PRIMARY KEY (\u5217\u540d)<\/b><\/li>\n<\/ul>\n<\/div>
\n\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n
\u300c\u5f93\u696d\u54e1\u756a\u53f7\u3001\u90e8\u7f72\u756a\u53f7\u3001\u6027\u3001\u540d\u300d\u3092\u6301\u3064\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3068\u540c\u6642\u306b\u300c\u5f93\u696d\u54e1\u756a\u53f7\u300d\u306bPRIMARY KEY\u3092\u8a2d\u5b9a\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
CREATE TABLE sample1_employees (\r\n no int NOT NULL, -- \u5f93\u696d\u54e1\u756a\u53f7\r\n department_no int, -- \u90e8\u7f72\u756a\u53f7\r\n last_name varchar(255), -- \u540d\r\n first_name varchar(255), -- \u59d3\r\n PRIMARY KEY (no)\r\n);<\/pre>\nPRIMARY KEY\u304c\u8a2d\u5b9a\u3055\u308c\u305f\u304b\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002Sequel Pro\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u6b21\u306e\u3088\u3046\u306b\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
![\"sql_primary_key_2png](\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/sql_primary_key_2png-1.png\")
<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u300c\u5f93\u696d\u54e1\u756a\u53f7(no)\u300d\u306bPRIMARY KEY\u304c\u5b9a\u7fa9\u3055\u308c\u305f\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u3082\u3057\u3082\u3001MySQL\u306e\u30b3\u30de\u30f3\u30c9\u3067\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f\u3001DESC\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u3063\u3066Key\u5217\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n
“PRI”\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u305d\u306e\u5217\u306fPRIMARY KEY\u3067\u3059\u3002<\/p>\n
mysql> desc sample1_employees;\r\n+---------------+--------------+------+-----+---------+-------+\r\n| Field | Type | Null | Key | Default | Extra |\r\n+---------------+--------------+------+-----+---------+-------+\r\n| no | int(11) | NO | PRI | NULL | |\r\n| department_no | int(11) | YES | | NULL | |\r\n| last_name | varchar(255) | YES | | NULL | |\r\n| first_name | varchar(255) | YES | | NULL | |\r\n+---------------+--------------+------+-----+---------+-------+\r\n4 rows in set (0.00 sec)\r\n<\/pre>\n\u6b21\u9805\u3067\u306f\u3001PRIMARY KEY\u3092\u5f8c\u304b\u3089\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n
PRIMARY KEY(\u4e3b\u30ad\u30fc)\u3092\u5f8c\u304b\u3089\u8ffd\u52a0\u3057\u3066\u307f\u3088\u3046<\/h2>\n
\u4f5c\u6210\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u306b\u3001PRIMARY KEY\u3092\u5f8c\u304b\u3089\u8ffd\u52a0\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3067\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002
\n
<\/p>\n
\n- ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d ADD PRIMARY KEY(\u5217\u540d);<\/b><\/li>\n<\/ul>\n
<\/div>
\n\u5f93\u696d\u54e1\u30c6\u30fc\u30d6\u30eb\u306e\u300c\u5f93\u696d\u54e1\u756a\u53f7(no) \u300d\u306bPRIMARY KEY\u3092\u8a2d\u5b9a\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u306f\u3058\u3081\u306b\u3001\u5f93\u696d\u54e1\u30c6\u30fc\u30d6\u30eb\u3092PRIMARY KEY\u306e\u8a2d\u5b9a\u306a\u3057\u3067\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
CREATE TABLE sample2_employees (\r\n no int NOT NULL, -- \u5f93\u696d\u54e1\u756a\u53f7\r\n department_no int, -- \u90e8\u7f72\u756a\u53f7\r\n last_name varchar(255), -- \u540d\r\n first_name varchar(255) -- \u59d3\r\n);<\/pre>\n\u30c6\u30fc\u30d6\u30eb\u5b9a\u7fa9\u306e\u72b6\u614b\uff1a<\/p>\n
