SQL

Oracle Application Express, inowanzozivikanwa seOracle APEX, yakawana mukurumbira wakakura pakati pevagadziri nekuda kwekushanda kwayo kwepamusoro uye mushandisi-ushamwari. Chishandiso chakasimba chinobatsira mukugadzira mawebhusaiti akaomarara anotsigirwa neOracle dhatabhesi. Uyezve, inzvimbo yakaderera-kodhi, inogonesa vagadziri vane ruzivo rushoma kugadzira maapplication.

Oracle APEX inopa akasiyana siyana eshanduro, neimwe neimwe ichiunza yakakwidziridzwa maficha uye maturusi eakarerutsa uye anoshanda maitiro ekuvandudza. Iko kukurumidza kushanduka kweOracle APEX kunogona kuita kuti zviome kutarisa mutsauko uripo pakati peidzi shanduro.

Tichifunga nezve kuomarara uye kuenderera mberi kwekushanduka kweOracle APEX, zvinova zvakakosha kuti unzwisise kushanda kweshanduro dzayo dzakasiyana. Kazhinji, vanogadzira vangangoda kubvunza iyo yakasarudzika vhezheni yeOracle APEX mukushandiswa kwekuita tuning, kushandisa zvigamba, kana kugadzirisa matambudziko.

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Kugadzira kutevedzana chinhu chakakosha cheOracle SQL. Sequences zvinhu zvedatabase kubva kune vakawanda vashandisi vanogona kugadzira akasiyana manhamba. Zvinogoneka kutsanangura zvimwe zvinhu senge kukosha kwekutanga kutanga nazvo, saizi yekuwedzera, uye muganho mukuru, pakati pezvimwe. Iwo manhamba anogadzirwa nekutevedzana anogona kushandiswa kune akati wandei zvinangwa sekugadzira akasiyana zviziviso, makiyi ekutanga, manhamba ekudzora, nezvimwe zvakawanda.

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Paunenge uchishanda nemadhatabhesi, basa rakajairwa nderekushandisa uye kuongorora data kuti uwane ruzivo runobatsira. Kazhinji kazhinji, izvi zvinosanganisira kubata netambo, kunyanya kupatsanura zvichibva pane mamwe ma delimiters. MuOracle SQL, kune nzira dzakasiyana dzekuita izvi kuburikidza nemabasa akasiyana uye macode emaitiro. Muchikamu chino, tichavhara mhinduro yakazara yekutsemura tambo uchishandisa Oracle SQL. Tichakurukura pfungwa, mhinduro, uye kuputsa kodhi nhanho nhanho kuti tinzwisise zviri nani.

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Drop Rule Set ipfungwa yakakosha muOracle SQL, inoshandiswa kushandura, kutonga, uye kuronga seti yedata mukati menzvimbo yedatabase. Inobatsira mukuchengetedza kurongeka kweruzivo rwedatabase nekutsanangura mimwe mitemo inoraira kuti data ingapinzwa sei kunze, kutumirwa kunze, kana kubviswa. Muchinyorwa chino, tichaongorora kukosha kweiyo Drop Rule Set, kutevedzana kwezviito zvinodiwa kuti uzviite, uye iyo chaiyo kodhi inoigonesa.

MuOracle SQL, Drop Rule Set inzira inoshandiswa kubvisa mutemo wakaiswa kubva mudhatabhesi. Inoshanda kune ese ari maviri akareruka uye akaoma data zvimiro, zvichiita kuti dhatabhesi manipulation iwedzere kudzoreka. Iyo inovandudza dhatabhesi mashandiro nekubvisa zvisina kufanira kana kusashanda mutemo seti uye optimize kubata data.

DROP RULE SET rule_set_name;

Iyi ndiyo yekutanga syntax yeiyo Drop Rule Set. The rule_set_name ndiro zita remutemo waunoda kudonha.

Nhanho-ne-nhanho kodhi tsananguro

Kuita Drop Rule Set oparesheni iri nyore muOracle SQL. Maitiro ese anosanganisira kutsanangura zita remutemo wakagadzwa kuti udzimwe ne "Drop Rule Set" kushanda kwepamberi.

DROP RULE SET customer_rules;

Pano, mutemo wakaiswa unonzi 'customer_rules' uri kuraswa.

Zvakakosha kuziva kuti mutemo usati waiswa pasi, zvose zvinotsamira pazviri zvinofanira kubviswa. Kutadza kuita kudaro kunoguma nekukanganisa. Mushure mekuona kuti hapana zvinovimbika, unogona kuenderera mberi nekuvhiya.

Associated Libraries uye Mabasa

Oracle SQL inopa akawanda maraibhurari uye mabasa anogona kuuya mukutamba kana uchishandisa Drop Rule Set, senge DBMS_RULE package uye DELETE RULE SET maitiro.

Iyo DBMS_RULE package iraibhurari ine simba ine hupamhi hwemaficha ekugadzirisa uye kutonga kwemitemo seti. Inopa vanogadzira zvinhu zvekushandisa zvekutonga seti yemitemo, inobatsira mukushanda kwakatsetseka.

Iyo DELETE RULE SET maitiro, kune rumwe rutivi, inobatanidzwa mukudzima maitiro emitemo seti. Iyo intrinsic maitiro mukati meOracle SQL inoshandiswa kuita Drop Rule Set mashandiro.

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Oracle SQL iine simba programming mutauro unoshandiswa kubata relational database management system (RDBMS). Nhasi, tichaongorora zvakadzama mune imwe pfungwa - iyo SQL Drop Index command.

