{"id":72910,"date":"2021-08-01T08:07:23","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=72910"},"modified":"2024-05-06T11:51:55","modified_gmt":"2024-05-06T02:51:55","slug":"sql%e3%81%a7%e6%95%b0%e3%82%92%e6%95%b0%e3%81%88%e3%82%88%e3%81%86count%e9%96%a2%e6%95%b0%e3%81%ae%e5%9f%ba%e6%9c%ac%e3%81%8b%e3%82%89%e5%bf%9c%e7%94%a8%e3%81%be%e3%81%a7","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/72910","title":{"rendered":"SQL\u3067\u6570\u3092\u6570\u3048\u3088\u3046!COUNT\u95a2\u6570\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067!"},"content":{"rendered":"<p>\u307f\u306a\u3055\u3093\u3053\u3093\u306b\u3061\u306f!<\/p>\n<p>\u4eca\u56de\u306fSQL\u306e\u4e2d\u3067\u3082\u3001\u591a\u7528\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3067\u3042\u308d\u3046\u57fa\u672c\u547d\u4ee4COUNT\u95a2\u6570\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"box01\">\n<ul>\n<li><b>COUNT\u306e\u4f7f\u3044\u65b9!<\/b><\/li>\n<li><b>\u91cd\u8907\u3092\u56de\u907f\u3059\u308b\u306b\u306f?<\/b><\/li>\n<li><b>\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306bCOUNT\u3092\u4f7f\u304a\u3046!<\/b><\/li>\n<li><b>\u4ed6\u306b\u3082\u3042\u308b!\u96c6\u8a08\u95a2\u6570\u305f\u3061!<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u307e\u305a\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u304b\u3089\u5165\u308a\u3001\u300c\u91cd\u8907\u56de\u907f\u300d\u3084\u300c\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u300d\u300c\u305d\u306e\u4ed6\u96c6\u8a08\u95a2\u6570\u300d\u306a\u3069\u3001\u9700\u8981\u306e\u9ad8\u3044\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u3092\u898b\u3066\u3044\u304f\u3053\u3068\u306b\u3057\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3088\u308d\u3057\u304f\u304a\u9858\u3044\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<h2>COUNT\u3068\u306f<\/h2>\n<p>COUNT\u3068\u306f\u96c6\u8a08\u95a2\u6570\u306e\u4e00\u3064\u3067\u3001\u4e00\u8a00\u3067\u8a00\u3048\u3070<b>\u6570\u3092\u6570\u3048\u308b\u95a2\u6570<\/b>\u3067\u3059\u3002\u307e\u305f\u96c6\u8a08\u95a2\u6570\u3068\u306f\u300c\u5e73\u5747\u5024\u300d\u300c\u5408\u8a08\u5024\u300d\u306a\u3069\u4f55\u304b\u3092\u96c6\u8a08\u3059\u308b\u6642\u306b\u4f7f\u7528\u3059\u308b\u95a2\u6570\u305f\u3061\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n<p>COUNT\u4ee5\u5916\u306e\u96c6\u8a08\u95a2\u6570\u306f\u6700\u5f8c\u306b\u8aac\u660e\u3059\u308b\u3068\u3057\u3066\u3001\u307e\u305a\u306fCOUNT\u95a2\u6570\u306b\u3064\u3044\u3066\u898b\u3066\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>COUNT\u306e\u4f7f\u3044\u65b9!<\/h2>\n<p>\u4f7f\u3044\u65b9\u306f\u975e\u5e38\u306b\u7c21\u5358\u3067\u3059\u3002\u4f8b\u3048\u3070\u30e6\u30fc\u30b6\u30fc\u306e\u30c7\u30fc\u30bf\u304c\u5165\u3063\u3066\u3044\u308b\u3001user\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u3063\u305f\u3068\u3057\u3066\u3001\u305d\u306e\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3057\u305f\u3044\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u308c\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5165\u529b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u5b9f\u884c\u30b3\u30de\u30f3\u30c9:<\/p>\n<pre