mysql> desc sample2_employees;\r\n+---------------+--------------+------+-----+---------+-------+\r\n| Field | Type | Null | Key | Default | Extra |\r\n+---------------+--------------+------+-----+---------+-------+\r\n| no | int(11) | NO | | NULL | |\r\n| department_no | int(11) | YES | | NULL | |\r\n| last_name | varchar(255) | YES | | NULL | |\r\n| first_name | varchar(255) | YES | | NULL | |\r\n+---------------+--------------+------+-----+---------+-------+\r\n4 rows in set (0.00 sec)<\/pre>\n\u300cKey\u5217\u300d\u306b\u201dPRI\u201d\u304c\u306a\u3044\u305f\u3081\u3001PRIMARY KEY\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3064\u3065\u3044\u3066\u3001ALTER TABLE\u6587\u3067\u300c\u5f93\u696d\u54e1\u756a\u53f7(no)\u300d\u306bPRIMARY KEY\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
ALTER TABLE sample2_employees ADD PRIMARY KEY(no);<\/pre>\n\u30c6\u30fc\u30d6\u30eb\u306e\u5b9a\u7fa9\uff1a<\/p>\n
mysql> desc sample2_employees;\r\n+---------------+--------------+------+-----+---------+-------+\r\n| Field | Type | Null | Key | Default | Extra |\r\n+---------------+--------------+------+-----+---------+-------+\r\n| no | int(11) | NO | PRI | NULL | |\r\n| department_no | int(11) | YES | | NULL | |\r\n| last_name | varchar(255) | YES | | NULL | |\r\n| first_name | varchar(255) | YES | | NULL | |\r\n+---------------+--------------+------+-----+---------+-------+\r\n4 rows in set (0.00 sec)<\/pre>\n\u3053\u306e\u3088\u3046\u306b\u3001ALTER TABLE \u6587\u3067PRIMARY KEY\u3092\u5f8c\u304b\u3089\u8ffd\u52a0\u3067\u304d\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u6b21\u306f\u3001PRIMARY KEY\u3092\u524a\u9664\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n
PRIMARY KEY(\u4e3b\u30ad\u30fc)\u3092\u524a\u9664\u3057\u3066\u307f\u3088\u3046<\/h2>\n
PRIMARY KEY\u3092\u524a\u9664\u3059\u308b\u306b\u306f\u3001
\n
<\/p>\n
\n- ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d DROP PRIMARY KEY;<\/b><\/li>\n<\/ul>\n
<\/div>
\n\u3067\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u5b9f\u884c\u3057\u3066\u898b\u307e\u3057\u3087\u3046\u3002<\/p>\n
ALTER TABLE sample2_employees DROP PRIMARY KEY;<\/pre>\n\u30c6\u30fc\u30d6\u30eb\u5b9a\u7fa9\u306e\u72b6\u614b\uff1a<\/p>\n
mysql> desc sample2_employees;\r\n+---------------+--------------+------+-----+---------+-------+\r\n| Field | Type | Null | Key | Default | Extra |\r\n+---------------+--------------+------+-----+---------+-------+\r\n| no | int(11) | NO | | NULL | |\r\n| department_no | int(11) | YES | | NULL | |\r\n| last_name | varchar(255) | YES | | NULL | |\r\n| first_name | varchar(255) | YES | | NULL | |\r\n+---------------+--------------+------+-----+---------+-------+\r\n4 rows in set (0.00 sec)<\/pre>\n\u3053\u306e\u3088\u3046\u306b\u3001\u300cno\u5217\u300d\u306ePRIMARY KEY\u3092\u524a\u9664\u3057\u305f\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u8907\u6570\u306e\u5217\u306bPRIMARY KEY(\u4e3b\u30ad\u30fc)\u3092\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5<\/h2>\n
PRIMARY KEY\u306f2\u3064\u4ee5\u4e0a\u306e\u5217\u306b\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u90e8\u7f72\u3054\u3068\u306b\u5f93\u696d\u54e1\u756a\u53f7\u3092\u8a2d\u5b9a\u3057\u305f\u3044\u6642\u306f\u300c\u5f93\u696d\u54e1\u756a\u53f7\uff0b\u90e8\u7f72\u756a\u53f7\u300d\u3067\u4e00\u610f\u306b\u306a\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u3001\u8907\u6570\u306ePRIMARY KEY\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u306f\u3001
\n
<\/p>\n
\n- PRIMARY KEY (\u5217\u540d,\u5217\u540d…)<\/b><\/li>\n<\/ul>\n
<\/div>
