[B! sql][mysql] peketaminã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

peketamin id:peketamin

sqlã¨mysqlã«é–¢ã™ã‚‹peketaminã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (11)

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

${{author_name}}$
{{author_name}}{{created}}
{{ #comment }}{{ comment }}{{ /comment }}
- {{ label }}

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

YappoLogs: ãªãœ SQL_CALC_FOUND_ROWS ã‚„ LIMIT OFFSET ã®ãƒšãƒ¼ã‚¸ãƒ³ã‚°ãŒè‰¯ãç„¡ã„ã®ã‹
ãªãœ SQL_CALC_FOUND_ROWS ã‚„ LIMIT OFFSET ã®ãƒšãƒ¼ã‚¸ãƒ³ã‚°ãŒè‰¯ãç„¡ã„ã®ã‹ ã“ã“æœ€è¿‘ã®å¤§è¦æ¨¡ã‚µãƒ¼ãƒ“ã‚¹é–¢é€£ã—ãŸãƒ‡ãƒ¼ã‚¿ãƒšãƒ¼ã‚¸ãƒ³ã‚°è€ƒã§ã™ã€‚ mysql 5.5.34 ã§è©¦ã—ã¦è¨˜äº‹æ›¸ã„ã¦ã¾ã™ã€‚ bigdata ãƒ†ãƒ¼ãƒ–ãƒ«ã¯ id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY (id) ãªã‚«ãƒ©ãƒ ãŒã‚ã‚‹å‰æã§ã™ã€‚ã‚‚ã¡ã‚ã‚“ InnoDB ã§ã™ã€‚ 2014å¹´ãªã‚“ã ã‹ã‚‰COUNT(*)ã¨ã‹SQL_CALC_FOUND_ROWSã¨ã‹LIMIT OFFSETã®ãƒšãƒ¼ã‚¸ãƒ³ã‚°ã¯ã‚„ã‚ã‚ˆã†ãœ - Togetterã¾ã¨ã‚ãŒç™ºç«¯ã«ã¿ãˆã‚‹ã‘ã©ã€ã‚ã‚Šã¨æ˜”ã‹ã‚‰è©±ã•ã‚Œã¦ã‚‹äº‹ãªã‚“ã ã‘ã©ã€ã€Œnippondanji SQL_CALC_FOUND_ROWSã€ã§ã‚°ã‚°ã£ã¦ã‚‚æœ‰ç”¨ãªæƒ…å ±ãªã„ã—æ–‡æ›¸åŒ–ã•ã‚Œã¦ãªã„ã‹ã‚‰ã—ã¨ãã€‚ ãƒšãƒ¼ã‚¸ãƒ³ã‚°å‡¦ç†ã§ä½¿ã‚ã‚ŒãŒã¡ãªæ©Ÿèƒ½ã§ã™ã€‚ S
peketamin 2015/12/30
ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°