class=\"decode:true \" >SELECT COUNT( * ) FROM user;<\/pre>\n<p>\u7d50\u679c:<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true \" >+----------+\r\n| count(*) |\r\n+----------+\r\n|        3 |\r\n+----------+<\/pre>\n<p>\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc3\u4eba\u5206\u306e\u30c7\u30fc\u30bf\u304c\u5165\u3063\u3066\u3044\u308b\u5834\u5408\u306a\u3089\u3001\u3053\u306e\u3088\u3046\u306b6\u3068\u8868\u793a\u3055\u308c\u308b\u306f\u305a\u3067\u3059\u3002\u3053\u308c\u3060\u3051\u3067\u6570\u3092\u51fa\u529b\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002COUNT\u95a2\u6570\u90e8\u5206\u306e\u307f\u6539\u3081\u3066\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u304b\u3002<\/p>\n<pre class=\"decode:true \" >COUNT( [\u6570\u3048\u305f\u3044\u8981\u7d20] )<\/pre>\n<p>COUNT\u95a2\u6570\u3067\u3001\u6570\u3048\u305f\u3044\u8981\u7d20\u3092\u56f2\u3080\u3060\u3051\u306a\u306e\u3067\u7c21\u5358\u3067\u3059\u306d!\u307e\u305f\u4eca\u56de\u306e\u3088\u3046\u306b\u30ec\u30b3\u30fc\u30c9\u6570(\u30c7\u30fc\u30bf\u6570)\u3092\u8abf\u3079\u305f\u3044\u3060\u3051\u306a\u3089\u3070*\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h2>[\u88dc\u8db3]NULL\u306e\u5834\u5408\u306f\u30ab\u30a6\u30f3\u30c8\u3055\u308c\u306a\u3044!?<\/h2>\n<p>\u4f8b\u3048\u3070\u3001user\u30c6\u30fc\u30d6\u30eb\u306bname\u3068\u3044\u3046\u540d\u524d\u8981\u7d20\u304c\u3042\u3063\u305f\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u305d\u306e\u8981\u7d20\u3092\u4f7f\u7528\u3057\u3066COUNT\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u30b3\u30de\u30f3\u30c9:<\/p>\n<pre class=\"decode:true \" >SELECT COUNT( name ) FROM user;<\/pre>\n<p>\u3057\u304b\u3057\u305d\u306e\u5834\u5408\u4e00\u3064\u6ce8\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\u3002name\u306bNULL\u304c\u5165\u3063\u3066\u3044\u305f\u5834\u5408\u3001\u305d\u308c\u306f\u30ab\u30a6\u30f3\u30c8\u306b\u306f\u542b\u307e\u308c\u306a\u3044\u306e\u3067\u3059\u3002\u4f8b\u3048\u3070user\u30c6\u30fc\u30d6\u30eb\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c7\u30fc\u30bf\u304c\u5165\u3063\u3066\u3044\u305f\u3068\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true \" >+------+--------------+\r\n| id   | name         |\r\n+------+--------------+\r\n|    1 | \u30e4\u30de\u30c0       |\r\n|    2 | \u30b9\u30ba\u30ad       |\r\n|    3 | \u30bf\u30ca\u30ab       |\r\n|    4 | \u30bf\u30ab\u30cf\u30b7     |\r\n|    5 | \u30ef\u30bf\u30ca\u30d9     |\r\n| NULL | NULL         |\r\n+------+--------------+<\/pre>\n<p>\u5b9f\u884c\u30b3\u30de\u30f3\u30c9:<\/p>\n<pre class=\"decode:true \" >SELECT COUNT( * ) FROM user;<\/pre>\n<p>* \u3067\u96c6\u8a08\u3092\u884c\u3063\u305f\u5834\u5408\u306f\u30016\u4ef6\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u30b3\u30de\u30f3\u30c9:<\/p>\n<pre class=\"decode:true \" >SELECT COUNT( name ) FROM user;<\/pre>\n<p>\u3057\u304b\u3057 name \u3067\u96c6\u8a08\u3092\u884c\u3063\u305f\u5834\u5408\u306f\u3001NULL\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u6570\u306b\u5165\u3089\u305a5\u4ef6\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u3053\u3068\u306fNULL\u3092\u542b\u307e\u306a\u3044\u96c6\u8a08\u3092\u884c\u3044\u305f\u3044\u6642\u306b\u5229\u7528\u3067\u304d\u307e\u3059\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u91cd\u8907\u3092\u56de\u907f\u3059\u308b\u306b\u306f?