\n\u3068\u30ab\u30f3\u30de\u533a\u5207\u308a\u3067\u8907\u6570\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u300c\u5f93\u696d\u54e1\u756a\u53f7(no)\uff0b\u90e8\u7f72\u756a\u53f7(department_no)\u300d\u306bPRIMARY KEY\u3092\u5b9a\u7fa9\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
CREATE TABLE sample3_employees (\r\n no int NOT NULL, -- \u5f93\u696d\u54e1\u756a\u53f7\r\n department_no int, -- \u90e8\u7f72\u756a\u53f7\r\n last_name varchar(255), -- \u540d\r\n first_name varchar(255), -- \u59d3\r\n PRIMARY KEY (no, department_no)\r\n);<\/pre>\n\u30c6\u30fc\u30d6\u30eb\u306e\u5b9a\u7fa9\uff1a<\/p>\n
mysql> desc sample3_employees;\r\n+---------------+--------------+------+-----+---------+-------+\r\n| Field | Type | Null | Key | Default | Extra |\r\n+---------------+--------------+------+-----+---------+-------+\r\n| no | int(11) | NO | PRI | NULL | |\r\n| department_no | int(11) | NO | PRI | 0 | |\r\n| last_name | varchar(255) | YES | | NULL | |\r\n| first_name | varchar(255) | YES | | NULL | |\r\n+---------------+--------------+------+-----+---------+-------+\r\n4 rows in set (0.00 sec)<\/pre>\n\u3053\u306e\u3088\u3046\u306b\u3001\u8907\u6570\u306ePRIMARY KEY\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u3044\u304b\u304b\u3067\u3057\u305f\u304b\uff1f<\/p>\n
\u4eca\u56de\u306fSQL\u306ePRIMARY KEY(\u4e3b\u30ad\u30fc)\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n
PRIMARY KEY\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u691c\u7d22\u306e\u30b9\u30d4\u30fc\u30c9\u3092\u683c\u6bb5\u306b\u65e9\u304f\u3057\u305f\u308a\u3001\u30c6\u30fc\u30d6\u30eb\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
PRIMARY KEY\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30c6\u30fc\u30d6\u30eb\u8a2d\u8a08\u3092\u3059\u308b\u4e0a\u3067\u5fc5\u9808\u306e\u30b9\u30ad\u30eb\u306a\u306e\u3067\u3001\u305c\u3072\u53d6\u5f97\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u3057\u3066\u3001PRIMARY KEY\u306e\u4f7f\u3044\u65b9\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3053\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f\uff01\u30b7\u30b9\u30c6\u30e0\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30aa\u30aa\u30a4\u30b7\u3067\u3059\u3002 SQL\u306ePRIMARY KEY(\u4e3b\u30ad\u30fc)\u3092\u3054\u5b58\u77e5\u3067\u3059\u304b\uff1f PRIMARY KEY\u306e\u4f7f\u3044\u304b\u305f\u3092\u899a\u3048\u308b\u3068\u3001\u9ad8\u901f\u306b\u30c6\u30fc\u30d6\u30eb\u30c7\u30fc\u30bf\u306e\u691c\u7d22\u304c\u5b9f\u884c\u3067\u304d\u305f\u308a\u3001\u6574\u5408\u6027\u306e\u53d6\u308c\u305f\u30c7\u30fc\u30bf\u3092\u4f5c\u6210\u3059 […]<\/p>\n","protected":false},"author":4,"featured_media":52383,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[1248],"tags":[1315,1246],"class_list":["post-52356","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql","tag-primary-key","tag-sql"],"acf":[],"yoast_head":"\n
\u3010SQL\u5165\u9580\u3011PRIMARY KEY(\u4e3b\u30ad\u30fc)\u5236\u7d04\u3068\u306f\uff1f\u8ffd\u52a0\u3084\u524a\u9664\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010SQL\u5165\u9580\u3011PRIMARY KEY(\u4e3b\u30ad\u30fc)\u5236\u7d04\u3068\u306f\uff1f\u8ffd\u52a0\u3084\u524a\u9664\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sejuku.net\/blog\/52356\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010SQL\u5165\u9580\u3011PRIMARY KEY(\u4e3b\u30ad\u30fc)\u5236\u7d04\u3068\u306f\uff1f\u8ffd\u52a0\u3084\u524a\u9664\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010SQL\u5165\u9580\u3011PRIMARY KEY(\u4e3b\u30ad\u30fc)\u5236\u7d04\u3068\u306f\uff1f\u8ffd\u52a0\u3084\u524a\u9664\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac 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\n <\/div>\n