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SQLアンチパターン勉強会 #2
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yusuke sasajima
December 12, 2013
Programming
0
340
SQLアンチパターン勉強会 #2
やっと第二回開催。。。
資料作るの大変だけど、たのしす〜
yusuke sasajima
December 12, 2013
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Transcript
SQLΞϯνύλʔϯ #2 ॓ധࣄۀຊ෦γεςϜ։ൃ෦ ౡ༞հʢ!TJTJKVNJʣ
ຊͷΞδΣϯμ ˔ɹ͡Ίʹʢʣ ɹࢿྉΛ࡞ͬͯΈͯ ͔͔࣌ؒΔ ɹୈࡾճ୭͕Δͷʁʁ ˔ɹຊฤʢʣ ɹষɿΠϯσοΫεγϣοτΨϯʢҋӢʣ ˔ɹΈΜͳͰ͓ʢʣ
ΠϯσοΫεγϣοτΨϯʁ
ΠϯσοΫεͷత w ύϑΥʔϚϯεʂ w ύϑΥʔϚϯεʂʂ w ύϑΥʔϚϯεʂʂʂ w ͯ͢ੑೳͷͨΊ
ΠϯσοΫεΛཧղ͠ͳ͍· ·ͩͱɻɻɻ w ΠϯσοΫεΛ·ͬͨ͘ఆٛ͠ͳ͍͔ɺ গ͚ͩ͠ఆٛ͢Δ͜ͱʹͳΔ w ΠϯσοΫεΛଟ͘ఆٛ͗͢͠Δ͔ɺ ཱͨͳ͍ΠϯσοΫεΛఆٛ͢ΔʢΠϯ σοΫιʣ w
ΠϯσοΫεΛ׆༻͠ͳ͍ΫΤϦΛ࣮ߦ ͯ͠͠·͏
͓͞Μɺ ΠϯσοΫε ͬͯʁ
ΠϯσοΫεͱ දྫ w #5SFFΠϯσοΫε w ϏοτϚοϓΠϯσοΫε w ؔΠϯσοΫεʢ0SBDMF͚ͩʣ w ྻετΞΠϯσοΫε
ΠϯσοΫεͱ
ΠϯσοΫεͷҙ ΠϯσοΫεΛར༻ͯ͠ৗʹ͘ ͳΒͳ͍ w औಘϨίʔυ શମͷҎԼɿΠϯσοΫεΛ༻ͨ͠ํ͕͍ શମͷˋΛ͑ͨɿςʔϒϧϑϧεΩϟϯ͕͍ ˞
ҰൠతʹdͷൣғʢΒ͍͠Ͱ͢ʣ
ΧόϦϯάΠϯσοΫεʁ w ຊདྷͷΠϯσοΫεʹෆཁͳྻΛఆٛ ɹ࡞ྫ $SFBUF*OEFYCVHDPWFSSJOHPOCVT TUBUVT CVH@JE EBUF@SFQPSUFE@CZ
TVNNBSZ ! 4FMFDUTUBUVT CVE@JE EBUF@SFQPSUFE TVNNBSZ 'SPN#VHT8IFSFTUBUVTbPQFO` ! ॓ധͩͱ༧ςʔϒϧͱ͔ͰΠϝʔδ͍͢͠
Ξϯνύλʔϯᶃ ΠϯσοΫεΛશ͘ఆٛ͠ͳ͍ w ΠϯσοΫεΛѱͩͱߟ͑ͯ͠·͏ ʮͳΜ͔ɺΦʔόʔϔου͕ൃੜ͢ΔΒ ͍͠͡ΌΜɻʯ w ͋·ΓΒͳ͍ͷʹɺΦʔόʔϔου ͱ͍͏୯ޠ͚ͩͰఆٛ͠ͳ͍ ϞολΠφΠʂʂ
Ξϯνύλʔϯᶄ ΠϯσοΫεΛଟ͘ఆٛ͗͢͠Δ DSFBUFUBCMFCVHT CVE@JE 4&3*"-13*."3:,&:
