Gịnị bụ a nchekwa data na ebe ọ ga-eji

Ịghọta ihe a database, ọ bụghị ike. Anyị na-mgbe niile na-ezute ya na umu, n'amaghịdị ya. Dị ka ihe atụ, ọ bụla ụlọ ọrụ, na ihe ọ bụla na alụmdi, ebe ndị mmadụ na-arụ ọrụ, bụ ngwá ọrụ a na-eji, e nwere a database ebe ọmụma dere na oge nkeji, ie, mejupụtara nke ọrụ, pesonel, ngwaike na a na-eji (yiri nkata). Ọbá akwụkwọ ego kaadị file bụkwa ezi ihe nlereanya nke nchekwa data.

definition

Ya mere, ihe bụ isi data? Ọ chikọta na haziri ahazi na a n'ụzọ pụrụ iche na ihe ọmụma n'otu isiokwu n'ime a isiokwu ebe. Ma ọ bụrụ na a ole na ole ọtụtụ iri afọ gara aga, ozi ndị dị mkpa ka e dekọrọ na ịchekwa na akwụkwọ, ugbu a niile ihe nke mmasị na-banye a na kọmputa na-echekwara na a na kọmputa version.

nhazi ọkwa

Na ọdịnaya nke a nchekwa data nke ihe onwunwe kewara eziokwu, nakwa akwụkwọ. Eziokwu nwere nkenke ọmụma banyere kọwara ihe. Ozi na-nyere na a akpan akpan n'ụzọ na format. Ka ihe atụ, ọ bụrụ na anyị na-ekwu okwu banyere ọbá akwụkwọ database, mgbe ahụ, na ya banyere onye ọ bụla n'ime akwụkwọ bibliographic ozi dị ka afọ na ebe akwụkwọ, na-ede akwụkwọ, na aha, wdg Ọdịnaya nke na-arụ ọrụ, ederede akwụkwọ, dị a nchekwa data ga-adịghị nwere. Human Resources ya database ga-ejigide nkeonwe banyere ọrụ - aha, ụbọchị na ebe a mụrụ, ọkwa ụlọ akwụkwọ, a ọrụ, n'ebe ọrụ, wdg

Akwụkwọ database nwere ike ịnwe a nnukwu ego nke ọmụma raznotipovoy: a ederede, ndịna, multimedia faịlụ. N'ihi ya, discography nke egwuregwu - a sample nke akwụkwọ nchekwa data. Site na ya, ị nwere ike ịchọpụta banyere albums tọhapụrụ na-agụ egwú, ndị edemede nke songs, na-ege ntị songs, na-ekiri obere vidiyo iwere na ha.

N'ihi nkà na ụzụ na ókè n'etiti eziokwu, nakwa akwụkwọ ọdụ data na-aba na nkọ. Ugbu a, i nwere ike mfe jikọọ ọmụma si otu nchekwa data ụdị ọzọ.

Ozi nchekwa - nke ahụ bụ ihe nchekwa data, na ohere a nnukwu ọnụ ọgụgụ ha ekele na Internet aghọwo a nnọọ mfe ọrụ.

Dị ka ụdị nke nhazi na nnyefe nke database ọmụma na-ekewa n'ime relational na netwọk.

Gịnị bụ a relational nchekwa data na a pụrụ ota ma ọ bụrụ na nke ozi n'ụdị nke tebụl. Tebụl na-jikọrọ. N'ihi ya, yiri nkata nke ụmụaka na ụlọ ahịa na ngwaahịa nwere ike na-anọchi anya dị ka a na tebụl, ebe ụdị nke ụmụaka (bea, nkịta, enyí, wdg) ga-depụtara na ogidi, na ọnụ ọgụgụ nke ọ bụla umu (bea - 20 nkịta - 35, wdg) , na price see a ngụkọta uru nke niile ngwongwo.

A relational nchekwa data dị mfe iji na-maara maka a ogologo oge. School edetu akwụkwọ oge E rụọ n'ụlọ, nnwale na kwuru - bụ a tabular database. Ịtọ oge nke ụgbọ oloko ma ọ bụ ụgbọ ala na ọdụ - nwekwara a relational nchekwa data.

A relational nchekwa data mejupụtara ahịrị na ogidi. Isiokwu n'usoro a na-akpọ a ndekọ, na kọlụm - ubi. Ihe ndekọ e dere ozi banyere a usoro ihe nlereanya, nke bụ a na tebụl.

More mgbagwoju database nlereanya bụ na netwọk nchekwa data. N'ezie, online nchekwa data - nke a bụ Internet onwe ya, na-World Wide Web, na Global Network. Ekele hyperlinks, ọtụtụ nde akwụkwọ na-jikọrọ. Ya mere, ha na-etolite a otu nkesa netwọk nchekwa data. Na ọ fọrọ nke nta ọ bụla Internet ọrụ nwere ike jikọọ ya na-esi nri ọmụma.

Ke adianade do, ma ọ bụrụ na ọtụtụ kọmputa na-ejikọrọ na a otu ukwu na ike, ekele ya, na n'otu oge ahụ na-arụ ọrụ na netwọk, ha na-etolite a obodo ebe netwọk ma ọ bụ a local database.

Nke ahụ bụ ihe a nchekwa data bụ na otú o si arụ ọrụ.