SQL SourceTrail

Oracle Application Express, wanda aka fi sani da Oracle APEX, ya sami farin jini sosai a tsakanin masu haɓakawa saboda babban aikin sa da haɗin gwiwar mai amfani. Ƙarfin kayan aiki yana taimakawa wajen haɓaka hadaddun aikace-aikacen gidan yanar gizo wanda ke samun goyan bayan bayanan Oracle. Bugu da ƙari, yanayi ne mai ƙarancin ƙima, yana ba masu haɓakawa damar ƙirƙirar aikace-aikace.

Oracle APEX yana ba da nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan, tare da kowane yana kawo ingantattun fasali da kayan aikin don sauƙaƙe da ingantaccen tsarin ci gaba. Juyin Juyin Halitta na Oracle APEX na iya sa ya zama ƙalubale don bin bambance-bambance tsakanin waɗannan nau'ikan.

Idan aka yi la'akari da sarƙaƙƙiya da ci gaba da juyin Oracle APEX, yana da mahimmanci don fahimtar ayyukan nau'ikan sa. Sau da yawa, masu haɓakawa na iya son tambayar nau'in nau'in Oracle APEX da ake amfani da su don kunna aiki, amfani da faci, ko gyara matsala.

Kara karantawa

Ƙirƙirar jeri wani muhimmin al'amari ne na Oracle SQL. Jeri abubuwa ne na bayanan bayanai waɗanda masu amfani da yawa zasu iya samar da keɓaɓɓen lambobi. Yana yiwuwa a ayyana wasu al'amura kamar ƙimar farko da za a fara da su, girman haɓakawa, da iyakar iyaka, da sauransu. Ana iya amfani da lambobin da aka ƙirƙira ta hanyar jeri don dalilai da yawa kamar ƙirƙirar abubuwan ganowa na musamman, maɓallan farko, lambobin sarrafawa, da ƙari mai yawa.

Kara karantawa

Lokacin aiki tare da bayanan bayanai, aiki na gama gari shine sarrafawa da bincika bayanai don samun fa'ida mai amfani. Sau da yawa, wannan ya haɗa da mu'amala da igiyoyi, musamman ma raba su bisa wasu ƙayyadaddun ƙayyadaddun abubuwa. A cikin Oracle SQL, akwai hanyoyi daban-daban don cika wannan ta ayyuka daban-daban da lambobin tsari. A cikin wannan labarin, za mu rufe cikakken bayani don raba kirtani ta amfani da Oracle SQL. Za mu tattauna ra'ayi, mafita, da kuma rushe lambar mataki-mataki don kyakkyawar fahimta.

Kara karantawa

Saitin Dokokin Drop shine ainihin ra'ayi a cikin Oracle SQL, ana amfani dashi don sarrafa, sarrafa, da tsara saitin bayanai a cikin mahallin bayanai. Yana taimakawa wajen kiyaye ingantaccen tsarin bayanan bayanai ta hanyar ayyana wasu ƙa'idodi waɗanda ke fayyace yadda za'a iya shigo da bayanai, fitarwa, ko share su. A cikin wannan labarin, za mu shiga cikin mahimmancin Saitin Dokokin Drop, jerin ayyukan da ake buƙata don aiwatar da shi, da takamaiman lambar da ke ba ta damar.

A cikin Oracle SQL, Sauke Saitin Doka hanya ce da ake amfani da ita don cire ƙa'idar da aka saita daga ma'ajin bayanai. Ya shafi tsarin bayanai masu sauƙi da hadaddun, yana sa sarrafa bayanai ya zama mai sauƙin sarrafawa. Yana haɓaka aikin bayanai ta hanyar kawar da saitin ƙa'idodin da ba dole ba ko waɗanda aka daina amfani da su da inganta sarrafa bayanai.

DROP RULE SET rule_set_name;

Wannan shine ainihin ma'anar tsarin saitin Dokokin Drop. Rubutun_set_name shine sunan ka'idar da kake son jefawa.