MySQL

sql
ãƒªãƒ³ã‚¯
ã€MySQLã€‘SQLç™ºè¡Œæ™‚ã«æ—¥æ™‚è¨ˆç®—ï¼ˆåŠ ç®—ãƒ»æ¸›ç®—ï¼‰ã™ã‚‹æ–¹æ³• | WEBãƒžã‚¹ã‚¿ãƒ¼ã®çŸ¥æµãƒ–ãƒã‚°
PHP+MySQLã‚’åˆ©ç”¨ã—ã¦ã„ã¦ã€DATETIMEåž‹ã®ã‚«ãƒ©ãƒ ã«å¯¾ã—ã¦ã€ç›´æŽ¥ã€åŠ ç®—ãƒ»æ¸›ç®—ã‚’ã—ãŸSQLã®æ¡ä»¶ã‚’æŒ‡å®šã—ãŸã„å ´åˆã®æ–¹æ³•ã«ã¤ã„ã¦è¦šæ›¸ã—ã¦ãŠãã¾ã™ã€‚ ã‚‚ã¡ã‚ã‚“ã€PHPã§æ—¥æ™‚è¨ˆç®—ã‚’ã—ã¦ã€å¤‰æ•°ã«ä»£å…¥ã—ã¦ã‹ã‚‰SQLã«çµ„ã¿è¾¼ã‚€ãªã©ã—ã¦ã‚‚æ—¥æ™‚ã®åŠ ç®—ãƒ»æ¸›ç®—ã®æ¡ä»¶ä»˜ã‘ã¯ã§ãã‚‹ã®ã§ã™ãŒã€SQLã®ç™ºè¡Œæ™‚ç‚¹ã§åŠ ç®—ãƒ»æ¸›ç®—ã—ãŸæ–¹ãŒæ¥½ã«æ“ä½œã§ãã¾ã™ã€‚ MySQLã®å…¬å¼ãƒžãƒ‹ãƒ¥ã‚¢ãƒ«ã«ã‚‚è¨˜è¿°ãŒã‚ã‚‹ã®ã§ã™ãŒã€MySQLã®ãƒžãƒ‹ãƒ¥ã‚¢ãƒ«ã¯èªã¿ã¥ã‚‰ã„ã¨æ€ã†ã®ã§è¦ç‚¹ã‚’ã¾ã¨ã‚ã¦ã¿ã¾ã—ãŸã€‚ ï¼ˆå‚è€ƒï¼‰å…¬å¼ãƒžãƒ‹ãƒ¥ã‚¢ãƒ« http://dev.mysql.com/doc/refman/5.1/ja/date-and-time-functions.html è©²å½“ã™ã‚‹ã®ã¯DATE_ADD DATE_SUBã®ç®‡æ‰€ã§ã™ã€‚ åˆ†ã‹ã‚Šã¥ã‚‰ã„ã®ã§ã€å…·ä½“çš„ãªSQLã‚’çµ„ã‚“ã§ã¿ã¾ã™ã€‚ "SELECT count(id) as cnt FROMÂ table WHE
peketamin 2015/04/13
MySQL

sql
ãƒªãƒ³ã‚¯
SQLã®è¦³ç‚¹ã‹ã‚‰ã€ŒOracle Databaseã€ã€ŒPostgreSQLã€ ã€ŒMySQLã€ã®ç‰¹å¾´ã‚’æ•´ç†ã—ã‚ˆã†ï¼
EnterpriseZineï¼ˆã‚¨ãƒ³ã‚¿ãƒ¼ãƒ—ãƒ©ã‚¤ã‚ºã‚¸ãƒ³ï¼‰ç·¨é›†éƒ¨ã§ã¯ã€æƒ…å ±ã‚·ã‚¹ãƒ†ãƒ æ‹…å½“ã€ã‚»ã‚ãƒ¥ãƒªãƒ†ã‚£æ‹…å½“ã®æ–¹ã€…å‘ã‘ã«ã€EnterpriseZine Dayã€Security Online Dayã€DataTechã¨ã„ã†ã€3ã¤ã®ã‚¤ãƒ™ãƒ³ãƒˆã‚’é–‹å‚¬ã—ã¦ãŠã‚Šã¾ã™ã€‚ãã‚Œãžã‚Œç·¨é›†éƒ¨ç‹¬è‡ªã®åˆ‡ã‚Šå£ã§ã€æ¥ç•Œãƒˆãƒ¬ãƒ³ãƒ‰ã‚„æœ€æ–°äº‹ä¾‹ã‚’ç¶²ç¾…ã€‚æœ€æ–°ã®å‹•å‘ã‚’çŸ¥ã‚‹ã“ã¨ãŒã§ãã‚‹å ´ã¨ã—ã¦ã€å¥½è©•ã‚’å¾—ã¦ã„ã¾ã™ã€‚
peketamin 2014/10/02
db

