{"id":900,"date":"2012-02-03T19:50:55","date_gmt":"2012-02-03T10:50:55","guid":{"rendered":"http:\/\/www.key-p.com\/blog\/staff\/?p=900"},"modified":"2012-02-06T09:06:30","modified_gmt":"2012-02-06T00:06:30","slug":"sql%e3%81%a7%e9%87%8d%e8%a4%87%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e4%b8%80%e3%81%a4%e3%81%a0%e3%81%91%e6%ae%8b%e3%81%97%e3%81%a6%e5%89%8a%e9%99%a4%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.key-p.com\/blog\/staff\/archives\/900","title":{"rendered":"SQL\u3067\u91cd\u8907\u30c7\u30fc\u30bf\u3092\u4e00\u3064\u3060\u3051\u6b8b\u3057\u3066\u524a\u9664\u3059\u308b"},"content":{"rendered":"

\n\u3053\u3093\u306b\u3061\u306f\u3001\u5e38\u89d2\u3067\u3059\u3002
\n\u3068\u3044\u3046\u304b\u3001\u521d\u6295\u7a3f\u306a\u306e\u3067\u306f\u3058\u3081\u307e\u3057\u3066\u3001\u3067\u3059\u3002
\n
\n\u540d\u524d\u306f\u3001\u5e38\u89d2\uff08\u3064\u306d\u305a\u307f\uff09\u3068\u8aad\u307f\u307e\u3059\u3002
\n\u30c9<\/strong>\u7530\u820e<\/a>\u51fa\u8eab\u3067\u3001\u5730\u5143\u3067\u306f\u305d\u3053\u305d\u3053\u3042\u308a\u3075\u308c\u305f\u540d\u524d\u3067\u3059\u304c\u3001\u795e\u6238\u306b\u51fa\u3066\u304d\u3066\u304b\u3089\u306f\u3001\u5f1f\u305f\u3061\u4ee5\u5916\u306b\u540c\u3058\u82d7\u5b57\u306e\u4eba\u9593\u306b\u4f1a\u3063\u305f\u3053\u3068\u306f\u306a\u3044\u3067\u3059\u3002
\n\u52a0\u3048\u3066\u3001\u5927\u4f53\u521d\u5bfe\u9762\u306e\u4eba\u306f\u300c\u3064\u306d\u304b\u3069\u3055\u3093\u300d\u3068\u547c\u3076\u306e\u3067\u3001\u6bce\u56de\u7a81\u3063\u8fbc\u3080\u306e\u304c\u5104\u52ab\u306b\u306a\u308a\u307e\u3059\u3002\uff08\u5b85\u914d\u306e\u4eba\u3068\u304b\u306b\u5bfe\u3057\u3066\u306f\u3001\u3082\u3046\u8ae6\u3081\u3066\u3044\u307e\u3059\uff09
\n
\n\u3055\u3066\u3001\u8a18\u5ff5\u3059\u3079\u304d\u521d\u6295\u7a3f\u306e\u30cd\u30bf\u306a\u306e\u3067\u3059\u304c\u30fb\u30fb\u30fb\u4f55\u306b\u3057\u3088\u3046\u3002
\n\u8003\u3048\u3066\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u66f8\u304f\u3053\u3068\u304c\u306a\u3044\u3067\u3059\u3002
\n
\n\u3067\u306f\u683c\u597d\u3064\u304b\u306a\u3044\u306e\u3067\u3001\u4ee5\u524d\u4ed5\u4e8b\u3067\u4f7f\u3063\u305f\u3001\u4fbf\u5229\u3060\u3068\u601d\u3063\u305fSQL\u6587\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002
\n\u3069\u3093\u306a\u4e8b\u3092\u3059\u308b\u306e\u304b\u306f\u3001\u30bf\u30a4\u30c8\u30eb\u3092\u898b\u3066\u306d\u3002
\n\u5c11\u3057\u3060\u3051\u3069\u3046\u3044\u3046\u3053\u3068\u304b\u8aac\u660e\u3059\u308b\u3068\u3001
\nDB\u4e0a\u3067\u3001\u7279\u5b9a\u306e\u5024\u304c\u91cd\u8907\u3057\u3066\u3044\u308b\u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u3001\u305d\u308c\u3092\u4e00\u3064\u3060\u3051\u6b8b\u3057\u3066\u3001\u6b8b\u308a\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306b\u306f\uff1f\u3068\u3044\u3046\u4e8b\u3067\u3059\u3002
\n
\nDelete t1
\nFrom \u524a\u9664\u3057\u305f\u3044\u30c7\u30fc\u30bf\u306e\u30c6\u30fc\u30d6\u30eb t1
\nWhere t1.ID\u306a\u3069\u6570\u5024\u7cfb\u306e\u30d5\u30a3\u30fc\u30eb\u30c9(\u4ee5\u4e0b\u3001\u3010ID\u3011\u3068\u3057\u307e\u3059) > (
\nSelect Min(t2.ID)
\nFrom \u524a\u9664\u3057\u305f\u3044\u30c7\u30fc\u30bf\u306e\u30c6\u30fc\u30d6\u30eb t2\u3000\uff08t1\u3068\u540c\u3058\u30c6\u30fc\u30d6\u30eb\uff09
\nWhere
\nt1.\u91cd\u8907\u306e\u6761\u4ef6\u3068\u306a\u308b\u30d5\u30a3\u30fc\u30eb\u30c9A = t2.\u91cd\u8907\u306e\u6761\u4ef6\u3068\u306a\u308b\u30d5\u30a3\u30fc\u30eb\u30c9A
