ã¯ããã« ã¿ã¤ãã«ã®ã¨ãããRDBã®ãã¼ã¿ã¢ããªã³ã°ã»ãã¼ãã«è¨è¨ãè¡ãéã«åèã«ãã¦ããèãæ¹ã¨é¢é£è³æãã¾ã¨ãã¾ããã P.S. ãªãã¨æ¬è¨äºå ã§ããã¤ãåèã¨ãã¦æãããã¦ããã£ã¦ããå¢ç°ããã»ãã¨ãã ãããã»å¥¥éããã»ãã¼ã ãããããã³ã¡ã³ãããã ããã¨ãã§ãã¾ããã æ¬å½ã«ãããã¨ããããã¾ãã åæ RDBãæ¡ç¨ããã®ã¯äºå®ãç¡é§ãªãæ£ããè¨é²ãããã æ£è¦åããã©ã³ã¶ã¯ã·ã§ã³ãå¶ç´ã¨ãã¼ã¿æ´åæ§ åºæ¬çã«ã¯å§ãã«çæ³ã¨ãã¦éåè«ã»ãªã¬ã¼ã·ã§ãã«ã¢ãã«ã«åºã¥ãã¦æ£è¦åãèã(è«çè¨è¨)ãããã©ã¼ãã³ã¹ãªã©ã®ç¾å®åé¡ã«å¯¾ãã¦æãåããã¤ãã¦ãã(ç©çè¨è¨) å¶ç´ãæ大éå©ç¨ãã cf: âP91ã âP.29,41 âP56ã â5ç« âP347ï½ æ å ±ã¨ãã¼ã¿ ãã¼ã¿ï¼åãªãäºå®ã®å¤âãããæ°¸ç¶åãã¦èãããã®ãRDB æ å ±ï¼ãã¼ã¿ããçã¿åºãããæå³ãç®çã®ãããã®âRDBã
N+1, solvedEdgeDB solves the problems that ORMs exist to workaround. A comparison that speaks for itself: SELECT movie.title, ( SELECT avg(rating) FROM reviews WHERE movie_id = movie.id ) AS avg_rating, (SELECT array_agg(q.v) FROM (SELECT person.name AS v FROM actors INNER JOIN persons AS person ON (actors.person_id = person.id) WHERE actors.movie_id = movie.id ) AS q WHERE q.v IS NOT NULL ) AS ac
ãã¼ã¿ãã¼ã¹ãé¸æãã使ç¨ãã管çããã«ã¯ããã®å é¨æ§é ãç解ãããã¨ãä¸å¯æ¬ ã§ããããããä»æ¥ã§ã¯ããããã®åæ£åãã¼ã¿ãã¼ã¹ããã¼ã«ãåå¨ããããããããããä½ãæä¾ãã¦ããã®ããã©ã®ããã«ç°ãªãã®ããç解ãããã¨ã¯å°é£ã§ãã æ¬æ¸ã¯ãã¼ã¿ãã¼ã¹ã¨ã¹ãã¬ã¼ã¸ã¨ã³ã¸ã³ã®å é¨ã§å©ç¨ããã¦ããæ¦å¿µã解説ãã¾ããã¹ãã¬ã¼ã¸ã¨ã³ã¸ã³ã§ã¯ãã¹ãã¬ã¼ã¸ã®åé¡ãBããªã¼ãã¼ã¹ã®ã¹ãã¬ã¼ã¸ã¨ã³ã¸ã³ã¨ã¤ãã¥ã¼ã¿ãã«ãªãã°æ§é åã¹ãã¬ã¼ã¸ã¨ã³ã¸ã³ã®éãã¨äºä¾ãç´¹ä»ãã¾ããã¹ãã¬ã¼ã¸ã®æ§æè¦ç´ ã«ã¤ãã¦ã¯ããã¼ã¸ãã£ãã·ã¥ããããã¡ãã¼ã«ããã°å è¡æ¸ãè¾¼ã¿ãªã©ã®è£å©çãªãã¼ã¿æ§é ã使ã£ã¦ãå¹ççãªã¹ãã¬ã¼ã¸ãæ§ç¯ããããã®ãã¼ã¿ãã¼ã¹ãã¡ã¤ã«ã®æ§æã説æãã¾ããåæ£åã·ã¹ãã ã§ã¯ããã¼ãã¨ããã»ã¹ãã©ã®ããã«æ¥ç¶ãããè¤éãªéä¿¡ãã¿ã¼ã³ãæ§ç¯ããã®ãã段éçã«å¦ã³ã¾ãã ãã¼ã¿ãã¼ã¹ããããã§å¤§ããªéããããã¹
ã©ã³ãã³ã°
ã©ã³ãã³ã°
ã©ã³ãã³ã°
ãªãªã¼ã¹ãé害æ å ±ãªã©ã®ãµã¼ãã¹ã®ãç¥ãã
ææ°ã®äººæ°ã¨ã³ããªã¼ã®é ä¿¡
å¦çãå®è¡ä¸ã§ã
j次ã®ããã¯ãã¼ã¯
kåã®ããã¯ãã¼ã¯
lãã¨ã§èªã
eã³ã¡ã³ãä¸è¦§ãéã
oãã¼ã¸ãéã
{{#tags}}- {{label}}
{{/tags}}