EBUF@SFQPSUFE %"5&/05/6-- TVNNBSZ WBSDIBS TUBUVT IPVST */%&9 CVH@JE */%&9 TVNNBSZ */%&9 IPVST */%&9 CVE@JE EBUF@SFQPSUFE TUBUVT
Ξϯνύλʔϯᶄ ΠϯσοΫεΛଟ͘ఆٛ͗͢͠Δ DSFBUFUBCMFCVHT CVE@JE 4&3*"-13*."3:,&:
EBUF@SFQPSUFE %"5&/05/6-- TVNNBSZ WBSDIBS TUBUVT IPVST */%&9 CVH@JE */%&9 TVNNBSZ */%&9 IPVST */%&9 CVE@JE EBUF@SFQPSUFE TUBUVT ෳ߹ΠϯσοΫεࠨ͔ΒߜΓࠐ·ΕΔ͔Βແବ PKࣗಈੜ͞Ε͍ͯΔ ΠϯσοΫεલํҰகͷΈ༗ޮͷͨΊɺ! ແବʹͳΔՄೳੑ͕ߴ͍
Ξϯνύλʔϯᶅ ΠϯσοΫεཱ͕ͨͳ͍ʢΠϯσοΫιʣ ΠϯσοΫεΛ͑ͳ͍ΫΤϦΛ࣮ߦ͢Δ͜ͱ ຐ๏ͷΑ͏ͳྻͷΈ߹Θͤ ΠϯσοΫεͷΦϓγϣϯ खΓ࣍ୈʹΠϯσοΫεΛ࡞ͯ͠͠·͏ ։ൃऀ
None
͍͑ɺ͋ͳͨͷ͜ͱͰ͢ɻ
Ξϯνύλʔϯᶅ ΠϯσοΫεཱ͕ͨͳ͍ʢΠϯσοΫιʣ ిாͰྫ͑Δʢ໊ࣈɺ໊લͷॱʹฒΜ Ͱ͍Δʣͱ ໊ࣈɿνϟʔϧζʢ˕ɿ͙͢ݟ͔ͭΔʣ ໊લɿνϟʔϧζʢºɿ͔͔࣌ؒΔʣ
ిாͷࡧҾΛ۩ମతʹॻ͍ͯΈ·ͨ͠ɻ $ νϟʔϧζɾέϯεέ νϟʔϧζɾϢεέ νϟʔϧζɾνϟʔϧζ % σϏοτɾνϟʔϧζ σϏοτɾϕοΧϜ ̚ ΤϦοΫɾνϟʔϧζ
' ϑΥϨετɾΨϯϓ ϑΥʔϦϯɾὑ ϑΥΧονϟɾνϟʔϧζ ϝϦοτΛಘΒΕͳ͍ΠϯσοΫε $3&"5&*/%&95FMFQIPOF#PPL PO"DDPVOUT MBTU@OBNF pSTU@OBNF !
Ξϯνύλʔϯͷݟ͚ͭํ ࣍ͷݴ༿ʹؾΛ͚ͭΔ ʮ͜ͷΫΤϦΛߴԽ͍ͨ͠Μ͚ͩͲɺͲ͏͢Ε͍͍ʁʯ ୭͔ʹ૬ஊ͢Δ ʮϑΟʔϧυશ෦ʹΠϯσοΫεΛఆٛͨ͠ͷʹɺͳ࣮ͥߦ ͕͘ͳΒͳ͍ͷͩΖ͏ʁʯ έʔεᶄʹ֘ ʮσʔλϕʔεΛ͘͢Δͱॻ͍͍ͯΔͷΛԿ͔ͰಡΜͩ͜ͱ͕ ͋ΔɻͦΕҎདྷɺΠϯσοΫεΘͳ͍Α͏ʹ͍ͯ͠Δʯ έʔεᶃʹ֘
Ͳ͏ͯͦ͠͏ͳΔʁ w ΠϯσοΫεʹ͍ͭͯΒͳ ͍ʢ·͔ͨͬͨͿΓΛ͠ ͍ͯΔʣ w ߟ͍͑ͯͳ͍ʢߟ͑Δ͜ͱΛ ์غ͍ͯ͠Δʣ w ΠϯσοΫεʹؔͯ͠૬ஊͰ
͖Δਓ͕͍ͳ͍
ίϥϜʣબੑʹ͍ͭͯ w બ੍ͱʁ σʔλϕʔεΠϯσοΫεʹ͍ͭͯͷ౷ ܭ ςʔϒϧͷ૯ߦʹ͍ͨ͢ΔΠϯσοΫ εͷதͷݸผͷͷͷׂ߹
TFMFDU DPVOU EJTUJODUTUBUVT DPVOU TUBUVT BTTFMFDUJWJUZ 'SPN#VHT
