{"id":6784,"date":"2024-02-16T19:38:23","date_gmt":"2024-02-16T10:38:23","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=6784"},"modified":"2024-03-07T18:48:39","modified_gmt":"2024-03-07T09:48:39","slug":"sql-inner-join","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/sql-inner-join\/","title":{"rendered":"SQL\u306e\u300cINNER JOIN\u300d\u3092\u57fa\u790e\u304b\u3089\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac"},"content":{"rendered":"

\u300cJOIN\u300d\u53e5\u306f\u3001\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u307e\u3068\u3081\u308b\u300c\u30c6\u30fc\u30d6\u30eb\u7d50\u5408\u300d\u3092\u884c\u3046\u30af\u30a8\u30ea\uff08\u547d\u4ee4\uff09\u3067\u3001\u4e3b\u306bSELECT\u6587\u3068\u4f75\u7528\u3057\u3066\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u7684\u306b\u62bd\u51fa\u3059\u308b\u306e\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002JOIN\u53e5<\/a>\u306f\u7528\u9014\u306b\u3088\u3063\u3066\u5927\u304d\u304f5\u3064\u306b\u5206\u3051\u3089\u308c\u307e\u3059\u304c\u3001\u306a\u304b\u3067\u3082\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u64cd\u4f5c\u3067\u91cd\u5b9d\u3055\u308c\u308b\u306e\u304c\u300cINNER JOIN\u300d\u53e5\u3067\u3059\u3002<\/p>\n

\u672c\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306a\u300cINNER JOIN\u300d\u53e5\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3068\u3001\u305d\u306e\u5177\u4f53\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u4e2d\u5fc3\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n

\u305d\u3082\u305d\u3082\u300cJOIN\u300d\u53e5\u3068\u306f\uff1f<\/h2>\n\n\n

SQL\u306e\u300cJOIN\u300d\u53e5\u3068\u306f\u3001\u7570\u306a\u308b\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u30c7\u30fc\u30bf\u3092\u95a2\u9023\u4ed8\u3051\u308b\u30af\u30a8\u30ea\u3067\u3059\u3002\u30c6\u30fc\u30d6\u30eb\u7d50\u5408\u3055\u305b\u308b\u3053\u3068\u30672\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u30921\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u3088\u3046\u306b\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u4e00\u5ea6\u306e\u691c\u7d22\u3067\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002JOIN\u53e5\u306b\u306f5\u7a2e\u985e\u3042\u308a\u3001\u53d6\u5f97\u3059\u308b\u30c7\u30fc\u30bf\u306e\u6027\u8cea\u3084\u7528\u9014\u306b\u5fdc\u3058\u3066\u4f7f\u3044\u5206\u3051\u307e\u3059\u3002<\/p>\n\n\n

INNER JOIN\uff08\u5185\u90e8\u7d50\u5408\uff09\u3068\u306f<\/h2>\n\n\n

\u300cINNER JOIN\u300d\u53e5\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30e0\u3067\u5024\u304c\u4e00\u81f4\u3059\u308b\u5834\u5408\u306b\u305d\u306e\u30ec\u30b3\u30fc\u30c9\u306e\u307f\u3092\u7d50\u5408\u3055\u305b\u308b\u30af\u30a8\u30ea\u3067\u3059\u3002\u3053\u306e\u5171\u901a\u306e\u5024\u3092\u6301\u3064\u3068\u3044\u3046\u7d50\u5408\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u30ec\u30b3\u30fc\u30c9\u306f\u9664\u5916\u3055\u308c\u307e\u3059\u3002\u3061\u306a\u307f\u306b\u3001\u5358\u306b\u300cJOIN\u300d\u3068\u8a18\u8ff0\u3057\u305f\u5834\u5408\u3082\u300cINNER JOIN\u300d\u53e5\u6271\u3044\u306b\u306a\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n\n\n\n

\u56f3\uff1a\u5185\u90e8\u7d50\u5408\uff08INNER JOIN\u53e5\uff09\u306e\u30a4\u30e1\u30fc\u30b8<\/strong><\/p>\n

\n

\u7d50\u5408\u6761\u4ef6\u306f\u3001\u7b49\u5024\u7d50\u5408 \uff08=\uff09\u306e\u307b\u304b\u306b\u3001\u975e\u7b49\u5024\u7d50\u5408\uff08>\u3001 <\u3001 <>, !=\u3001…\uff09\u3082\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<\/div>\n

