SQL - ?????? ?? ?????
0 likes4,501 views
????? ????? ?????? ?? ?????, ???? ???????, ?????? ???????
![[系列活動] Python 爬蟲實戰](https://cdn.slidesharecdn.com/ss_thumbnails/pythonafunjimv1-171213041823-thumbnail.jpg?width=560&fit=bounds)
![[DLHacks]Comet ML -機械学習のためのGitHub-](https://cdn.slidesharecdn.com/ss_thumbnails/180625dlhacksltcometml-180629052128-thumbnail.jpg?width=560&fit=bounds)
![[DL輪読会]Graph R-CNN for Scene Graph Generation](https://cdn.slidesharecdn.com/ss_thumbnails/graphr-cnnforscenegraphgenerationkobayashi1130-181130001547-thumbnail.jpg?width=560&fit=bounds)
![[DL輪読会]High-Quality Self-Supervised Deep Image Denoising](https://cdn.slidesharecdn.com/ss_thumbnails/high-qualityself-superviseddeepimagedenoising-200501014639-thumbnail.jpg?width=560&fit=bounds)
More Related Content
What's hot (20)
More from ???? ?????? (20)
SQL - ?????? ?? ?????
- 1. ??????? ?? ?????.? ???????:? ?- ? – N??? ???? ??? ???? ????? ?????? ??? ??? ????? ?? ??????.? ????? (? )domain???? ????? ?????? ??????? ???? ????? ??????, ????? ?Di?? ?-? ?- ? – N??? ????? ???? ?? ??, ???? ?????? (? )V1,V2,…Vn????? ?.ViDi?? ???????:? ?????? – ?( σ - SELECT????? ? – ? WHERE?? – ?)SQL?? ?-? ???????? ???: (?σ column=value )table_name?? ??????: (?( σ branch_name="Aviv" )borrow?????? ?? ?????? ??? ?? ????? ????)? ????? – ?( ? – Project????? ? – ? SELECT?? – ?.)SQL?? ?-? ???????? ???: (?( ? column1,…,ColumnN )table_name?????? ??????? ?????????)? ??????: ))?( ? customer-name (σ branch_name="Aviv"(borrow?????? ???? ?? ??????? ???? ???? ??????? ????).? ?????? – ?( ? – Union????? ?????? ? – ?.)SQL?? ?-? ?????? ? – ? ,SQL??? ????? ??????? ????? ??? ?????? ???????? ????. ????? ??? ????? ?????? ??????. ?????:? ?))?)σ branch_name="Aviv" (deposit)) ? )σ branch_name="Aviv" (borrow?? ?#? ?*? ?????? ?????? – ?X - Cartesian Product?? ?-? ?1? ??a?? ?????? 2 ????? ?????? ??? ?? ?? ? – N??? ???? 1 ?????? ?? ? ? – N??? ????? ????.? ?1? ?*? ??b?? ??a?? ?#? ?????? – ?( ? – Intersection????? ?????? ? – ?)SQL?? ?-? ?1? ?= ?c?? ??b?? ?1 ?X?? ?????? ? – ? ,SQL??? ????? ??????? ????? ??? ?????? ???????? ????.? ?2? ??a?? ?2? ??c?? ?????? ??? ????? ?????? ????? ??? 2 ?????? ????? ???? ?????? ????.? ?2? ??b?? ?2? ??c?? ????? - ?– - Difference?? ?-? ??? ????? ?????? ????? ??? ?????? ???????? ????.? ????? ??? ???? ???? ??? ???? ??????,? ????? ????? ?????? ?????? ????? ?' ????? ??????? ????? ?'.? ?(???? ? – ? Inner join?? – ?)SQL?? ?????? ???? –?? - Natural Join?? ?-? ?????? ???? ????? ???? ?? ????? ??? ?????? ??? 2 ??????.? ?1?R2 ? R??