<\/h2>\n<p><b>\u91cd\u8907\u3092\u56de\u907f\u3057\u3066\u6570\u3092\u6570\u3048\u305f\u3044<\/b>\u3053\u3068\u3082\u3042\u308b\u3067\u3057\u3087\u3046\u3002\u305d\u306e\u5834\u5408\u306fDISTINCT\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u7c21\u5358\u306b\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>DISTINCT\u306f\u91cd\u8907\u30ec\u30b3\u30fc\u30c9\u30921\u3064\u306b\u307e\u3068\u3081\u3066\u304f\u308c\u308b\u4fbf\u5229\u306a\u547d\u4ee4\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u540d\u524d\u306e\u7a2e\u985e\u3060\u3051\u3092\u77e5\u308a\u305f\u3044\u306e\u306a\u3089\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"decode:true \" >SELECT COUNT(DISTINCT name ) FROM user;<\/pre>\n<p>\u91cd\u8907\u3092\u56de\u907f\u3059\u308b\u300cDISTINCT\u300d\u305c\u3072\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306bCOUNT\u3092\u4f7f\u304a\u3046!<\/h2>\n<p>GROUP BY\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u7a2e\u985e\u3054\u3068\u306e\u96c6\u8a08\u3092\u884c\u3046\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u5148\u307b\u3069\u306euser\u30c6\u30fc\u30d6\u30eb\u306e\u3001\u540d\u524d\u3054\u3068\u306e\u4eba\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3057\u305f\u3044\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"decode:true \" >SELECT name, COUNT( name ) FROM game_character GROUP BY name;<\/pre>\n<pre class=\"theme:dark-terminal lang:default decode:true \" >+--------------+----------------+\r\n| name         | count(name)    |\r\n+--------------+----------------+\r\n| NULL         |              0 |\r\n| \u30b9\u30ba\u30ad       |              1 |\r\n| \u30bf\u30ab\u30cf\u30b7     |              1 |\r\n| \u30bf\u30ca\u30ab       |              1 |\r\n| \u30e4\u30de\u30c0       |              1 |\r\n| \u30ef\u30bf\u30ca\u30d9     |              1 |\r\n+--------------+----------------+<\/pre>\n<p>\u7d50\u679c\u3068\u3057\u3066\u306f\u3001\u4e00\u4eba\u305a\u3064\u3057\u304b\u3044\u306a\u3044\u306e\u3067\u30011\u305a\u3064\u3067\u3059\u304c\u2026\u3061\u3083\u3093\u3068\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306b\u96c6\u8a08\u3067\u304d\u3066\u3044\u307e\u3059\u306d!<\/p>\n<p>\u203bNULL\u304c0\u306a\u306e\u306f\u5148\u307b\u3069\u306e\u8aac\u660e\u306e\u901a\u308a\u3001COUNT(name)\u3067\u306f\u3001NULL\u306f\u96c6\u8a08\u306e\u5bfe\u8c61\u5916\u3068\u306a\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<h2>\u4ed6\u306b\u3082\u3042\u308b!\u96c6\u8a08\u95a2\u6570\u305f\u3061!<\/h2>\n<p>\u3053\u3053\u3067\u4ed6\u306e\u96c6\u8a08\u95a2\u6570\u3092\u7c21\u5358\u306b\u898b\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\u8a18\u61b6\u3057\u3066\u304a\u3051\u3070\u3001\u3044\u3064\u304b\u5f79\u7acb\u3064\u65e5\u304c\u6765\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<h3>AVG\u3067\u5e73\u5747\u3092\u3068\u308d\u3046!