\u3053\u3053\u304b\u3089\u306f\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u3066\u305d\u308c\u305e\u308c\u306e\u7a2e\u985e\u3068\u9069\u3057\u305f\u7528\u9014\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n

\n

\u3042\u306a\u305f\u306e\u3054\u5e0c\u671b\u306b\u6cbf\u3063\u305f\u6848\u4ef6\u304c\u5fc5\u305a<\/span>\u898b\u3064\u304b\u308a\u307e\u3059
\u3010\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u5411\u3051\u3011\u9ad8\u53ce\u5165<\/span>\u30fb<\/span>\u597d\u5f85\u9047<\/span>\u306e\u6848\u4ef6\u3092\u3054\u7d39\u4ecb<\/span><\/p><\/a>\n<\/div>\n\n

\"TECH<\/a>\n<\/div>\n\n
\n

\u226b\u307e\u305a\u306f\u7c21\u535860<\/span>\u79d2\u3067\u7121\u6599\u304a\u554f\u3044\u5408\u308f\u305b<\/span>\u304b\u3089\u226a<\/p><\/a>\n<\/div>\n\n\n\n

\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb<\/h2>\n\n\n

\u300cINNER JOIN\u300d\u53e5\u306e\u4f7f\u3044\u65b9\u306e\u8aac\u660e\u306b\u306f\u3001\u30b5\u30f3\u30d7\u30eb\u3068\u3057\u3066\u300c\u5f93\u696d\u54e1\u300d\u30c6\u30fc\u30d6\u30eb\u3068\u300c\u90e8\u7f72\u300d\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n\n

\u300cINNER JOIN\u300d\u53e5\u306e\u4f7f\u3044\u65b9\u306e\u8aac\u660e\u306b\u306f\u3001\u30b5\u30f3\u30d7\u30eb\u3068\u3057\u3066\u300c\u5f93\u696d\u54e1\u300d\u30c6\u30fc\u30d6\u30eb\u3068\u300c\u90e8\u7f72\u300d\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n\n\n

\u5f93\u696d\u54e1ID\uff08employee_id\uff09<\/strong><\/td>\u6c0f\u540d\uff08name\uff09<\/strong><\/td>\u90e8\u7f72ID\uff08dept_id\uff09<\/strong><\/td>\u5f79\u8077\uff08post\uff09<\/strong><\/td><\/tr>
1<\/td>\u963f\u90e8<\/td>5<\/td>3<\/td><\/tr>
2<\/td>\u83ca\u6c60<\/td>1<\/td>2<\/td><\/tr>
3<\/td>\u9234\u6728<\/td>6<\/td><\/td><\/tr>
4<\/td>\u7530\u4e2d<\/td>4<\/td>1<\/td><\/tr>
5<\/td>\u91ce\u6751<\/td>7<\/td><\/td><\/tr>
6<\/td>\u9577\u8c37\u5ddd<\/td>3<\/td><\/td><\/tr>
7<\/td>\u5c71\u7530<\/td>5<\/td>2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n

\u300cINNER JOIN\u300d\u53e5\u306e\u4f7f\u3044\u65b9\u306e\u8aac\u660e\u306b\u306f\u3001\u30b5\u30f3\u30d7\u30eb\u3068\u3057\u3066\u300c\u5f93\u696d\u54e1\u300d\u30c6\u30fc\u30d6\u30eb\u3068\u300c\u90e8\u7f72\u300d\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n\n\n

ID\uff08id\uff09<\/strong><\/td>\u90e8\u7f72\u540d\uff08dept_name\uff09<\/strong><\/td><\/tr>
1<\/td>\u7dcf\u52d9\u90e8<\/td><\/tr>
2<\/td>\u4eba\u4e8b\u90e8<\/td><\/tr>
3<\/td>\u7d4c\u7406\u90e8<\/td><\/tr>
4<\/td>\u55b6\u696d\u90e8<\/td><\/tr>
5<\/td>\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u90e8<\/td><\/tr>
6<\/td>\u60c5\u5831\u30b7\u30b9\u30c6\u30e0\u90e8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n