\nAnd (t1.\u91cd\u8907\u306e\u6761\u4ef6\u3068\u306a\u308b\u30d5\u30a3\u30fc\u30eb\u30c9B = t2.\u91cd\u8907\u306e\u6761\u4ef6\u3068\u306a\u308b\u30d5\u30a3\u30fc\u30eb\u30c9B
\n or (t1.\u91cd\u8907\u306e\u6761\u4ef6\u3068\u306a\u308b\u30d5\u30a3\u30fc\u30eb\u30c9B Is Null And t2.\u91cd\u8907\u306e\u6761\u4ef6\u3068\u306a\u308b\u30d5\u30a3\u30fc\u30eb\u30c9B Is Null))\u3000\u30fb\u30fb\u30fb\u3000\u203b
\nAnd \u2026
\nHaving Count(*) > 1
\n)
\n
\nt2\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u307b\u3046\u3067\u3001\u91cd\u8907\u3057\u305f\u30c7\u30fc\u30bf\u306e\u4e00\u89a7\u304c\u53d6\u5f97\u3055\u308c\u3066\u3001
\nt1\u306e\u307b\u3046\u306eWhere\u6587\u306e\u6240\u3067\u3001\u305d\u306e\u3046\u30611\u4ef6\u3060\u3051\u3092\u9664\u5916\u3057\u3066\u304f\u308c\u308b\u306e\u3067\u3001\u91cd\u8907\u30c7\u30fc\u30bf\u306e2\u4ef6\u76ee\u4ee5\u964d\u3060\u3051\u3092\u524a\u9664\u3067\u304d\u307e\u3059\u3002
\n\u9006\u306b\u3001
\nWhere t1.ID\u306a\u3069\u6570\u5024\u7cfb\u306e\u30d5\u30a3\u30fc\u30eb\u30c9(\u4ee5\u4e0b\u3001\u3010ID\u3011\u3068\u3057\u307e\u3059) > (
\n\u3092
\nWhere t1.ID\u306a\u3069\u6570\u5024\u7cfb\u306e\u30d5\u30a3\u30fc\u30eb\u30c9(\u4ee5\u4e0b\u3001\u3010ID\u3011\u3068\u3057\u307e\u3059) = (
\n\u306b\u5909\u3048\u308b\u3068\u3001\u91cd\u8907\u30c7\u30fc\u30bf\u30921\u4ef6\u3060\u3051\u53d6\u5f97\u3057\u3066\u304d\u307e\u3059\u306e\u3067\u3001Select\u6587\u306a\u3069\u3067\u3001\u91cd\u8907\u30c7\u30fc\u30bf\u3092\u7121\u8996\u3057\u305f\u30c7\u30fc\u30bf\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\u6642\u306b\u4fbf\u5229\u3067\u3059\u3002
\n
\n\u307e\u305f\u3001Where\u53e5\u3067\u4f7f\u3046\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u3001Null\u3092\u8a31\u53ef\u3057\u3066\u3044\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5834\u5408\u3001\u300c\uff1d\u300d\u3060\u3068\u304d\u3061\u3093\u3068\u5224\u5b9a\u3057\u3066\u304f\u308c\u306a\u3044\u306e\u3067\u203b\u306e\u90e8\u5206\u306e\u3088\u3046\u306b\u3001Is Null\u3092\u3084\u3063\u3066\u3084\u3089\u306a\u3044\u3068\u30c0\u30e1\u3067\u3059\u3002
\n
\nID\u306e\u90e8\u5206\u306b\u4f7f\u3046\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u3001\u30e6\u30cb\u30fc\u30af\u306a\u5024\u3092\u6301\u3063\u3066\u3044\u3066\u3001\u5fc5\u305a\u5024\u304c\u5165\u529b\u3055\u308c\u3066\u3044\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3042\u308c\u3070\u3001\u306a\u3093\u3067\u3082\u3044\u3044\u3067\u3059\u3002
\n\u305d\u3046\u3044\u3063\u305f\u985e\u306e\u5024\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f\u3001RowNum(ORACLE)\u3067\u3001\u756a\u53f7\u3092\u632f\u3063\u3066\u3042\u3052\u308c\u3070OK\u3067\u3059\u3002
\n\u21d2SQLServer\u306e\u5834\u5408\u306f\u3001Row_Number
\n\u3000MySQL\u306b\u306f\u3053\u3046\u3044\u3063\u305f\u3082\u306e\u304c\u306a\u3044\u3088\u3046\u306a\u306e\u3067\u3001
\n\u3000set @row_num = 0;
\n\u3000select (@row_num:=@row_num+1) as row_number, col1
\n\u3000from tbl1;
\n\u3000\u3068\u3044\u3063\u305f\u5177\u5408\u306b\u81ea\u524d\u3067\u3064\u3051\u3066\u3084\u3089\u306d\u3070\u3044\u3051\u307e\u305b\u3093\u3002
\n\u4f46\u3057\u3001\u3053\u308c\u3092\u4f7f\u3046\u3068\u51e6\u7406\u304c\u534a\u7aef\u306a\u304f\u91cd\u304f\u306a\u308b\u306e\u3067\u30011000\u4ef6\u7a0b\u5ea6\u306a\u3089\u3044\u3044\u3051\u3069\u30011\u4e0710\u4e07\u306b\u306a\u308b\u3068\u3001\u6570\u5341\u5206\u6570\u6642\u9593\u3001\u305d\u308c\u4ee5\u4e0a\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u3001\u3042\u307e\u308a\u304a\u52e7\u3081\u3067\u304d\u306a\u3044\u3067\u3059\u3002