<\/h3>\n<p>\u5e73\u5747\u5024\u3092\u53d6\u308b\u306a\u3089AVG\u95a2\u6570\u3067\u3059\u3002AVG\u95a2\u6570\u3067\u56f2\u3080\u3060\u3051\u306a\u306e\u3067\u7c21\u5358\u3067\u3059\u306d!<\/p>\n<pre class=\"decode:true \" >select AVG( [\u8981\u7d20] ) from [\u30c6\u30fc\u30d6\u30eb\u540d];<\/pre>\n<p>COUNT\u3068\u9055\u3063\u3066\u3001AVG( * )\u306a\u3069\u3068\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308b\u305f\u3081\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>* \u3060\u3068\u3001\u5e73\u5747\u306e\u51fa\u3057\u3088\u3046\u304c\u306a\u3044\u3067\u3059\u304b\u3089\u306d\u2026<\/p>\n<h3>SUM\u3067\u5408\u8a08\u3092\u3068\u308d\u3046!<\/h3>\n<p>\u5408\u8a08\u5024\u3092\u53d6\u308b\u306a\u3089SUM\u95a2\u6570\u3067\u3059\u3002\u3053\u3061\u3089\u3082\u8981\u7d20\u306f\u6570\u5b57\u3092\u5165\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"decode:true \" >select SUM( [\u8981\u7d20] ) from [\u30c6\u30fc\u30d6\u30eb\u540d];<\/pre>\n<h3>MAX\u3067\u6700\u5927\u3092\u3068\u308d\u3046!<\/h3>\n<p>\u6700\u5927\u5024\u306e\u307f\u3092\u53d6\u308b\u306a\u3089MAX\u95a2\u6570\u3067\u3059\u3002<\/p>\n<pre class=\"decode:true \" >select MAX( [\u8981\u7d20] ) from [\u30c6\u30fc\u30d6\u30eb\u540d];<\/pre>\n<h3>MIN\u3067\u6700\u5c0f\u3092\u3068\u308d\u3046!<\/h3>\n<p>\u6700\u5c0f\u5024\u306e\u307f\u3092\u53d6\u308b\u306a\u3089MIN\u95a2\u6570\u3067\u3059\u3002<\/p>\n<pre class=\"decode:true \" >select MIN( [\u8981\u7d20] ) from [\u30c6\u30fc\u30d6\u30eb\u540d];<\/pre>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4ee5\u4e0a\u3067COUNT\u95a2\u6570\u306e\u8aac\u660e\u3092\u7d42\u308f\u308a\u307e\u3059\u3002\u300c\u96c6\u8a08\u3092\u3059\u308b\u300d\u3068\u3044\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u95a2\u6570\u3086\u3048\u306b\u3001\u5229\u7528\u983b\u5ea6\u3082\u591a\u304f\u3044\u308d\u3044\u308d\u306a\u4f7f\u308f\u308c\u65b9\u3092\u3057\u307e\u3059\u306d!\u4eca\u56de\u5b66\u3093\u3060\u3053\u3068\u306e\u4e2d\u306b\u3001\u4eca\u5fc5\u8981\u3068\u3057\u3066\u3044\u308b\u77e5\u8b58\u304c\u542b\u307e\u308c\u3066\u3044\u305f\u306e\u306a\u3089\u5e78\u3044\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u4ed6\u306e\u6280\u8853\u3082\u3044\u3064\u304b\u5fc5\u8981\u306b\u306a\u3063\u305f\u6642\u306b\u306f\u3001\u3053\u306e\u30da\u30fc\u30b8\u3092\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u307f\u306a\u3055\u3093\u3053\u3093\u306b\u3061\u306f! \u4eca\u56de\u306fSQL\u306e\u4e2d\u3067\u3082\u3001\u591a\u7528\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3067\u3042\u308d\u3046\u57fa\u672c\u547d\u4ee4COUNT\u95a2\u6570\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002 COUNT\u306e\u4f7f\u3044\u65b9! \u91cd\u8907\u3092\u56de\u907f\u3059\u308b\u306b\u306f? \u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306bCOUNT\u3092\u4f7f\u304a\u3046! \u4ed6\u306b\u3082\u3042\u308b!\u96c6\u8a08\u95a2\u6570 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":72487,"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":[],"class_list":["post-72910","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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