\u3010\u4f7f\u7528\u30a4\u30e1\u30fc\u30b8\u3011<\/strong><\/p>\n\n\n

SELECT \u30ab\u30e9\u30e0\u540d FROM \u30c6\u30fc\u30d6\u30ebA INNER JOIN \u30c6\u30fc\u30d6\u30ebB ON \u7d50\u5408\u6761\u4ef6;<\/strong><\/code><\/pre>\n\n\n
\u30c6\u30fc\u30d6\u30ebA\u304b\u3089\u53d6\u5f97\u3059\u308b\u30ab\u30e9\u30e0\u3092\u6307\u5b9a\u3057\u3001\u7d50\u5408\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c7\u30fc\u30bf\u304c\u30c6\u30fc\u30d6\u30ebB\u306b\u3042\u308b\u5834\u5408\u306f1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u3057\u3066\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u305d\u308c\u305e\u308c\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u30ad\u30fc\u3068\u306a\u308b\u30ab\u30e9\u30e0\u540d\u3092\u6307\u5b9a\u3059\u308b\u5f62\u5f0f\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n\n\n
SELECT \u30ab\u30e9\u30e0\u540d FROM \u30c6\u30fc\u30d6\u30ebA INNER JOIN \u30c6\u30fc\u30d6\u30ebB ON \u30c6\u30fc\u30d6\u30ebA.\u7d50\u5408\u30ad\u30fc1 = \u30c6\u30fc\u30d6\u30ebB.\u7d50\u5408\u30ad\u30fc2;<\/strong><\/code><\/pre>\n\n\n
\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n
\u3010\u88dc\u8db3\u3011\u30c6\u30fc\u30d6\u30eb\u306e\u6e96\u5099<\/h3>\n\n\n
\u203b\u308f\u304b\u308b\u4eba\u306f\u8aad\u307f\u98db\u3070\u3057\u3066OK<\/strong><\/span><\/p>\n\n\n
\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210<\/h4>\n\n\n
\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210\u306b\u306f\u3001\u5404\u30ab\u30e9\u30e0\u306e\u30c7\u30fc\u30bf\u578b\u306e\u6307\u5b9a\u3068\u4e3b\u30ad\u30fc\uff08\u30d7\u30e9\u30a4\u30de\u30ea\u30fc\u30ad\u30fc\uff09\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb\u3092SQL\u3067\u4f5c\u6210\u3059\u308b\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
\u25c6\u5f93\u696d\u54e1\uff08employee\uff09\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210<\/strong><\/p>\n\n\n
CREATE TABLE employee(\n employee_id INTEGER NOT NULL PRIMARY KEY, \n name VARCHAR,\n dept_id INTEGER,<\/strong>\n post INTEGER<\/strong>,\n);<\/strong><\/code><\/pre>\n\n\n
\u25c6\u90e8\u7f72\uff08department\uff09\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210<\/strong><\/p>\n\n\n
CREATE TABLE department(\n id INTEGER NOT NULL PRIMARY KEY, \n dept_name VARCHAR\n);<\/strong><\/code><\/pre>\n\n\n
\uff08\u88dc\u8db3\uff09\u983b\u51fa\u30c7\u30fc\u30bf\u578b<\/strong><\/p>\n\n\n
\u6570\u5024<\/td>integer<\/td><\/tr>
\u6587\u5b57\u5217<\/td>varchar<\/td><\/tr>
\u9577\u3044\u6587\u5b57\u5217<\/td>text<\/td><\/tr>
\u65e5\u4ed8<\/td>datetime<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u30c7\u30fc\u30bf\u306e\u8ffd\u52a0<\/h4>\n\n\n
\u30c6\u30fc\u30d6\u30eb\u304c\u5b8c\u6210\u3057\u305f\u3089\u5404\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30c7\u30fc\u30bf\u3092\u5165\u308c\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
\u25c6\u5f93\u696d\u54e1\uff08employee\uff09\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u30c7\u30fc\u30bf\u8ffd\u52a0<\/strong><\/p>\n\n\n