MySQL

PostgreSQL

Oracle

SQL
ãƒªãƒ³ã‚¯
online-schema-changeã‚’éŽä¿¡ã—ã¦ã„ãŸã‚‰ç—›ã„ç›®ã‚’ã¿ãŸè©± - FAT47ã®åº•è¾ºã‚¤ãƒ³ãƒ•ãƒ©è°äº‹éŒ²
å…ˆæ—¥è¨˜äº‹ã«æ›¸ã„ãŸã‚ˆã†ã«ã€ç„¡åœæ¢ã®ALTERæ–‡å®Ÿè¡Œã§ã¯ Percona-Toolkitã®Online-schema-changeã‚’åˆ©ç”¨ã—ã¦ã„ã¾ã™ã€‚ ç„¡åœæ¢ã§ALTERã§ãã‚‹Percona-Toolkitã®online-schema-change ã‚ªãƒ³ãƒ©ã‚¤ãƒ³ã§ã®ã‚«ãƒ©ãƒ è¿½åŠ ç§ãŒæ‹…å½“ã—ã¦ã„ã‚‹ã‚µãƒ¼ãƒ“ã‚¹ã§ã¯ã€ALTERæ–‡å®Ÿè¡Œæ™‚ã«ãƒ¬ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®é…å»¶ã‚’å‡ºæ¥ã‚‹ã ã‘ç™ºç”Ÿã•ã›ãŸããªã„ã®ã§ã€ ä»¥ä¸‹ã®æ§˜ãªæ‰‹é †ã§Online-schema-changeã‚’å®Ÿè¡Œã—ã¦ã„ã¾ã™ã€‚ (1) ã‚¹ãƒ¬ãƒ¼ãƒ–å…¨å°ã§Online-schema-changeã®å®Ÿè¡Œ (2) ãƒžã‚¹ã‚¿ãƒ¼ã§Online-schema-changeã®å®Ÿè¡Œï¼ˆ--set-vars="sql_log_bin=0"ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³æŒ‡å®šï¼‰ "sql_log_bin=0"ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’ã¤ã‘ã¦å®Ÿè¡Œã™ã‚‹ã¨ã€binlogã‚’å‡ºã•ãšã«å®Ÿè¡Œã§ãã‚‹ã®ã§ã€ ãƒžã‚¹ã‚¿ãƒ¼ã§å®Ÿè¡Œã—ã¦ã‚‚ãã®ã‚¯ã‚¨ãƒªã¯ã‚¹ãƒ¬ãƒ¼
peketamin 2014/04/21
MySQL

SQL

ãƒ¬ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³
ãƒªãƒ³ã‚¯
ORDER BYç‹™ã„ã®ã‚ãƒ¼ãŒä½•æ•…é€Ÿã„ã‹ - æ™‚è¨ˆã‚’å£Šã›
ã©ã®æœ€é©åŒ–ãŒåŠ¹ãã‚“ã‚„â€¦ã¨ã‚°ã‚°ã£ãŸã€‚ ä»¥å‰ã‚‚èª¿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»
peketamin 2014/03/25
mysql

ORDER BY

æœ€é©åŒ–

SQL

DB
ãƒªãƒ³ã‚¯
ã‚¿ã‚°æ©Ÿèƒ½ã‚’å®Ÿç¾ã™ã‚‹ãŸã‚ã®ä¾¿åˆ©ãªãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹è¨è¨ˆã‚’ï¼“ã¤ç´¹ä»‹ | colori
ANDæ¤œç´¢ ã€ŒCSS+HTML+JavaScriptã€ã§æ¤œç´¢ã™ã‚‹å ´åˆã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ã—ã¾ã™ã€‚ SELECT * FROM `delicious` WHERE tags LIKE "%CSS%" AND tags LIKE "%HTML%" AND tags LIKE "%JavaScript%" ORæ¤œç´¢ ã€ŒCSS|HTML|JavaScriptã€ã§æ¤œç´¢ã™ã‚‹å ´åˆã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ã—ã¾ã™ã€‚ SELECT * FROM `delicious` WHERE tags LIKE "%CSS%" OR tags LIKE "%HTML%" OR tags LIKE "%JavaScript%" å¼•ãç®—æ¤œç´¢ ã€ŒCSS+HTML-JavaScriptã€ã§æ¤œç´¢ã™ã‚‹å ´åˆã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ã—ã¾ã™ã€‚ SELECT * FROM `delicious` WHERE tags LIKE "%CSS%" AND tags LI
peketamin 2012/12/13
DataBase