બੑͷΠϯσοΫε ͷछྨ͕গͳ͍ΧϥϜʹ͍ͭͯɺΠϯ σοΫεΛ࡞ͯ͠ʹཱͨͳ͍ ྫʣੑผɺྸͳͲ
None
ΞϯνύλʔϯΛ ༻͍ͯΑ͍߹
͑ɺɺɺͦΜͳ͜ͱ ͍͍ͯ͠ͷʁ
͍͍ΜͰ͢ʂʂʂ
͍ɺΑ͘ͳ͍Ͱ͠ΐ ʢসʣ
࠷ॳΈΜͳΘ͔Βͳ͍ w ͲͷΑ͏ͳΫΤϦ͕࣮ߦ͞ΕΔ͔Θ͔Βͳ͍ w ΫΤϦ͕Θ͔Βͳ͍͔Βɺ࠷దͳΠϯσοΫ ε࡞Εͳ͍ w ࡞ͨ͠ޙͰɺෆཁʹͳΔέʔεଘࡏͯ͠ ͍Δ Ͱ͖ΔݶΓɺेͳใʹج͍ͮͯݕ౼͠Α
͏
ʮ.&/503ʯͷݪଇ w .FBTVSFʢଌఆʣ w &YQMBJOʢղੳʣ w /PNJOBUFʢࢦ໊ʣ w 5FTUʢςετʣ w
0QUJNJ[Fʢ࠷దԽʣ w 3FCVJMEʢ࠶ߏஙʣ
.FBTVSFʢଌఆʣ w 42-ͷΫΤϦ࣮ߦ࣌ؒΛଌఆ͢Δ w ࠷ଟ͘ͷ࣌ؒΛফඅ͢ΔΫΤϦΛಛ ఆ ˞Ωϟογϡແޮʹͯ͠ w
ϓϩϑΝΠϦϯάʹΑͬͯɺΑΓਖ਼֬ ͳใ͕औಘՄೳ
&YQMBJOʢੳʣ w ΫΤϦ࣮ߦܭը ʢ2VFSZ&YFDVUJPO1MBOɿ2&1ʣʹΑ ΔੳΛ࣮ࢪ w .JDSPTPGU42-4FSWFS 4&54)081-"/@9.-
/PNJOBUFʢࢦ໊ʣ w ΫΤϦͷ2&1ΛಡΜͰɺΠϯσοΫεΛ Θͳ͍ͰςʔϒϧʹΞΫηε͍ͯ͠Δ ՕॴΛ୳ͤʂ w ϕϯμʔ͝ͱʹศརͳπʔϧ͕͋Δ͔Βɺ ͦΕΛͬͯΈΑ͏ w .JDSPTPGU
42-4FSWFS%BUBCBTF&OHJOF5VOJOH"EWJTPS
5FTU w ࠶ͼΫΤϦͷϓϩϑΝΠϦϯά w มߋ͕ͨΒͨ͜͠ͱΛ֬ೝ͔ͯ͠Β ࡞ۀ͢Δ
0QUJNJ[Fʢ࠷దԽʣ w ͳΔ͖ΩϟογϡϝϞϦʹͷͤΑ͏ ˞ͨͩ͠ɺͦΕ͓͍ͷγεςϜʹ ґଘ͠·͢ w ΠϯσοΫεΛ͋Β͔͡ΊΩϟογϡʹ ͷͤΔͱϝϦοτ͕ಘΒΕΔέʔε
.Z4RMɿ-0"%*/%&9*/50$"$)&
3FCVJMEʢ࠶ߏஙʣ w ΠϯσοΫεߦͷߋ৽আʹΑͬ ͯɺ࣍ୈʹෆۉߧʹ ϦϏϧυ͠·͠ΐ͏ w .JDSPTPGU "-5&3*/%&9ʜ3&$03(/*;&
ΠϯσοΫεͲ͏͚ͭΔ͔ͬ ͯɺ͍͠Ͷ ᶃΠϯσοΫε͕༻͞ΕΔՄೳੑ͕ߴ͍߹ͷΈઃ ఆ͢ΔΑ͏ʹઃܭ͢Δ ӡ༻தͷύϑΥʔϚϯεվળΛߦ͍ͭͭɺඞཁͳΠϯσοΫεͷΈઃఆ͍ͯ͘͠ ᶄଟগͯ͘ઃఆ͢ΔΑ͏ʹઃܭ͢Δ ଟগΠϯσοΫε͕ແବʹͳͬͯํ͕ͳ͍͕ɺӡ༻தͷύϑΥʔϚϯεվળͷػձΛ͋ ·Γ࣋ͨͳͯ͘ྑ͍Α͏ʹ͢Δ ! ྆ํΔ͠
·ͱΊ w ਪଌͷΈʹج͍ͮͯɺҋӢʹΠϯσοΫεΛͭ ͚͍͚ͯͳ͍ w ΠϯσοΫεΛཧղ͠ͳ͍··ɺ༻Մ൱Λ அ͍͚ͯ͠ͳ͍ w কདྷతͳσʔλྔͳͲɺΠϯσοΫεΛ༧ଌ͢ Δͷ͚ͬ͜͏͠ΜͲ͍
w .&/503ͷݪଇʹج͍ͮͯɺΠϯσοΫεΛ ཧ͢Δ
ΠϯσοΫ εͱྑ͘ Ͷʂʂ