MySQL - uiui i roto i te uiui. MySQL: uiui tauira. pātai MySQL Tāmau

I tēnei wā, ka taea e te tangata i ia mau i te tupu tere o ngā mōhiohio mamati. A, mai te nui o tenei kōrero ko nui, he mea e tika ana ki te tiaki i te reira i roto i te puka mamati mō te whakamahi heke mai. I roto i tenei āhuatanga, e taea te whakamahi i te reira hangarau hou pērā i ngā pātengi raraunga. whakarato ratou e taea te whakamana rokiroki pono o tetahi mōhiohio me te raraunga uru mamati i tetahi wāhi i runga i te ao. Ko tētahi o nga hangarau i raro i whakaaro ko te pūnaha o pātengi raraunga MySQL.

DBMS MySQL - he aha te mea tenei?

He tūhonohono pūnaha whakahaere pātengi raraunga MySQL ko tetahi o te hangarau rokiroki tino rongonui, me te nuitia whakamahia. He pai tōna taumahinga i roto i te tikanga he maha te pātengi raraunga e tīariari ana. I roto i ngā, tetahi o nga āhuatanga matua ko te kaha ki te whakamahi i tāmau pātai MySQL.

Na reira, he tokomaha o nga kaupapa, kei hea he nui, me te tika te wā ki te whakarite i te rokiroki ngā mōhiohio mahi, me te mahi tauira raraunga matatini e te whakawhanakehia i runga i te pātengi raraunga MySQL. Te nuinga o enei whanaketanga hanga tukutuku. I roto i tenei take, kei te whakatairangatia ana MySQL i te whakatinanatanga o te iti (blogs, paetukutuku, kāri pakihi, me te pera i runga i. P.) Na raruraru kaua nui (hokohoko online, rokiroki raraunga , a na i runga i. D.). I roto i te wā e rua, te whakaatu o ngā kōrero i runga i te whārangi tukutuku whakamahia MySQL-uiui. Ko te tono mō ngā ngana ki te hanga i te nuinga o te whai wāhitanga e patua ana Pūnaha Whakahaere Database.

kia pehea kia whakaritea reira rokiroki

Hoki te rokiroki watea, me te tukatuka muri o te raraunga whakahau tika. Ko te hanganga raraunga ki te whakatau me pehea e titiro te tepu rite, e kua whakamahia ki te rokiroki i ngā mōhiohio. tepu Pātengi Raraunga Ko te huinga o ngā āpure (tīwae) e ōrite ana hoki ia taonga motuhake o te ahanoa raraunga.

Hei tauira, ki te te tepu o kaimahi o te kamupene ngā, ko reira ka waiho i te hanganga tino ohie e whai ake. Hoki ia kaimahi piri te tau ahurei, e te nuinga o te wā e whakamahia ana rite te kī tuatahi ki te tepu. Na i roto i te ripanga e tuhia raraunga kaimahi whaiaro. E nehenehe te reira tetahi mea: ingoa katoa, te tau kāri, hoki nei te whakaritea ai, waea, wāhitau me te tahi atu taipitopito. E ai ki nga whakaritenga o te māori (6 ngā noa o pātengi) rite te pai kia rite ki mo MySQL-uiui kapi kia mara hanganga o te tepu ngota, e ko, e kore ki te whai enumerations rārangi ranei. Na reira, te tikanga, i roto i te tepu, i reira he mara motuhake mō te ingoa whakamutunga, ingoa tuatahi, a na i runga i. D.

Runga ake ko te tauira faufaa o te hanganga tepu pātengi raraunga. Heoi, he tonu reira e kore te whakatau tino nga whakaritenga faufaa o te māori. I roto i ngā pūnaha tūturu, hanga he atu wāhanga tepu. Na reira, ko te tepu e whai ake hei utu o nga kupu me te maha o ngā tari i roto i "Tari" tīwae.

Kia pehea te Ko te tauira raraunga

Hei tiki raraunga i tepu i roto i te pūnaha whakahaere pātengi raraunga MySQL, he rōpū motuhake - Tīpakohia rapu. Ki te tūmau pātengi raraunga tika ähua ki te tono, te tono me te pai-i hanga. i hanga hanganga rapu te e whai ake. Tetahi uru ki te tūmau pātengi raraunga tīmata ki te kupu matua tīpako. I reira ki a ia hanga katoa pātai MySQL. Ka taea e tauira kia o whīwhiwhi rerekē, engari he tino rite te parau tumu o te hanga.