INSERT INTO employee (employee_id, name, dept_id, post) VALUES (1, '\u963f\u90e8', <\/strong>3);\nINSERT INTO employee (employee_id, name, dept_id, post<\/strong>) VALUES (2, '\u83ca\u6c60', <\/strong>2);\nINSERT INTO employee (employee_id, name, dept_id, post<\/strong>) VALUES (3, '\u9234\u6728');\nINSERT INTO employee (employee_id, name, dept_id, post<\/strong>) VALUES (4, '\u7530\u4e2d', <\/strong><\/strong>1);\nINSERT INTO employee (employee_id, name, dept_id, post<\/strong>) VALUES (5, '\u91ce\u6751');\nINSERT INTO employee (employee_id, name, dept_id, post<\/strong>) VALUES (6, '\u9577\u8c37\u5ddd');\nINSERT INTO employee (employee_id, name, dept_id, post<\/strong>) VALUES (7, '\u5c71\u7530', <\/strong>2<\/strong>);<\/strong><\/code><\/pre>\n\n\n
\u25c6\u90e8\u7f72\uff08department\uff09\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u30c7\u30fc\u30bf\u8ffd\u52a0<\/strong><\/p>\n\n\n
INSERT INTO department (id, dept_name) VALUES (1, '\u7dcf\u52d9\u90e8');\nINSERT INTO department (id, dept_name) VALUES (2, '\u4eba\u4e8b\u90e8');\nINSERT INTO department (id, dept_name) VALUES (3, '\u7d4c\u7406\u90e8');\nINSERT INTO department (id, dept_name) VALUES (4, '\u55b6\u696d\u90e8');\nINSERT INTO department (id, dept_name) VALUES (5, '\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u90e8');\nINSERT INTO department (id, dept_name) VALUES (6, '\u60c5\u5831\u30b7\u30b9\u30c6\u30e0\u90e8');<\/strong><\/code><\/pre>\n\n\n
\u4ee5\u4e0a\u3067\u30c6\u30fc\u30d6\u30eb\u306e\u6e96\u5099\u304c\u5b8c\u4e86\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n
INNER JOIN\u306e\u8a18\u8ff0\u65b9\u6cd5<\/h2>\n\n\n
\u300c\u5f93\u696d\u54e1\u300d\u30c6\u30fc\u30d6\u30eb\u306e\u300c\u90e8\u7f72ID\u300d\u30ab\u30e9\u30e0\u3068\u300c\u90e8\u7f72\u300d\u30c6\u30fc\u30d6\u30eb\u306e\u300cID\u300d\u30ab\u30e9\u30e0\u3092\u7d10\u3065\u3051\u3001\u7d50\u5408\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5834\u5408\u306b\u3001\u300c\u5f93\u696d\u54e1\u300d\u30c6\u30fc\u30d6\u30eb\u306e\u300c\u6c0f\u540d\u300d\u30ab\u30e9\u30e0\u3068\u300c\u90e8\u7f72\u300d\u30c6\u30fc\u30d6\u30eb\u306e\u300c\u90e8\u7f72\u540d\u300d\u30ab\u30e9\u30e0\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
\u3010\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n
SELECT employee.name, department.dept_name FROM employee INNER JOIN department ON employee.dept_id = department.id;<\/strong><\/code><\/pre>\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n
\u6c0f\u540d\uff08name\uff09<\/strong><\/td>\u90e8\u7f72\u540d\uff08dept_name\uff09<\/strong><\/td><\/tr>
\u963f\u90e8<\/td>\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u90e8<\/td><\/tr>
\u83ca\u6c60<\/td>\u7dcf\u52d9\u90e8<\/td><\/tr>
\u9234\u6728<\/td>\u60c5\u5831\u30b7\u30b9\u30c6\u30e0\u90e8<\/td><\/tr>
\u7530\u4e2d<\/td>\u55b6\u696d\u90e8<\/td><\/tr>
\u9577\u8c37\u5ddd<\/td>\u7d4c\u7406\u90e8<\/td><\/tr>
\u5c71\u7530<\/td>\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u90e8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
\u5171\u901a\u3059\u308b\u5024\u304c\u306a\u3044\u300c\u5f93\u696d\u54e1\u300d\u30c6\u30fc\u30d6\u30eb\u306e\u300c\u91ce\u6751\u300d\u3055\u3093\u3001\u300c\u90e8\u7f72\u300d\u30c6\u30fc\u30d6\u30eb\u306e\u300c\u4eba\u4e8b\u90e8\u300d\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n