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Oracle SQL inotibvumira kushandura uye kubata data mune zvehukama dhatabhesi. Mabasa akajairwa anosanganisira kubvunza dhata, kugadzira matafura, uye kugadzira maitiro akaomarara ekugadzirisa data. Rimwe basa rinowanzoitwa nevagadziri neSQL kusarudza mitsara kubva patafura yedatabase. Dzimwe nguva, tingangoda kudzikamisa mitsetse mingani yatiri kusarudza, kazhinji nekuda kwezvikonzero zvekuita. Nekutadza, kana iwe ukanyora chirevo che "SARUDZA" muOracle SQL, inotora mitsara yese kubva patafura yakatarwa inoenderana nemaitiro ako. Asi ko kana tichingoda mitsara gumi yekutanga? Mugwaro iri, ticharatidza nzira yekusarudza chete mitsara gumi yekutanga muOracle SQL.

Sarudza *
KUBVA (SARUDZA *
KUBVA_patafura yako
ORDER BY some_column)
WHERE ROWNUM <= 10; [/code]

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Munyika yeOracle SQL programming, chimwe chezvinhu zvakakosha zvinoda kugadziriswa, zvinosanganisira kutema kwezviitiko kana mashandiro ekunyaradza. Iyo console inoumba chikamu chakakosha chekugadzirisa mafambiro, ichipa vanogadzira nzira yekutevera mashandiro ehurongwa, kusanganisira kuona nzvimbo dzinogona kuitika nyaya. Ichi chinyorwa chinotarisa mune ichi chakakosha-chese chikamu.

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Chokwadi, ngatitaure nezve Oracle SQL maonero uye nezve fashoni mafambiro uye masitayipi. Asi rangarira, nyaya idzi dzakasiyana, saka tichadzibata zvakasiyana.

Oracle SQL's Service Name View : Pfupiso

Iro zita rebasa rekuona chinhu chakakosha cheOracle SQL. Chaizvoizvo, iyo inomiririra inomiririra dhatabhesi, ichishanda sealias yemuenzaniso weOracle dhatabhesi rinoshanda rakati sevhisi. Maonero aya anogonesa kufona maapplication uye vashandisi kuti vabatane uye vadyidzane nedatabase pasina kudiwa kwezita rakajeka remuenzaniso.

Iyo 'Sevhisi Zita Rekuona' inogona kugadzirisa akawanda matambudziko, sekubvumira akawanda akasiyana masevhisi kunanga imwe dhatabhesi kana kufambisa yekubatanidza kuyera kuyera uye kutadza.

GADZIRA KANA KUDZORERA ONA view_service_names AS
SARUDZA zita, db_unique_name, network_name
KUBVA v $ mabasa;

Iyi Oracle SQL kodhi inogadzira maonero emazita ebasa, apo mutsara wega wega unomiririra zita resevhisi rinogonesa kupinda kune Oracle dhatabhesi.

Zita reSevhisi Rinoona Sei Basa muOracle SQL?

Iyo nzira inotanga nekugadzira maonero. Uyu murairo weOracle SQL 'GADZA KANA KUDZORERA MAONERO' unoshandiswa kugadzira maonero matsva, kana kana atovepo, kuitsiva.

Murairo SARUDZA zita, db_unique_name, network_name KUBVA v $ masevhisi; inounganidza mazita ese, mazita edhatabhesi ega ega, uye mazita etiweki kubva kuv$ masevhisi - iyo dynamic performance view inoratidza ruzivo pane ese anoshanda masevhisi.

Mushure mekunge maonero asimbiswa, munhu anogona kuongorora mazita ebasa nekuita zvakajairwa SELECT * FROM view_service_names; query. Mhedzisiro ichave rondedzero yemazita ese azvino masevhisi anogona kukwidziridzwa nekuda kwezvikonzero zvakasiyana.

SARUDZA * KUBVA maonero_service_names;

Mabhenefiti uye Kushandisa Nyaya dzeSevhisi Zita Rekuona

Imwe yemabhenefiti akakosha ekushandisa mazita esevhisi kuita kuti manejimendi ari nyore uye kutonga kweOracle dhatabhesi. Semuenzaniso, inogona kubatsira mukutungamira mabasa kune akakodzera dhatabhesi zviitiko uye kugadzirisa mutengi-parutivi yekubatanidza mutoro kuenzanisa. Imwe bhenefiti kufambisa yekubatanidza kukundikana muReal Application Clusters (RAC) nharaunda.

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Chokwadi, hezvinoi!

Oracle SQL mutauro wepamusoro-soro unopa chikuva chekuita mirairo yeSQL yeOracle dhatabhesi. Inoshandiswa kubata nekushandisa schema zvinhu zvakadai sekugadzira dhatabhesi, kugadzirwa kwekuona, kusikwa kwekutevedzana, kugadzirwa kwemazwi akafanana, uye mamwe mabasa akaomarara. Muchinyorwa chino, tichakurukura imwe yakakosha mashandiro akadai- kuwedzera koramu patafura muOracle SQL.

ALTER TABLE table_name
ADD column_name column_type;

Uyu ndiwo murairo wekutanga waunogona kushandisa kuwedzera koramu kune tafura iripo. Iyo syntax inosanganisira iyo "ALTER TABLE" murairo wekugadzirisa chimiro chetafura, ichitumidza tafura yaunoda kushandura, iyo "ADD" murairo unoudza Oracle kuti uri kuwedzera koramu itsva, uye pakupedzisira zita rekoramu uye chiziviso cherudzi rwekoramu. .

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