{"id":182,"date":"2014-05-31T22:59:10","date_gmt":"2014-05-31T13:59:10","guid":{"rendered":"http:\/\/kei0310.info\/?p=182"},"modified":"2014-05-31T23:06:48","modified_gmt":"2014-05-31T14:06:48","slug":"rdbsql-join%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/kei0310.info\/?p=182","title":{"rendered":"[RDB][SQL] JOIN\u306b\u3064\u3044\u3066"},"content":{"rendered":"

JOIN\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

\u307e\u305a\u3001\u4ee5\u4e0b\u306e2\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308a\u307e\u3059\u3002
\n\u7c21\u5358\u306a\u30c6\u30fc\u30d6\u30eb\u306a\u306e\u3067\u3001\u5b9a\u7fa9\u306f\u5272\u611b\u3067\u3059\u3002<\/p>\n

\u5546\u54c1\u30de\u30b9\u30bf\u3068\u3001\u58f2\u4e0a\u660e\u7d30\u3068\u3044\u3046\u3088\u304f\u3042\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n

\"PostgreSQL_JOIN_01\"<\/a> \"PostgreSQL_JOIN_02\"<\/a><\/p>\n

\u25cf\u5185\u90e8\u7d50\u5408(inner join)
\n\u5185\u90e8\u7d50\u5408\u306f\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u3046\u3061\u3001\u4e00\u81f4\u3059\u308b\u884c\u306e\u307f\u62bd\u51fa\u3057\u307e\u3059\u3002<\/p>\n

(\u4f8b)\u5546\u54c1\u30de\u30b9\u30bf\u3068\u58f2\u4e0a\u660e\u7d30\u3092\u300cid\u300d\u3067\u5185\u90e8\u7d50\u5408\u3059\u308bSQL<\/p>\n

\r\nselect\r\n  *\r\nfrom\r\n  \u5546\u54c1\u30de\u30b9\u30bf T1\r\ninner join\r\n  \u58f2\u4e0a\u660e\u7d30 T2\r\non\r\n  T1.id = T2.id\r\n<\/pre>\n
<\/p>\n
\r\n(\u7d50\u679c)\r\n id |   name   | price |        date         | id\r\n----+----------+-------+---------------------+----\r\n  1 | \u304a\u83d3\u5b50   |   100 | 2014-05-02 22:01:00 |  1\r\n  5 | \u30c9\u30ea\u30f3\u30af |   150 | 2014-05-05 11:13:00 |  5\r\n  3 | \u96d1\u8a8c     |   500 | 2014-05-13 09:08:00 |  3\r\n  3 | \u96d1\u8a8c     |   500 | 2014-05-13 23:31:00 |  3\r\n  1 | \u304a\u83d3\u5b50   |   100 | 2014-05-22 05:01:00 |  1\r\n(5 \u884c)\r\n<\/tt>\r\n<\/pre>\n
\u25cf\u5916\u90e8\u7d50\u5408(outer join)
\n\u5916\u90e8\u7d50\u5408\u306f\u3001\u7247\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u3057\u304b\u7121\u3044\u30c7\u30fc\u30bf\u3082\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
\u6b86\u3069\u306e\u5834\u5408\u3001left outer join\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u5de6\u5916\u90e8\u7d50\u5408\u3092\u4f8b\u306b\u3042\u3052\u307e\u3059\u3002
\nleft outer join\u306e\u5834\u5408\u306f\u3001\u5de6\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306f\u5168\u91cf\u51fa\u529b\u3057\u3001
\n\u53f3\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306f\u3001\u5de6\u5074\u30c6\u30fc\u30d6\u30eb\u3068\u7d50\u5408\u3067\u304d\u305f\u3082\u306e\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
\uff08\u4f8b\uff09\u58f2\u4e0a\u660e\u7d30\u3068\u5546\u54c1\u30de\u30b9\u30bf\u3092\u300cid\u300d\u3067\u5de6\u5916\u90e8\u7d50\u5408\u3059\u308bSQL<\/p>\n
\r\nselect\r\n  *\r\nfrom\r\n  \u5546\u54c1\u30de\u30b9\u30bf T1\r\nleft outer join\r\n  \u58f2\u4e0a\u660e\u7d30 T2\r\non\r\n  T1.id = T2.id\r\n<\/pre>\n
<\/p>\n
\r\n(\u7d50\u679c)\r\n id |   name   | price |        date         | id\r\n----+----------+-------+---------------------+----\r\n  1 | \u304a\u83d3\u5b50   |   100 | 2014-05-02 22:01:00 |  1\r\n  5 | \u30c9\u30ea\u30f3\u30af |   150 | 2014-05-05 11:13:00 |  5\r\n  3 | \u96d1\u8a8c     |   500 | 2014-05-13 09:08:00 |  3\r\n  3 | \u96d1\u8a8c     |   500 | 2014-05-13 23:31:00 |  3\r\n  1 | \u304a\u83d3\u5b50   |   100 | 2014-05-22 05:01:00 |  1\r\n  2 | \u925b\u7b46     |   120 |                     |\r\n  4 | \u6d88\u3057\u30b4\u30e0 |    50 |                     |\r\n(7 \u884c)\r\n<\/pre>\n
<\/tt><\/p>\n
\u6700\u5f8c\u306b\u3001\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u60c5\u5831\u3092\u62bd\u51fa\u3057\u3066\u307f\u307e\u3059\u3002
\n\u300c\u58f2\u4e0a\u660e\u7d30\u306e\u5546\u54c1\u6bce\u306e\u7dcf\u58f2\u4e0a\u3092\u62bd\u51fa\u3059\u308b\u3002\u300d<\/p>\n
\r\nselect\r\n  T1.id\r\n  , T2.name\r\n  , sum(T2.price)\r\nfrom\r\n  \u58f2\u4e0a\u660e\u7d30 T1\r\ninner join\r\n  \u5546\u54c1\u30de\u30b9\u30bf T2\r\non\r\n  T1.id = T2.id\r\ngroup by\r\n  T1.id\r\n  , T2.name\r\n<\/pre>\n
<\/p>\n
\r\n\uff08\u7d50\u679c\uff09\r\n id |   name   | sum\r\n----+----------+------\r\n  1 | \u304a\u83d3\u5b50   |  200\r\n  5 | \u30c9\u30ea\u30f3\u30af |  150\r\n  3 | \u96d1\u8a8c     | 1000\r\n(3 \u884c)\r\n<\/tt>\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
JOIN\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002 \u307e\u305a\u3001\u4ee5\u4e0b\u306e2\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308a\u307e\u3059\u3002 \u7c21\u5358\u306a\u30c6\u30fc\u30d6\u30eb\u306a\u306e\u3067\u3001\u5b9a\u7fa9\u306f\u5272\u611b\u3067\u3059\u3002 \u5546\u54c1\u30de\u30b9\u30bf\u3068\u3001\u58f2\u4e0a\u660e\u7d30\u3068\u3044\u3046\u3088\u304f\u3042\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002 \u25cf\u5185\u90e8\u7d50\u5408(inner join) \u5185\u90e8\u7d50\u5408\u306f\u30012\u3064\u306e\u30c6\u30fc […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[37,10],"tags":[43,41,42,184],"_links":{"self":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts\/182"}],"collection":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=182"}],"version-history":[{"count":7,"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts\/182\/revisions"}],"predecessor-version":[{"id":191,"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts\/182\/revisions\/191"}],"wp:attachment":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=182"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}