{"id":6983,"date":"2026-04-24T11:27:13","date_gmt":"2026-04-24T02:27:13","guid":{"rendered":"https:\/\/taitan916.info\/blog\/?p=6983"},"modified":"2025-06-24T11:41:08","modified_gmt":"2025-06-24T02:41:08","slug":"post-6983","status":"publish","type":"post","link":"https:\/\/taitan916.info\/blog\/archives\/6983","title":{"rendered":"MySQL\u3067\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30e0\u306e\u4e2d\u592e\u5024\u3092\u62bd\u51fa\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"

MySQL\u3067\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30e0\u306e\u4e2d\u592e\u5024\u3092\u62bd\u51fa\u3057\u305f\u3044\u3068\u3044\u3046\u30b1\u30fc\u30b9\u304c\u3042\u3063\u305f\u3002MariaDB\u306e10.3.3\u4ee5\u4e0a\u3060\u3068\u4e2d\u592e\u5024\u3092\u6c42\u3081\u308bMEDIAN()\u3068\u3044\u3046\u95a2\u6570<\/a>\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u3089\u3057\u3044\u304c\u3001\u5f53\u65b9\u306e\u74b0\u5883\u306fMySQL8.0.32\u306e\u305f\u3081\u5b9f\u88c5\u3055\u308c\u3066\u304a\u3089\u305a\u3001SQL\u6587\u3067\u4f55\u3068\u304b\u3057\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u3063\u307d\u3044\u3002\u4ee5\u4e0b\u306b\u5bfe\u5fdc\u65b9\u6cd5\u3092\u30e1\u30e2\u3002<\/p>\n

 <\/p>\n

\u30c6\u30fc\u30d6\u30eb\u69cb\u9020<\/span><\/h2>\n
mysql> SHOW COLUMNS FROM `test_table`;\r\n+-------+------+------+-----+---------+----------------+\r\n| Field | Type | Null | Key | Default | Extra          |\r\n+-------+------+------+-----+---------+----------------+\r\n| id    | int  | NO   | PRI | NULL    | auto_increment |\r\n| score | int  | NO   |     | NULL    |                |\r\n+-------+------+------+-----+---------+----------------+<\/pre>\n
 <\/p>\n
\u30c7\u30fc\u30bf\u5185\u5bb9<\/span><\/h2>\n
mysql> SELECT * FROM `test_table` ORDER BY `score` DESC;\r\n+----+-------+\r\n| id | score |\r\n+----+-------+\r\n|  1 |   100 |\r\n|  4 |    80 |\r\n|  5 |    70 |\r\n| 10 |    70 |\r\n|  3 |    60 |\r\n|  7 |    55 |\r\n|  6 |    50 |\r\n|  2 |    40 |\r\n|  8 |    20 |\r\n|  9 |    20 |\r\n+----+-------+<\/pre>\n
 <\/p>\n
\u5bfe\u5fdc\u65b9\u6cd5<\/h2>\n
SQL\u6587<\/h3>\n
SET @row_index := -1;\r\nSELECT AVG(subq.score) AS median_value \r\nFROM \r\n    (\r\n        SELECT @row_index:=@row_index + 1 AS row_index, score\r\n        FROM test_table\r\n        ORDER BY score\r\n    ) AS subq\r\nWHERE subq.row_index IN (FLOOR(@row_index \/ 2), CEIL(@row_index \/ 2));<\/pre>\n
\u51fa\u529b\u7d50\u679c<\/h3>\n
\u4e0a\u8a18SQL\u6587\u3092\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u304c\u51fa\u529b\u3055\u308c\u308b\u7b48\u3002\u5168\u30c7\u30fc\u30bf\u306e\u884c\u6570\u304c\u5076\u6570\u306b\u306a\u308b\u305f\u3081\u3001id3\u306e60\u3068id7\u306e50\u306e\u5e73\u5747\u5024\u304c\u51fa\u529b\u3055\u308c\u308b\u3002<\/p>\n
+--------------+\r\n| median_value |\r\n+--------------+\r\n|      57.5000 |\r\n+--------------+<\/pre>\n
\u5168\u30c7\u30fc\u30bf\u306e\u884c\u6570\u304c\u5947\u6570\u306e\u5834\u5408<\/h3>\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5168\u30c7\u30fc\u30bf\u306e\u884c\u6570\u304c\u5947\u6570\u884c\u306e\u5834\u5408\u3001<\/p>\n
mysql> SELECT * FROM `test_table` ORDER BY `score` DESC;\r\n+----+-------+\r\n| id | score |\r\n+----+-------+\r\n|  1 |   100 |\r\n|  4 |    80 |\r\n|  5 |    70 |\r\n| 10 |    70 |\r\n|  3 |    60 |\r\n|  7 |    55 |\r\n|  6 |    50 |\r\n|  2 |    40 |\r\n| 11 |    30 |\r\n|  8 |    20 |\r\n|  9 |    20 |\r\n+----+-------+<\/pre>\n
\u524d\u8ff0\u306eSQL\u6587\u3092\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u304c\u51fa\u529b\u3055\u308c\u308b\u7b48\u3002<\/p>\n
+--------------+\r\n| median_value |\r\n+--------------+\r\n|      55.0000 |\r\n+--------------+<\/pre>\n
\u3053\u3061\u3089\u306fid7\u306e55\u304c\u305d\u306e\u307e\u307e\u51fa\u529b\u3055\u308c\u305f\u3002<\/p>\n
 <\/p>\n
\u53c2\u8003\u30b5\u30a4\u30c8<\/h2>\n
https:\/\/sebhastian.com\/mysql-median\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
MySQL\u3067\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30e0\u306e\u4e2d\u592e\u5024\u3092\u62bd\u51fa\u3057\u305f\u3044\u3068\u3044\u3046\u30b1\u30fc\u30b9\u304c\u3042\u3063\u305f\u3002MariaD ... <\/p>\n","protected":false},"author":1,"featured_media":1072,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5,66],"tags":[],"class_list":["post-6983","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql","category-database"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6983","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/comments?post=6983"}],"version-history":[{"count":1,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6983\/revisions"}],"predecessor-version":[{"id":6984,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6983\/revisions\/6984"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media\/1072"}],"wp:attachment":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media?parent=6983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/categories?post=6983"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/tags?post=6983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}