\u203b\u4e0b\u8a18\u30b3\u30fc\u30c9\u3067\u3082\u540c\u3058\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n
SELECT employee.name, department.dept_name FROM employee,department WHERE employee.dept_id = department.id;<\/strong><\/code><\/pre>\n\n\n
\n
\u30ab\u30e9\u30e0\u540d\u306e\u8a18\u8ff0\u65b9\u6cd5<\/strong><\/p>\n
2\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u540d\u3067\u30ab\u30e9\u30e0\u540d\u306b\u91cd\u8907\u304c\u306a\u3044\u5834\u5408\u3001\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u7701\u7565\u3057\u3066\u3082\u53ef\u80fd\u3067\u3059\u304c\u3001\u30ab\u30e9\u30e0\u540d\u306f\u300c\u30c6\u30fc\u30d6\u30eb\u540d.\u30ab\u30e9\u30e0\u540d\u300d\u3068\u8a18\u8ff0\u3059\u308b\u3068\u53ef\u8aad\u6027\u304c\u4e0a\u304c\u308b\u306e\u3067\u304a\u3059\u3059\u3081\u3067\u3059\u3002\u30ab\u30e9\u30e0\u540d\u306b\u91cd\u8907\u304c\u3042\u308b\u306e\u306b\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u6307\u5b9a\u305b\u305a\u306b\u30ab\u30e9\u30e0\u540d\u306e\u307f\u3092\u8a18\u8ff0\u3059\u308b\u3068\u3001\u300cError: Column ‘\u30ab\u30e9\u30e0\u540d’ in field list is ambiguous\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/div>\n
\n
\u30a8\u30a4\u30ea\u30a2\u30b9\u540d\u306e\u6307\u5b9a\u65b9\u6cd5<\/strong><\/p>\n
\u300c\u30ab\u30e9\u30e0\u540d AS \u30a8\u30a4\u30ea\u30a2\u30b9\u540d\u300d\u3068\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u5168\u4f53\u306e\u8a18\u8ff0\u91cf\u3092\u6e1b\u3089\u305b\u305f\u308a\u3001\u30c6\u30fc\u30d6\u30eb\u3092\u898b\u5206\u3051\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n
ON\u306b\u306f\u8907\u6570\u306e\u6761\u4ef6\u304c\u66f8\u3051\u308b<\/h3>\n\n\n
JOIN\u53e5\u306b\u304a\u3051\u308b\u300cON\u300d\u53e5\u306f\u3001\u7d50\u5408\u6761\u4ef6\u3092\u8a18\u8ff0\u3057\u307e\u3059\u304c\u3001AND\u3084OR\u3067\u3064\u306a\u3052\u308b\u3053\u3068\u3067\u8907\u6570\u306e\u6761\u4ef6\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/span><\/span><\/p>\n\n\n
\u3010\u4f7f\u7528\u30a4\u30e1\u30fc\u30b8\u3011<\/strong><\/p>\n\n\n\n
SELECT \u30ab\u30e9\u30e0\u540d FROM \u30c6\u30fc\u30d6\u30ebA INNER JOIN \u30c6\u30fc\u30d6\u30ebB ON \u7d50\u5408\u6761\u4ef61 AND \u7d50\u5408\u6761\u4ef62;<\/strong><\/code><\/pre>\n\n\n\n
\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u306e\u691c\u7d22\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b<\/h3>\n\n\n
JOIN\u53e5\u306b\u304a\u3044\u3066\u3001ON\u53e5\u3082WHERE\u53e5\u3082\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b\u306e\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u304c\u3001\u300cON\u300d\u53e5\u306f\u7d50\u5408\u306e\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b\u610f\u5473\u5408\u3044\u3067\u4f7f\u7528\u3055\u308c\u308b\u4e00\u65b9\u3067\u300cWHERE\u300d\u53e5\u306f\u3001\u30c7\u30fc\u30bf\u306e\u62bd\u51fa\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b\u306e\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u57fa\u672c\u7684\u306b\u306f\u3001ON\u53e5\u3067\u6307\u5b9a\u3057\u305f\u6761\u4ef6\u3067\u30c6\u30fc\u30d6\u30eb\u7d50\u5408\u3092\u884c\u3063\u3066\u304b\u3089\u3001WHERE\u53e5\u3067\u6307\u5b9a\u3057\u305f\u6761\u4ef6\u3067\u30c7\u30fc\u30bf\u3092\u7d5e\u308a\u8fbc\u307f\u307e\u3059\u3002\u203b\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u306b\u3088\u3063\u3066\u306f\u3001\u9006\u306e\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/span><\/p>\n