è¨è¨ˆ

ã‚¿ã‚°

MySQL

SQL
ãƒªãƒ³ã‚¯
ä»Šé¢¨ã®UIã€‚Ajaxã‚’ä½¿ã£ãŸPHPãƒ™ãƒ¼ã‚¹ã®MySQLç®¡ç†ã‚·ã‚¹ãƒ†ãƒ Â·MyWebSql MOONGIFT
MyWebSqlã¯Ajaxã‚’å¤šç”¨ã—ãŸä»Šé¢¨ã®UIã‚’ä½¿ã£ãŸMySQLç®¡ç†ãƒ„ãƒ¼ãƒ«ã€‚ MyWebSqlã¯PHPè£½ã®ã‚ªãƒ¼ãƒ—ãƒ³ã‚½ãƒ¼ã‚¹ãƒ»ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã€‚PHPã¨è¨€ãˆã°MySQLã€ãã®äºŒã¤ã®çµ„ã¿åˆã‚ã›ã‹ã‚‰ç”Ÿã¿å‡ºã•ã‚ŒãŸphpMyAdminã€‚LAMPã‚¹ã‚¿ãƒƒã‚¯ãªã‚“ã¦è¨€è‘‰ãŒç”Ÿã¿å‡ºã•ã‚ŒãŸã®ã«phpMyAdminã®å„ªç§€ã•ãŒã‚ã£ãŸã“ã¨ã¯å¦å®šã§ããªã„ã€‚ãã‚Œãã‚‰ã„èª°ã—ã‚‚ãŒä½¿ã£ã¦ã„ã‚‹ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã ã€‚ ãƒ‡ãƒ¼ã‚¿ä¸€è¦§ ã ãŒé•·ã„å¹´æœˆã®ã†ã¡ã«UIã¯å¤ã„ã‚‚ã®ã«ãªã‚Šã€ã¡ã‚‡ã£ã¨æ™‚ä»£ãŒå¤‰ã‚ã£ã¦ãã¦ã„ã‚‹ã‹ã¨ã„ã†æ°—ãŒã—ãªãã‚‚ãªã„ã€‚ãã“ã§ä»Šã®Webã«åˆã‚ã›ãŸMySQLç®¡ç†ãƒ„ãƒ¼ãƒ«ã‚’ç´¹ä»‹ã—ã‚ˆã†ã€‚ãã‚ŒãŒMyWebSqlã ã€‚ MyWebSqlã¯Webã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³é¢¨ã®ã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ã«åŠ ãˆã¦ã€UIã®ãƒ‡ã‚¶ã‚¤ãƒ³ã‚‚ãƒãƒƒãƒ—ã§æ˜Žã‚‹ã„é…è‰²ã«ãªã£ã¦ã„ã¦ä½¿ã„å‹æ‰‹ãŒè‰¯ã„ã€‚å·¦å´ã«ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã®ä¸€è¦§ã€å³å´ã§ãƒ‡ãƒ¼ã‚¿ã®ç·¨é›†ã‚’è¡Œã†ã‚¹ã‚¿ã‚¤ãƒ«ã¯phpMyAdminã¨åŒã˜ã ã€‚ã•ã‚‰ã«ä¸‹ã«ã¯SQ
peketamin 2011/08/02
mysql

