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【社内勉強会用】SQLアンチパターン / SQL Antipatterns study
VTRyo
April 12, 2020
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1.1k
【社内勉強会用】SQLアンチパターン / SQL Antipatterns study
2020/4/13 第5章 エンティティ・アトリビュート・バリュー
VTRyo
April 12, 2020
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Transcript
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d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ˞ҙ w ຊࢿྉࣾษڧձͷ՝Ͱ࡞ͨ͠ͷͰ͢ w l42-ΞϯνύλʔϯzΛࢀߟʹ࡞͍ͯ͠·͢ w ͡ΊͯຊॻΛಡΜͰ͍·͢
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW &"7ͱ w ΤϯςΟςΟɾΞτϦϏϡʔτɾόϦϡʔ ʢఆٛରʣɹɹɹʢଐੑʣɹɹʢʣ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW Ξϯνύλʔϯߏ Α͘ݟͨΒ ϯνύλʔϯʹͳͬͯ·ͨ͠ ൚༻తͳଐੑςʔϒϧΛ༻ͪ͠Ό͏ ଐੑΛߦʹ֨ೲͪ͠Ό͏ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ଐੑऔಘ͢Δʹ ΫΤϦ͕ෳࡶʹͳΔ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ඞਢଐੑΛઃఆͰ͖ͳ͍ /05/6--੍Λએݴ͢Δ͚ͩͰ ຊΑ͔ͬͨͷʹʜ ଐੑ͕ ߦʹ֨ೲ͞Ε͍ͯΔ BUUS@OBNFྻʹEBUF@SFQPSUFE͕ೖ͍ͬͯΔߦΛ JTTVF@JE͝ͱʹଘࡏͤ͞Δ੍͕Ϝζ͍
ผʹ·ͱΊͯϨϙʔτΛ࡞Γ͍ͨ ˠʮEBUF@SFQPSUFEͰूܭ͠Αʯ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW σʔλܕΛ͑ͳ͍ %"5&ܕͰྻΛఆٛ͢Ε͍͍ ͚ͩͳͷʹʜ σʔλܕ ͕จࣈྻ ݸผͷBUUS@WBMVFྻΛఆٛ͢Δ͜ͱ͋Δ͕ʜ ΫΤϦෳࡶԽ͢Δ
ผʹ·ͱΊͯϨϙʔτΛ࡞Γ͍ͨ ˠʮEBUF@SFQPSUFEͰूܭ͠Αʯ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ࢀর߹ੑͷڧ੍ෆՄ '03&*(/,&: TUBUVT 3&'&3&/$&4#VH4UBUVT TUBUVT
Ͱ͍͍ͷʹʜ શߦʹ ద༻͞Εͯ͠·͏ '03&*(/,&: BUUS@WBMVF 3&'&3&/$&4#VH4UBUVT TUBUVT TUBUVTଐੑͷ#VH4UBUVTςʔϒϧ͕ ֨ೲ͍ͯ͠Δʹ͍ͨ͠ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW *TTVFΛҰߦͰऔಘ ɾ࠶ߏங͕ඞཁ ɾଐੑ૿Ճʹ݁߹ͷ૿Ճ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ͏Ξϯνύλʔϯ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ΞϯνύλʔϯͰ͍͍ྫ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW &"7Λճආ͠Α͏ ̍ɽͻͱͭͷςʔϒϧʹ αϒλΠϓΛશ෦ೖΕΔ ̎ɽαϒλΠϓ͝ͱʹ ςʔϒϧΛ࡞͢Δ ̏ɽςʔϒϧΛΦϒδΣΫτࢦͷ ΫϥεʹݟཱͯͯܧঝΛ฿͢Δ
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d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ̍ɽγϯάϧςʔϒϧܧঝ w શͯͷଐੑΛ*TTVFͷݸผྻͱͯ֨͠ೲ͢Δ w "DUJWF3FDPSEͱ૬ੑΑ͖ w αϒλΠϓͷগͳ͍ͱ͖ʹ༗ޮ
Q
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d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ̏ɽΫϥεςʔϒϧܧঝ w ͯ͢ͷαϒλΠϓʹڞ௨͢ΔଐੑΛؚΉجఈςʔϒϧ ʢ*TTVFʣΛ࡞Δ w *TTVFςʔϒϧɺ#VHTςʔϒϧɺ'FBUVSF3FRVFTUT ςʔϒϧʹJTTVF@JEΛઃఆ͢Δ
w ͯ͢ͷαϒλΠϓʹڞ௨͢ΔྻΛࢀর͢ΔΫΤϦ͕ස ൟʹ࣮ߦ͞ΕΔͱ͖ʹ༗ޮ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ̐ɽߏԽςʔϒϧ w සൟʹଐੑΛՃ͢Δέʔε-0#ܕʢ-BSHF0CKFDUʣ ΛՃ͠+40/ͳͲͷܗࣜͰ֨ೲ͢Δ w ͲΜͳଐੑͰ֨ೲͰ͖ΔͷͰ֦ுੑ͕ߴ͍ w
ಛఆͷଐੑʹΞΫηε͢Δखஈ͕ͳ͘ɺΞϓϦέʔγϣϯ ίʔυͰղ͢Δඞཁ͕͋Δܽ w αϒλΠϓͷ੍͕ݶͰ͖ͳ͍ɺଐੑఆٛͷॊೈੑ͕ඞཁ ͳ߹ʹ༗ޮ Q
d753ZPQSFTFOUBUJPO NBTUFS 5XJUUFS!T@IW ·ͱΊ w 42-ɺҟͳΔଐੑҟͳΔྻʹ֨ೲ͢Δํ๏ཱ͕֬͞ Ε͍ͯΔ w &"7ͷ࠾༻ɺଐੑΛࣝผ͢ΔͨΊͷ৽ͨͳํ๏Λ42- ্ʹߏங͢Δ͜ͱΛҙຯ͢Δ
w ʮϝλσʔλɺϝλσʔλͷͨΊʹ༻͍·͠ΐ͏ʯ Q
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