Na e hiahia ana koe ki te whakapūtā e āpure e hiahia ana koe ki te tīpako i te mōhiohio e hiahiatia ana. Rārangi nga mara haere i roto i te piko i muri i te mau mana'o tauturu tīpako. Kia kua mara hiahiatia katoa i tabulahia i roto i te tono āta te ahanoa tepu i ai e puta te tauira ki te awhina o whakaaro i a whakapūtā te ingoa o te tepu.

Hoki whāititanga tīpako i MySQL-uiui e tapiritia ki ngā motuhake, ngā te pātengi raraunga. Hoki tauira faito taa (ahurei) raraunga whakamahia karangatia motuhake, me ki whakaturia tikanga - te kaiwhakahaere i reira. Ka rite ki te tauira e hāngai ana ki te tepu i runga, ka taea e tatou whakaaro te tono tono mōhiohio o Ingoa kaimahi e mahi ana i roto i te tari "Sales". hanganga rapu e te puka rite i roto i te ripanga i raro nei.

Ko te ariā o te uiui whakautu

Ko te āhuatanga matua o te pātengi raraunga, rite whakahuatia i runga ake, te kaha ki te hapai i tāmau MySQL uiui. kia titiro te reira rite? Mai i te ingoa arorau mohio e ko he tono hangaia i roto i te raupapatanga o e rua, neke atu rānei tono tenei. I roto i te ariā, i te ako i te peculiarities o pātengi raraunga reira ta e kore e MySQL whakawhāiti te maha o MySQL-uiui e taea te ohanga e i roto i te uiui matua. Heoi, ka taea e koe te whakamātau i roto i ngā mahi, me te kia e i muri te rua o te wa whakautu tekau rapu whakautu ki te whakapiki ake i tino. I roto i tetahi take, i roto i te mahi i reira he raruraru e hiahia ki te whakamahi i te rawa matatini MySQL-uiui. kia rapua e te tono he mōrahi o 3-5 aroākapa tauroto.

Construction o uiui tauroto

I roto i te tātari o te mōhiohio pānui, ka taea te whakamahi i te maha o ngā pātai e pā ana ki te wahi i te iti-pātai, me te mea e koutou e taea e kore whakaoti i te raruraru o te wehewehe ratou ki ohie i waho te fifi i te hanganga. I roto i te mahi, kei te whakamahia iti-uiui ki te whakaoti rapanga matatini. Taua momo o raruraru he āhuatanga ka kore te mea mohiotia i roto i mua i te tikanga i raro i nei uara te rohe e puta atu tīpako. E kore e taea ki te whakaoti i taua raruraru, ki te koutou te whakamahi tika i te auau MySQL-uiui. I roto i te tono, arā, o te nahanaha, ka hei here rapu e kia huri ki runga i te wā i roto i te mua ranei, e kore e taea te mohiotia.

Ki te whakaaro tatou ki te tepu i runga, te tauira e whai ake nei ko te mahi matatini. Kia mea a hiahia tatou ki te mohio ngā mōhiohio taketake e pā ana ki ngā kaimahi e e kaimahi Grishina Grigoriya Grigorevicha, e ko te upoko o hoko. I roto i te hanga i te uiui e kore matou e mohio ki tona tau tāututanga. Na te tīmatanga Me tatou ki mohio i te reira. whakamahi te reira i te uiui ohie e ka kitea i te ngā matua o te whakatau, a ka kīnaki i te matua MySQL-uiui. mārama whakaatu ana te tono e whiwhi i te subquery te tau kaimahi ID, e tautuhi anō te rohe o te rapu matua:

I roto i tenei take, e whakamahia ana i tetahi mana'o te ki te ārai i te takanga o ngā hapa, ki te ka waiho i te torutoru kaimahi ki taua waitohu.

hua

Hei whakarāpopoto, kia tuhia te reira e reira e maha atu āhuatanga atu e nui whakahaere te hanga o te uiui, ka rite ki DBMS MySQL - he taputapu kaha ki te whānui o ngā taputapu mō te rokiroki me te tukatuka ngā.