SQL

Ajax

php

IT

ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹

web

UI

phpMyAdmin

ajax
ãƒªãƒ³ã‚¯
ã¯ã˜ã‚ã¦ã® MySQL ã§100ä¸‡ä»¶ã®ãƒ‡ãƒ¼ã‚¿ã‚’ç®¡ç†ã™ã‚‹æ™‚ã«è¡Œã£ãŸãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¾ã¨ã‚
MySQL ã®å‹‰å¼·ã‚’ã›ãšã«ãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ç‰ã§ SQL ã‚’æ›¸ã‹ãšã« Web ã‚µã‚¤ãƒˆã‚’æ§‹ç¯‰ã—ã¦ã„ã¾ã—ãŸã€‚ãƒ‡ãƒ¼ã‚¿æ•°ã‚‚2ä¸‡ä»¶ç¨‹åº¦ã§ã—ãŸã®ã§ã€ãã“ã¾ã§å›°ã‚‹ã“ã¨ã¯ã‚ã‚Šã¾ã›ã‚“ã§ã—ãŸãŒã€ä»Šå›ž100ä¸‡å¼±ã®å•†å“ãƒ‡ãƒ¼ã‚¿ã‚’æ‰±ã†æ©Ÿä¼šãŒã§ããŸã®ã§ã€MySQL ã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã‚„ç™ºè¡Œã™ã‚‹ SQL ã«ã¤ã„ã¦è¦‹ç›´ã™æ©Ÿä¼šãŒã‚ã‚Šã¾ã—ãŸã€‚ ã“ã®è¨˜äº‹ã§ã¯ MySQL ã‚’é«˜é€ŸåŒ–ã™ã‚‹ã®ã«è¡Œã£ãŸå¯¾ç–ãªã©å‹‰å¼·ã—ãŸã‚‚ã®ã‚’è‡ªåˆ†ç”¨ã«ãƒ¡ãƒ¢ã—ã¦ãŠãã¾ã—ãŸã€‚ æ¡ä»¶å¼ã§æ¯”è¼ƒã™ã‚‹ã‚«ãƒ©ãƒ ã«ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚’ä½¿ç”¨ã—ã¦é«˜é€ŸåŒ– å•†å“ã‚³ãƒ¼ãƒ‰ã§å˜åœ¨ã—ãªã„å•†å“ã‚’è¦‹ã¤ã‘ã¦ã€å•†å“ã‚’DBã«ç™»éŒ²ã™ã‚‹ã¨ã„ã†å‡¦ç†ã‚’è¡Œã£ã¦ã„ã‚‹å ´åˆã€4ä¸‡ä»¶è¶…ãˆãŸã“ã‚ã‹ã‚‰å‡¦ç†ã«2ç§’ä»¥ä¸Šã‹ã‹ã‚‹ã‚ˆã†ã«ãªã£ã¦ãã¾ã™ã€‚12ä¸‡ä»¶è¶…ãˆãŸé ƒã«ã¯10ç§’ç¨‹åº¦ã‹ã‹ã‚‹ã‚ˆã†ã«ãªã£ã¦ã—ã¾ã„ã¾ã—ãŸãŒã€å•†å“ã‚³ãƒ¼ãƒ‰ã®ãƒ•ã‚£ãƒ¼ãƒ«ãƒ‰ã«å¯¾ã—ã¦ã‚«ãƒ©ãƒ ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚’è²¼ã‚‹ã“ã¨ã§0.2ç§’ã«çŸç¸®ã™ã‚‹ã“ã¨ãŒã§ãã¾ã—ãŸã€‚ MySQL ã®ãƒªãƒ•ã‚¡ãƒ¬ãƒ³ã‚¹ã«ã‚‚ä»¥ä¸‹ã®ã‚ˆ
peketamin 2011/07/25
ãã†ã‹ã€åŸºæœ¬ã¯ã€Œæ¡ä»¶å¼ã§æ¯”è¼ƒã™ã‚‹ã‚«ãƒ©ãƒ ã«ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚’ã¯ã‚‹ã€ã“ã¨ã‹