\n\u306a\u306e\u3067\u3001DB\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u308b\u3068\u304d\u306b\u306f\u3001\u30e6\u30cb\u30fc\u30afID\u3092\u4e00\u3064\u3064\u3051\u3066\u3084\u308a\u307e\u3057\u3087\u3046\u3002
\n\u4ed6\u3001\u6b8b\u30591\u4ef6\u3092\u3069\u308c\u306b\u3059\u308b\u306e\u304b\u306f\u3001\u6700\u521d\u306b\u304d\u3061\u3093\u3068\u6c7a\u3081\u3066\u304a\u304b\u306a\u3044\u3068\u6ce3\u304d\u3092\u307f\u308b\u30cf\u30e1\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u306e\u3067\u3001\u305d\u306e\u8fba\u306f\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002
\n
\n\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb
\n
\nSQL\u3063\u3066\u3001\u52c9\u5f37\u3057\u59cb\u3081\u305f\u9803\u306f\u4f55\u304c\u306a\u306b\u3084\u3089\u3055\u3063\u3071\u308a\u308f\u304b\u3089\u306a\u304b\u3063\u305f\u3093\u3067\u3059\u304c\u3001\u7406\u89e3\u3057\u59cb\u3081\u3066\u304f\u308b\u3068\u3001\u30d1\u30ba\u30eb\u307f\u305f\u3044\u3067\u9762\u767d\u3044\u3067\u3059\u3088\u306d\uff1f\uff08\u50d5\u3060\u3051\uff1f\uff09
\n\u8907\u96d1\u306a\u62bd\u51fa\u304c\u3046\u307e\u304f\u3044\u3063\u305f\u6642\u3068\u304b\u3001\u304a\u3082\u308f\u305a\u3001\u300c\u3088\u3063\u3057\u3083\uff01\u300d\u3063\u3066\u306a\u3063\u305f\u308a\u3002
\n\u307e\u3042\u3001\u305d\u308c\u306fSQL\u306b\u9650\u3063\u305f\u8a71\u3067\u306f\u306a\u3044\u3093\u3067\u3059\u3051\u3069\u306d\u3002
\n
\n\u3053\u308c\u304b\u3089\u3082\u3001\u3061\u3087\u304f\u3061\u3087\u304f\u66f8\u3044\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308b\u30fb\u30fb\u30fb\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u305d\u306e\u6642\u306f\u307e\u305f\u304a\u4ed8\u304d\u5408\u3044\u3044\u305f\u3060\u3051\u308b\u3068\u3042\u308a\u304c\u305f\u3044\u3067\u3059\u3002
\n\u6b21\u66f8\u304f\u306e\u306fJava\u304bPHP\u304b\u3001\u3042\u308b\u3044\u306fAndroid\u304b\u30fb\u30fb\u30fb\u3042\u308b\u3044\u306f\u305d\u3046\u3044\u3063\u305f\u6280\u8853\u7684\u306a\u3053\u3068\u304b\u3089\u96e2\u308c\u308b\u306e\u304b\u3002
\n\u307e\u3042\u4f55\u304b\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u304c\u3002\u3002\u3002
\n
\n<\/p>\n","protected":false},"excerpt":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\u3001\u5e38\u89d2\u3067\u3059\u3002 \u3068\u3044\u3046\u304b\u3001\u521d\u6295\u7a3f\u306a\u306e\u3067\u306f\u3058\u3081\u307e\u3057\u3066\u3001\u3067\u3059\u3002 \u540d\u524d\u306f\u3001\u5e38\u89d2 … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":29,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10,1],"tags":[],"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts\/900"}],"collection":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/users\/29"}],"replies":[{"embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/comments?post=900"}],"version-history":[{"count":4,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts\/900\/revisions"}],"predecessor-version":[{"id":926,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts\/900\/revisions\/926"}],"wp:attachment":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/media?parent=900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/categories?post=900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/tags?post=900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}