Bayanin lambar mataki-mataki

Yin aikin Saitin Dokokin Drop yana da sauƙi a cikin Oracle SQL. Dukkanin tsarin ya ƙunshi ƙididdige sunan ƙa'idar da aka saita don sharewa tare da ci gaba na "Drop Rule Set".

DROP RULE SET abokin ciniki_dokokin;

Anan, ana yin watsi da ƙa'idar da aka saita mai suna 'customer_rules'.

Yana da mahimmanci a lura cewa kafin a iya yin watsi da tsarin doka, duk abin da aka dogara da shi dole ne a cire shi. Rashin yin hakan zai haifar da kuskure. Bayan tabbatar da cewa babu abin dogaro, zaku iya ci gaba da aikin.

Dakunan karatu da Ayyuka masu alaƙa

Oracle SQL yana ba da ɗimbin ɗakunan karatu da ayyuka waɗanda zasu iya shiga cikin wasa yayin amfani da Saitin Dokokin Drop, kamar fakitin DBMS_RULE da tsarin GAME DA RULE SET.

Kunshin DBMS_RULE babban ɗakin karatu ne mai fa'ida mai fa'ida don sarrafa tsarin mulki. Yana ba masu haɓakawa da fasalulluka masu amfani don sarrafa saiti na ƙa'ida, suna taimakawa cikin ayyuka masu santsi.

Hanyar DELETE RULE SET, a gefe guda, tana cikin aikin sharewa don saitin ƙa'ida. Hanya ce mai mahimmanci a cikin Oracle SQL da aka yi amfani da ita don aiwatar da Ayyukan Saitin Dokokin Drop.

Kara karantawa

Oracle SQL harshe ne mai ƙarfi na shirye-shirye da ake amfani da shi don sarrafa tsarin sarrafa bayanai (RDBMS). A yau, za mu zurfafa zurfi cikin takamaiman ra'ayi - umarnin SQL Drop Index.

Kara karantawa

Oracle SQL yana ba mu damar sarrafa bayanai da sarrafa bayanai a cikin bayanai masu alaƙa. Ayyukan gama gari sun haɗa da tambayar bayanai, ƙirƙirar teburi, da haɓaka hadaddun tsarin sarrafa bayanai. Ɗaya daga cikin ɗawainiya akai-akai wanda masu haɓakawa ke cim ma tare da SQL shine zaɓar takamaiman layuka daga teburin bayanai. Wani lokaci, muna iya buƙatar iyakance yawan layuka da muke zaɓa, sau da yawa saboda dalilan aiki. Ta hanyar tsohuwa, lokacin da kuka rubuta bayanin "SELECT" a cikin Oracle SQL, yana dawo da duk layuka daga teburin da aka keɓe wanda ya dace da ma'aunin ku. Amma idan kawai muna son layuka 10 na farko fa? A cikin wannan jagorar, za mu nuna yadda ake zaɓar layuka 10 na farko a Oracle SQL.

Zaba *
DAGA (ZABI *
DAGA teburin ku
TAKARDAR ODAR XNUMXADXNUMX ZAMA AIKATA?
INA RAWA NUM <= 10; [/kodi]

Kara karantawa

A cikin duniyar shirye-shiryen Oracle SQL, ɗayan mahimman abubuwan da ake buƙatar magance su, sun haɗa da shigar da abubuwan da suka faru ko ayyuka don ta'aziyya. Na'urar wasan bidiyo ta samar da wani muhimmin sashi na aikin gyara kurakurai, yana samar da masu haɓaka hanya don bin tsarin aiki, gami da gano wuraren da za a iya samun matsala. Wannan labarin ya zurfafa cikin wannan muhimmin al'amari.

Kara karantawa

Tabbas, bari muyi magana game da ra'ayin Oracle SQL da kuma game da yanayin salo da salo. Amma ku tuna, waɗannan batutuwa sun bambanta sosai, don haka za mu magance su daban.