mysql

SQL

index

MySQL

ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°

ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹

é«˜é€ŸåŒ–

sql

webåˆ¶ä½œ

db
ãƒªãƒ³ã‚¯
ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ é–‹ç™ºè€…ãªã‚‰çŸ¥ã£ã¦ãŠããŸã„ MySQL INDEX + EXPLAINå…¥é–€ï½œæŠ€è¡“ãƒ–ãƒã‚°ï½œåŒ—æµ·é“æœå¹Œå¸‚ãƒ»å®®åŸŽçœŒä»™å°å¸‚ã®VRãƒ»ã‚²ãƒ¼ãƒ ãƒ»ã‚·ã‚¹ãƒ†ãƒ é–‹ç™º ã‚¤ãƒ³ãƒ•ã‚£ãƒ‹ãƒƒãƒˆãƒ«ãƒ¼ãƒ—
ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ é–‹ç™ºè€…ãªã‚‰çŸ¥ã£ã¦ãŠããŸã„ MySQL INDEX + EXPLAINå…¥é–€ åºƒãæµ…ãã‚’æ‹…å½“ã—ã¦ã¾ã™ã€ota ã§ã™ã€‚ æŠ€è¡“ãƒ–ãƒã‚°ç¬¬ä¸€å›žã‹ã‚‰æ—©é€Ÿæµç”¨ã‚¹ãƒ©ã‚¤ãƒ‰ã§ç”³ã—è¨³ã‚ã‚Šã¾ã›ã‚“ãŒã€ç¤¾å†…å‹‰å¼·ä¼šè³‡æ–™ã¨ã—ã¦ä½œæˆã—ãŸã€ŒMySQL INDEX + EXPLAINå…¥é–€ã€ã§ã™ã€‚ å½“ç¤¾ã§ã‚‚ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ ã®é–‹ç™ºã‚’è¡Œã£ã¦ã„ã¾ã™ãŒã€ã“ã®ã‚ˆã†ãªå¤§é‡ã®ãƒ‡ãƒ¼ã‚¿ã‚’ä½¿ç”¨ã™ã‚‹ãƒ»ã‚¯ã‚¨ãƒªã®é€Ÿåº¦ãŒæ±‚ã‚ã‚‰ã‚Œã‚‹å ´åˆã«ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã¯å¤§å¤‰é‡è¦ã§ã™ã€‚ ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®æœ‰åŠ¹ãªåˆ©ç”¨ã«ã¯DBè¨è¨ˆè€…ã ã‘ã§ã¯ãªããƒ—ãƒã‚°ãƒ©ãƒžã«ã‚‚ã‚ã‚‹ç¨‹åº¦ã®çŸ¥è˜ãŒæœ€ä½Žé™å¿…è¦ã¨ãªã‚Šã¾ã™ãŒã€ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã«ã¤ã„ã¦ã®åˆå¿ƒè€…å‘ã‘è³‡æ–™ãŒã‚ã¾ã‚Šãªã„ã‚ˆã†ã§ã™ã€‚ ã“ã®ã‚¹ãƒ©ã‚¤ãƒ‰ã§ã¯ãƒ—ãƒã‚°ãƒ©ãƒžã«çŸ¥ã£ã¦ãŠã„ã¦æ¬²ã—ã„ä»¥ä¸‹ã®åŸºæœ¬çš„ãªç‚¹ã‚’ã¾ã¨ã‚ã¾ã—ãŸã€‚ INDEXã‚’ä½¿ç”¨ã™ã‚‹æ™‚ã«æ°—ã‚’ã¤ã‘ã‚‹ã“ã¨ WHEREå¥ !=ã€<>ã¯ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ãŒä½¿ç”¨ã§ããªã„ WHEREå¥ã®å…¨ã¦ã®ANDã«ã‹ã‹ã£ã¦ã„ãªã„ã‚¤ãƒ³
peketamin 2011/04/14
index

ci

mysql

DB

SQL

performance

ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°

ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ

é–‹ç™º
ãƒªãƒ³ã‚¯
http://blog.tofu-kun.org/070601193853.php
peketamin 2010/10/07
å˜ç´”ãªç½®æ›ãªã‚‰ã§ãã‚‹ã¨ã€‚ãƒ©ã‚¯ãƒãƒ³ãƒ©ã‚¯ãƒãƒ³ãƒ»ãƒ»ãƒ»ã€‚

mysql

SQL

Tips
ãƒªãƒ³ã‚¯
MSN Japan - ãƒ‹ãƒ¥ãƒ¼ã‚¹, å¤©æ°—, ãƒ¡ãƒ¼ãƒ« (Outlook, Hotmail), Bingæ¤œç´¢, Skype
peketamin 2010/09/29
SQL

MySQL

JOIN
ãƒªãƒ³ã‚¯
1