An warware: duban sigar koli

Oracle Application Express, wanda aka fi sani da Oracle APEX, ya sami farin jini sosai a tsakanin masu haษ“akawa saboda babban aikin sa da haษ—in gwiwar mai amfani. ฦ˜arfin kayan aiki yana taimakawa wajen haษ“aka hadaddun aikace-aikacen gidan yanar gizo wanda ke samun goyan bayan bayanan Oracle. Bugu da ฦ™ari, yanayi ne mai ฦ™arancin ฦ™ima, yana ba masu haษ“akawa damar ฦ™irฦ™irar 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 sauฦ™aฦ™e da ingantaccen tsarin ci gaba. Juyin Juyin Halitta na Oracle APEX na iya sa ya zama ฦ™alubale don bin bambance-bambance tsakanin waษ—annan nau'ikan.

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

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An warware: tsaga kirtani

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 haษ—a da mu'amala da igiyoyi, musamman ma raba su bisa wasu ฦ™ayyadaddun ฦ™ayyadaddun 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.

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An warware: ฦ™irฦ™irar jeri

ฦ˜irฦ™irar jeri wani muhimmin al'amari ne na Oracle SQL. Jeri abubuwa ne na bayanan bayanai waษ—anda masu amfani da yawa zasu iya samar da keษ“aษ“ษ“en lambobi. Yana yiwuwa a ayyana wasu al'amura kamar ฦ™imar farko da za a fara da su, girman haษ“akawa, da iyakar iyaka, da sauransu. Ana iya amfani da lambobin da aka ฦ™irฦ™ira ta hanyar jeri don dalilai da yawa kamar ฦ™irฦ™irar abubuwan ganowa na musamman, maษ“allan farko, lambobin sarrafawa, da ฦ™ari mai yawa.

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An warware: sql drop index

Oracle SQL harshe ne mai ฦ™arfi 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.

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An warware: saitin ฦ™a'ida

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 ฦ™a'idodi waษ—anda 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 buฦ™ata 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 ฦ™a'idar da aka saita daga ma'ajin bayanai. Ya shafi tsarin bayanai masu sauฦ™i da hadaddun, yana sa sarrafa bayanai ya zama mai sauฦ™in sarrafawa. Yana haษ“aka aikin bayanai ta hanyar kawar da saitin ฦ™a'idodin da ba dole ba ko waษ—anda 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 sauฦ™i a cikin Oracle SQL. Dukkanin tsarin ya ฦ™unshi ฦ™ididdige sunan ฦ™a'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 ฦ™a'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 alaฦ™a

Oracle SQL yana ba da ษ—imbin ษ—akunan karatu da ayyuka waษ—anda 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 ษ—akin karatu ne mai fa'ida mai fa'ida don sarrafa tsarin mulki. Yana ba masu haษ“akawa da fasalulluka masu amfani don sarrafa saiti na ฦ™a'ida, suna taimakawa cikin ayyuka masu santsi.

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

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An warware: sql log don ta'aziyya

A cikin duniyar shirye-shiryen Oracle SQL, ษ—ayan mahimman abubuwan da ake buฦ™atar magance su, sun haษ—a 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 haษ“aka hanya don bin tsarin aiki, gami da gano wuraren da za a iya samun matsala. Wannan labarin ya zurfafa cikin wannan muhimmin al'amari.

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An warware: zaษ“i layuka 10 na farko

Oracle SQL yana ba mu damar sarrafa bayanai da sarrafa bayanai a cikin bayanai masu alaฦ™a. Ayyukan gama gari sun haษ—a da tambayar bayanai, ฦ™irฦ™irar teburi, da haษ“aka hadaddun tsarin sarrafa bayanai. ฦŠaya daga cikin ษ—awainiya akai-akai wanda masu haษ“akawa ke cim ma tare da SQL shine zaษ“ar takamaiman layuka daga teburin bayanai. Wani lokaci, muna iya buฦ™atar iyakance yawan layuka da muke zaษ“a, 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 keษ“e 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 zaษ“ar layuka 10 na farko a Oracle SQL.

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

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An warware: duba sunan sabis

Tabbas, bari muyi magana game da ra'ayin Oracle SQL da kuma game da yanayin salo da salo. Amma ku tuna, waษ—annan 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 laฦ™abi don misalin bayanan Oracle yana gudanar da takamaiman sabis. Wannan ra'ayi yana ba da damar aikace-aikacen kira da masu amfani don haษ—awa da yin hulษ—a tare da bayanan bayanai ba tare da buฦ™atar takamaiman sunan misali ba.

The 'Duba Sunan Sabis' na iya magance matsaloli da yawa, kamar ฦ™yale ayyuka daban-daban don ฦ™addamar da bayanai guda ษ—aya ko sauฦ™aฦ™e daidaita nauyin haษ—i da gazawar.

ฦ˜irฦ™iri 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 ฦ™irฦ™irar kallo. Ana amfani da wannan umarni na Oracle SQL 'CREATE KO REPLACE VIEW' don ฦ™irฦ™irar 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 ฦ™arfi 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 waษ—anda za a iya amfani da su don dalilai daban-daban.

Zaษ“i * DAGA sunayen_sabis na kallo;

Fa'idodi da Amfani da Sharuษ—ษ—an Duban Sunan Sabis

ฦŠaya daga cikin mahimman fa'idodin amfani da sunayen sabis shine ba da damar gudanarwa cikin sauฦ™i da sarrafa bayanan bayanan Oracle. Misali, yana iya taimakawa wajen sarrafa nauyin aiki zuwa misalan bayanan da suka dace da daidaita ma'auni na haษ—in haษ—in abokin ciniki. Wani fa'ida shine sauฦ™aฦ™e gazawar haษ—in gwiwa a cikin mahallin Rukunin Aikace-aikacen Real (RAC).

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An warware: ฦ™ara shafi

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 ฦ™irฦ™ira kamar ฦ™irฦ™ira bayanan bayanai, ฦ™irฦ™irar duba, ฦ™irฦ™irar jeri, ฦ™irฦ™irar ma'ana, da sauran hadaddun ayyuka. A cikin wannan labarin, za mu tattauna ษ—aya irin waษ—annan mahimman ayyuka - ฦ™ara 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 ฦ™ara shafi zuwa tebur mai gudana. Rubutun ya haษ—a da umarnin โ€œALTER TABLEโ€ don gyara tsarin teburin, sanya sunan tebur ษ—in da kuke son canzawa, umarnin โ€œADDโ€ wanda ke gaya wa Oracle cewa kuna ฦ™ara sabon shafi, kuma a ฦ™arshe sunan shafi da sanarwar nau'in shafi. .

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