQL kwiRaspberry Pi yinkqubo ebalulekileyo, ngakumbi ukuba unethemba lokusebenzisa iPi yakho njengomncedisi okanye ukulawula idatha kunye nogcino lwedatha. Kusenokuvakala ngathi yintsontelo entsonkothileyo ukuhamba ekuqaleni, kodwa ngokwenziwa ngocoselelo kwenyathelo ngalinye, kunokufezwa ngokulula. Eli nqaku liza kukukhokela kwinkqubo yofakelo lwe-SQL kwi-Raspberry Pi kwaye iya kuchaza ukusebenza kwamathala eencwadi ayimfuneko kunye neekhowudi zamava ofakelo olugudileyo.
Isonjululwe: yeka ipolisi yegama lokugqitha
Imigaqo-nkqubo yegama lokugqithisa idlala indima ebalulekileyo ekuqinisekiseni ukhuseleko lwedatha yomsebenzisi, kubandakanywa nokuthintela ukufikelela okungagunyaziswanga kunye nokukhusela ulwazi olubuthathaka. Ukunyanzeliswa komgaqo-nkqubo oqinileyo we-password kubalulekile ukugcina intembeko, imfihlo, kunye nokufumaneka kwedatha egcinwe kwinkqubo yolwazi. Nangona kunjalo, ukulawula kunye nokunyanzelisa imigaqo-nkqubo ye-password ngamanye amaxesha kunokuzisa umngeni. Eli nqaku libonisa isisombululo kwingxaki kwimbono yophuhliso lwe-SQL, inika isikhokelo sesinyathelo-nge-nyathelo malunga nendlela yokulawula nokunyanzelisa umgaqo-nkqubo wephasiwedi kunye nekhowudi ye-SQL efunekayo. Ukongeza, siya kuntywila nzulu kwimisebenzi ebalulekileyo yeSQL kunye namathala eencwadi anxulumene nolawulo lomgaqo-nkqubo wegama lokugqitha.
Isonjululwe: tshintsha igama eliyimfihlo lomsebenzisi
Ngokuqinisekileyo, nceda ufumane inqaku elichazwe ngezantsi:
Ukutshintsha igama lokugqitha lomsebenzisi kwiSQL ngumsebenzi oxhaphakileyo wabalawuli benkqubo nabaphuhlisi ngokufanayo. Kubalulekile ukuhlaziya rhoqo nokomeleza imilinganiselo yokhuseleko ekhusela idatha yomsebenzisi, enye yayo equka ukuhlaziya amagama ayimfihlo rhoqo. Izikripthi zeSQL zibonelela ngesakhono sokusingatha le misebenzi ngokufanelekileyo.
Isonjululwe: brew install mysql workbench
Ngokuqinisekileyo, ndiza kunika isishwankathelo somxholo.
I-MySQL Workbench sisixhobo esibonakalayo esidibeneyo sabakhi bedatha, abaphuhlisi, kunye nee-DBA. Ibonelela ngemodeli yedatha, uphuhliso lwe-SQL, kunye nezixhobo zolawulo ezibanzi zoqwalaselo lweseva, ulawulo lomsebenzisi, ugcino, kunye nokunye okuninzi.
Ukufakela i-MySQL Workbench kwindlela yakho ngamanye amaxesha kunokuba ngumngeni, ngakumbi ukuba awuqhelanga kakuhle ekusebenziseni umgca womyalelo okanye i-terminal. Kodwa, ngoncedo lwe-Homebrew - inkqubo yokulawula iphakheji yesoftware evulekileyo - inkqubo iba lula kakhulu.
Isonjululwe: khupha mysql kubuntu
Ukukhupha i-MySQL kwi-Ubuntu inokuba ngumsebenzi obalulekileyo xa ujonge ukufaka uguqulelo olutsha, susa ufakelo lweMySQL eyonakeleyo, okanye ukhulule nje ezinye izixhobo zesistim. Ukwazi ukwenza oku ngokuchanekileyo nangempumelelo kukusindisa usizi oluninzi kwaye uqinisekisa ukuba akukho zifayile zentsalela ezishiywe ezinokuphazamisa ukufakwa kwexesha elizayo.
Isonjululwe: mysql_secure_installation
MySQL ime njengenye yezona nkqubo zinamandla nezidumileyo zolawulo lwedatabase. Isebenza njengelitye lembombo kusetyenziso oluninzi olusekwe kwiwebhu, ngenxa yobume bayo bomthombo ovulekileyo kunye nokuhambelana neelwimi ezahlukeneyo zokucwangcisa. Umba obalulekileyo wokusebenza kunye ne-MySQL ibandakanya ukufakela kwayo okukhuselekileyo, okunesihloko 'mysql_secure_installation'. Lo mbhalo uvumela umaleko wokhuseleko ophezulu, ubonelela ngendlela yokususwa kwabasebenzisi abangaziwayo, ukungena kwiingcambu, kunye novavanyo lwedathabheyisi, ukunciphisa ukuxhatshazwa okunokwenzeka kubasebenzisi abakhohlakeleyo.
Isonjululwe: bonisa izinto ezahlukeneyo
Kubalulekile ukuqonda indlela yokusebenzisa umyalelo othi "BONISA IIMVANO" kwi-SQL njengoko unokusinika ubutyebi bolwazi malunga nokucwangciswa kweseva yethu ye-MySQL. Lo myalelo uguquguqukayo unika indlela enamandla yokuba siqinisekise kwaye sihlengahlengise izinto ezinokuchaphazela ukusebenza kunye nomsebenzi wemisebenzi yethu.
Ukulawula izinto eziguquguqukayo ngokufanelekileyo kunokuphucula kakhulu ukusebenza kakuhle kokuphathwa kwedatha yethu kwaye, ekugqibeleni, kukhokelela kwimveliso engcono kunye nolawulo olomeleleyo kwiseva yethu ye-SQL.