ORDER BYç‹™ã„ã®ã‚ーãŒä½•æ•…速ã„ã‹ - 時計を壊ã›ã©ã®æœ€é©åŒ–ãŒåŠ¹ãんや…ã¨ã‚°ã‚°ã£ãŸã€‚ 以å‰ã‚‚調ã¹ãŸæ°—ãŒã—ãŸãŒæ€ã„ã ã›ãšã€ã²ãŸã™ã‚‰ã‚°ã‚°ã‚‹ç¾½ç›®ã«ãªã£ãŸã®ã§ã€ åçœã—ã¦ãƒ–ãƒã‚°ã«æ®‹ã™ã€‚ãµã¤ãƒ¼ã«mysqlã®documentã«æ›¸ã„ã¦ã‚ã£ãŸã€‚ http://dev.mysql.com/doc/refman/5.7/en/limit-optimization.html If you use LIMIT row_count with ORDER BY, MySQL ends the sorting as soon as it has found the first row_count rows of the sorted result, rather than sorting the entire result. If ordering is done by using an index, this is very fast. ãƒãƒ¼ã‚¸ãƒ§ãƒ³å¤ã„ã‘ã©æ—¥æœ¬èªžã®ã»
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