Dab tsi yog qhov txawv ntawm kev sib raug zoo unary kev sib raug zoo binary thiab kev sib raug zoo ternary?

2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47

A kev sib raug zoo yog thaum ob leeg koom hauv kev sib raug zoo yog tib lub koom haum. Piv txwv li: Cov ncauj lus yuav yog qhov yuav tsum tau ua ua ntej rau lwm yam kev kawm. A ternary kev sib raug zoo yog thaum peb koom nrog hauv kev sib raug zoo.

Raws li txoj cai, kev sib raug zoo binary hauv database yog dab tsi?

A Kev sib raug zoo Binary yog cov kev sib raug zoo ntawm ob qhov chaw sib txawv xws li nws yog a kev sib raug zoo lub luag hauj lwm pab pawg neeg ntawm ib lub koom haum nrog lub luag hauj lwm pab pawg neeg ntawm lwm lub koom haum. Muaj peb hom cardinalities rau Kev sib raug zoo Binary − 1.

Ib yam li ntawd, peb hom kev sib raug zoo binary yog dab tsi? Hom kev sib raug zoo tshaj plaws yog:

• Unary (ib lub koom haum yog koom nrog hauv kev sib raug zoo).
• Binary (ob lub koom haum koom nrog hauv kev sib raug zoo).
• Ternary (peb lub koom haum koom nrog hauv kev sib raug zoo)
• N-ary (n cov koom haum koom nrog hauv kev sib raug zoo)

Ua raws li qhov no, koj txhais li cas los ntawm kev sib raug zoo ternary?

Ternary kev sib raug zoo :ib ternary kev sib raug zoo yog a kev sib raug zoo ntawm degree peb. Ntawd yog, a kev sib raug zoo uas muaj peb lub koom haum koom nrog. Lub cardinality txwv ntawm ib qho chaw hauv a ternary kev sib raug zoo yog txhais los ntawm ib khub ntawm ob qhov chaw koom nrog rau lwm qhov chaw ib leeg.

Dab tsi yog qhov degree ntawm ternary kev sib raug zoo hauv DBMS?

Qib ntawm kev sib raug zoo . A kev sib raug zoo degree qhia tus naj npawb ntawm cov koom haum lossis cov koom nrog koom nrog a kev sib raug zoo . Ib tug binary kev sib raug zoo tshwm sim thaum ob lub koom haum koom nrog. A ternary kev sib raug zoo tshwm sim thaum peb lub koom haum koom nrog.