\u30c6\u30fc\u30d6\u30eb\u7d50\u5408\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u306a\u304b\u304b\u3089\u3001\u62bd\u51fa\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u7c21\u5358\u306b\u3044\u3063\u3066\u3057\u307e\u3048\u3070\u3001\u30c6\u30fc\u30d6\u30eb\u7d50\u5408\u524d\u306e\u6761\u4ef6\u6307\u5b9a\u3092\u300cON\u53e5\u300d\u3001\u30c6\u30fc\u30d6\u30eb\u7d50\u5408\u5f8c\u306e\u6761\u4ef6\u6307\u5b9a\u3092\u300cWHERE\u53e5\u300d\u3067\u8a18\u8ff0\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/span><\/span><\/p>\n
\u4e0b\u8a18\u30b3\u30fc\u30c9\u30676\u90e8\u7f72\u306b\u5c5e\u3057\u3001\u5f79\u8077\u304c\u300c2\u300d\u306e\u5f93\u696d\u54e1\u3092\u62bd\u51fa\u3057\u307e\u3059\u3002<\/p>\n
\u3010\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n
SELECT employee.name, department.dept_name FROM employee INNER JOIN department ON employee.dept_id = department.id WHERE employee.post = 2;<\/strong><\/code><\/pre>\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n
\u6c0f\u540d\uff08name\uff09<\/strong><\/td>\u90e8\u7f72\u540d\uff08dept_name\uff09<\/strong><\/td><\/tr>
\u83ca\u6c60<\/td>\u7dcf\u52d9\u90e8<\/td><\/tr>
\u5c71\u7530<\/td>\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u90e8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
\u3053\u3053\u3067\u3001\u5185\u90e8\u7d50\u5408\u306e\u5834\u5408\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c7\u30fc\u30bf\u3060\u3051\u3092\u53d6\u5f97\u3059\u308b\u3069\u3061\u3089\u3092\u4f7f\u3063\u3066\u3082\u540c\u3058\u7d50\u679c\u304c\u751f\u307e\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u5916\u90e8\u7d50\u5408\u3067\u306fON\u53e5\u3092\u4f7f\u3046\u304bWHERE\u53e5\u3092\u4f7f\u3046\u304b\u3067\u62bd\u51fa\u7d50\u679c\u304c\u5909\u308f\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/span><\/span><\/p>\n
\u305d\u3046\u3044\u3063\u305f\u70b9\u3068\u3001\u53ef\u8aad\u6027\u3092\u8003\u616e\u3057\u3001\u7d50\u5408\u6761\u4ef6\u306f\u300cON\u300d\u53e5\u3001\u62bd\u51fa\u30c7\u30fc\u30bf\u306e\u7d5e\u308a\u8fbc\u307f\u6761\u4ef6\u306f\u300cWHERE\u300d\u53e5\u306b\u8a18\u8ff0\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/span><\/span><\/p>\n
\u3061\u306a\u307f\u306b\u3001WHERE\u53e5\u306b\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u3001\u5185\u90e8\u7d50\u5408\u3068\u5916\u90e8\u7d50\u5408\u3067\u540c\u3058\u7d50\u679c\u304c\u53d6\u5f97\u3067\u304d\u307e\u3059\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u9762\u3092\u8003\u616e\u3059\u308b\u3068\u3001\u5185\u90e8\u7d50\u5408\u306e\u65b9\u304c\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/span><\/span><\/p>\n\n\n
\u5185\u90e8\u7d50\u5408\uff08INNER JOIN\u53e5\uff09\u3092\u4f7f\u3046\u5834\u9762<\/h2>\n\n\n
\u5185\u90e8\u7d50\u5408\uff08INNER JOIN\u53e5\uff09\u306f\u30c7\u30fc\u30bf\u96c6\u8a08\u3084\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u306e\u7d71\u5408\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n