Duba Sunan Sabis na Oracle SQL : Bayani

Duba sunan sabis wani muhimmin al'amari ne na Oracle SQL. Ainihin, wakilcin ma'ana ne na bayanan bayanai, yana aiki azaman laƙabi don misalin bayanan Oracle yana gudanar da takamaiman sabis. Wannan ra'ayi yana ba da damar aikace-aikacen kira da masu amfani don haɗawa da yin hulɗa tare da bayanan bayanai ba tare da buƙatar takamaiman sunan misali ba.

The 'Duba Sunan Sabis' na iya magance matsaloli da yawa, kamar ƙyale ayyuka daban-daban don ƙaddamar da bayanai guda ɗaya ko sauƙaƙe daidaita nauyin haɗi da gazawar.

Ƙirƙiri KO MASA DUBI view_service_names AS
SELECT name, db_unique_name, network_name
DAGA ayyuka v$;

Wannan lambar Oracle SQL tana haifar da kallon sunayen sabis, inda kowane jere ke wakiltar sunan sabis wanda ke ba da damar shiga bayanan Oracle.

Yaya Duba Sunan Sabis ke Aiki a Oracle SQL?

Tsarin yana farawa ta hanyar ƙirƙirar kallo. Ana amfani da wannan umarni na Oracle SQL 'CREATE KO REPLACE VIEW' don ƙirƙirar sabon ra'ayi, ko kuma idan ya riga ya wanzu, don maye gurbinsa.

Umurnin SELECT sunan, db_unique_name, network_name DAGA ayyuka v$; yana tara duk sunaye, sunaye na musamman na bayanan bayanai, da sunayen cibiyar sadarwa daga ayyuka v$ - yanayin aiki mai ƙarfi yana nuna bayanai akan duk ayyuka masu aiki.

Bayan an kafa ra'ayi, mutum zai iya bincika sunayen sabis ta hanyar aiwatar da daidaitaccen SELECT * FROM view_service_names; tambaya. Sakamakon zai zama jerin duk sunayen sabis na yanzu waɗanda za a iya amfani da su don dalilai daban-daban.

Zaɓi * DAGA sunayen_sabis na kallo;

Fa'idodi da Amfani da Sharuɗɗan Duban Sunan Sabis

Ɗaya daga cikin mahimman fa'idodin amfani da sunayen sabis shine ba da damar gudanarwa cikin sauƙi da sarrafa bayanan bayanan Oracle. Misali, yana iya taimakawa wajen sarrafa nauyin aiki zuwa misalan bayanan da suka dace da daidaita ma'auni na haɗin haɗin abokin ciniki. Wani fa'ida shine sauƙaƙe gazawar haɗin gwiwa a cikin mahallin Rukunin Aikace-aikacen Real (RAC).

Kara karantawa

Tabbas, a nan za mu tafi!

Oracle SQL babban yare ne wanda ke ba da dandamali don aiwatar da umarnin SQL don bayanan Oracle. Ana amfani da shi don sarrafa da sarrafa abubuwan ƙirƙira kamar ƙirƙira bayanan bayanai, ƙirƙirar duba, ƙirƙirar jeri, ƙirƙirar ma'ana, da sauran hadaddun ayyuka. A cikin wannan labarin, za mu tattauna ɗaya irin waɗannan mahimman ayyuka - ƙara shafi zuwa tebur a cikin Oracle SQL.

ALTER TABLE table_name
ADD column_name column_type;

Wannan shi ne ainihin umarni da za ku iya amfani da su don ƙara shafi zuwa tebur mai gudana. Rubutun ya haɗa da umarnin “ALTER TABLE” don gyara tsarin teburin, sanya sunan tebur ɗin da kuke son canzawa, umarnin “ADD” wanda ke gaya wa Oracle cewa kuna ƙara sabon shafi, kuma a ƙarshe sunan shafi da sanarwar nau'in shafi. .

Kara karantawa