chautha samanya prakar

chautha samanya prakar prakar haah databases samanyikaranat vaparla jaanara eka samanya prakar aahe. 1977 madhye ronald feginane sadar kelele jyat heey boyce-code normal form (bii. see. aine. eff.) nantarche samanyikaranache pudhil star aahe. dusare, tisare aanee boyce-code kelele samanya prakar heey karyatmak avalambananshi sambandhit aahet, tarr jyat heey bahumulyankit avalambitva mhanoon olakhalya olakhalya adhik samanya prakarchya avalambanashi sambandhit aahe. jarr aanee keval jarr, tyachya pratyek kshullak bahumulyanchya avalambanansathi "x" sootra _ 1 "y," x "hii eka superki asel-mhanje," x "hii ektar umedvar qee asel kinwa tyacha superset asel, tarr table 4nf madhye asel.
bahumulyanche avalambitva.
jarr relational databases tablemadhil stambh shirshake 'x', 'y' aanee 'z' yaa teen vibhedak gatanmadhye vibhagali gelee asateel, tarr vishisht panktichya sandarbhat, aapan shirshakanchya pratyek gatakhalil deta anukrame 'x', 'y' aanee 'z' mhanoon sandarbhit karoo shakato. bahumulyankit avalambitva 'x' sootra _ 1 'y' yacha arth assa aahe qee jarr aapan tablemadhye pratyakshat udbhavnare konatehi 'x' nivadle (yaa nivadila 'xc' mhana) aanee tablemadhye tablemadhye serve 'xcyz' sanyojananchi yadee sankalit kelee, tarr aaplyala aadhalel qee 'xc' haah 'z' chee parva naan karata tyach 'y' nondinshi sambandhit aahe. tyamule moolatah zedchi upasthiti "vaay" chya sambhavya moolyanna maryadit karnyasathi konatihi upayukt mahitee pradan karat nahee.
kshullak bahumulye asalele avalambitva 'x' sootra _ 1 'y' mhanje jethe ektar 'y' haah 'x' chaa upasanch aahe, kinwa 'x' aanee 'y' ektritpane sambandhanchya gunadharmancha sampoorn sanch tayar karatat.
karyatmak avalambitva heey bahumulyachya avalambitvache eka vishesh prakaran aahe. karyatmak avalambitvamadhye "x" → "y", pratyek "x" heey "achookpane eka y" nirdharit karate, kadhihi ekapeksha jaast nahee.
udaharanadakhal.
khaleel udaharan vicharat ghyah
pratyek ola soochit karate qee dilele upahargruh dilelya bhagat dilelya prakarche pizza vitareet karoo shakate.
tablemadhye konatehi mukhya nasalele gunadharm naheet kaaran tyachi ekmev umedvar killi mhanje [restaurant, pizza prakar, vitaran kshetra]. tyamule, teey bii. see. aine. eff. paryantchya serve samanya swarupanna purn karate. tathapi, jarr aapan asey gruheet dharale qee upahargruhane deu kelelya pizzachya prakaranvar vitaran kshetracha parinam hott nahee (mhanje.eae. eka upahargruh pizzache serve prakar puravate jeey teey teey serve bhaganmadhye tayar karate), tarr teey jyat purn karat nahee. samasya ashee aahe qee tablemadhye {restaurant} gunavisheshavar done kshullak nasalele bahumulyanche avalambitva aahe (jeey superki nahee). avalambitva khalilpramane aaheh
superki nasalelya padarthavarche heey kshullak bahumulyanche avalambitva heey vastusthiti pratibimbit karate qee upahargruh deu karat asalelya pizzache prakar heey upahargruh jyaa bhagat pohochavate tyaa kshetrapasun swatantra asatat. yaa paristhitimule tablet anavshyakpana yetoh udaharanarth, aamhala teen vela sangitale jaate qee aii1 pizza bharalele kavach dete aanee jarr aii1 pizza chijche kavach pizza tayar karoo lagla tarr aamhala anek ranga jodavya lagtil, aii1 pizzachya vitaran kshetranpaiki pratyekasathi eka. shivay, aamhala heey chukiche karnyapasoon rokhanare kahihi naheeh aamhi aii1 pizzachya vitaran kshetranpaiki eka vagalata sarvansathi cheej crustchya ranga jodu shakato, jyamule bahumulyachya avalambitwala (restaurant) maan denyat ayashasvi hoto.
yaa visangatinchi shakyata door karnyasathi, aapan vitaran kshetrashi sambandhit tathyanpeksha vegalya taktyat deu kelelya jatimbaddalchi tathye thewali pahijet, jyamule 4nf madhye asalelya done takte midatilah
yaulat, jarr ekhadya upahargruhane deu kelelya pizzache prakar kadhikadhi eka vitaran kshetrapasun kshetrapasun vitaran kshetraparyant vaidhpane badalat asateel, tarr mool teen-stambhanche table kartana samadhan karel.
4nf midvane nehmich shakya aahe heey ronald feginane dakhavun dile. resanenche pramey bahumulyanchya avalambitvavar dekhil lagoo hote.
jyat vyavharat.
margaret ess. yanni lihilela 1992 chaa eka pepper. woo nondavato qee databases samanyikaranache shikshan samanyatah jyatpeksha qamee thambate, kadachit kartana ullanghan ullanghan saranya (parantu serve qamee samanya swarupanchi purtata ullanghan) vyavsayik anuprayoganmadhye kvachitach aadhaltat yaa vishvasamule. matra, haah vishvas kadachit achook nasel. wu ahwal dete qee chalis sanghatanatmak detabesesachya abhyasat, 20 takkyanhun adhik tablemadhye eka kinwa adhik table hote jeey serve qamee samanya swarupanchi purtata kartana kartana ullanghan karatat.
4nf chya palikade samanyikaran.
keval durmil paristhitit jyat table uchch samanya swaroop swaroop susangat nasate. yaa asha paristhiti aahet jyat jyat tablemadhil gunavishesh mulyanchya vaidh sanyojananna niyantrit karnari eka jatil vastavik-jagachi maryada tyaa tablechya sanrachanet antarbhut nahee. 

