{"id":765,"date":"2021-10-06T23:34:01","date_gmt":"2021-10-06T14:34:01","guid":{"rendered":"https:\/\/suzutukiblog.com\/?p=765"},"modified":"2022-01-19T01:13:42","modified_gmt":"2022-01-18T16:13:42","slug":"mysql9","status":"publish","type":"post","link":"https:\/\/suzutukiblog.com\/index.php\/2021\/10\/06\/mysql9\/","title":{"rendered":"MySQL9(count,group by,having)"},"content":{"rendered":"

\u305d\u306e8\u304b\u3089\u7d9a\u304d\u307e\u3059\u3002<\/a><\/p>\n

1:\u5bfe\u8c61\u884c\u306e\u884c\u6570\u3092\u6570\u3048\u308bcount\u96c6\u7d04\u95a2\u6570<\/h3>\n

\u4f8b\uff1aEC\u30b5\u30a4\u30c8(\u67b6\u7a7a)\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u4f55\u4eba\u3044\u308b\u304b\u8abf\u3079\u305f\u3044\uff01<\/h3>\n
select count(*) from users;<\/strong><\/pre>\n
\"\"<\/p>\n
\u203b\u30dd\u30a4\u30f3\u30c8<\/h3>\n
count(*)\u3068\u3059\u308b\u3068\u30c6\u30fc\u30d6\u30eb\u306e\u884c\u6570\u3092\u3059\u3079\u3066\u53d6\u5f97\u3067\u304d\u308b\u3002<\/p>\n
\u5973\u6027\u30e6\u30fc\u30b6\u30fc\u304c\u4f55\u4eba\u3044\u308b\u306e\u304b\u77e5\u308a\u305f\u3044\uff01<\/strong><\/p>\n
select count(*) from users where users.gender = 2;<\/strong><\/pre>\n
2:\u5fdc\u7528)2017\u5e741\u6708\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f \u30e6\u30cb\u30fc\u30af\u30e6\u30fc\u30b6\u30fc\u6570\uff08ec \u30b5\u30a4\u30c8\u767b\u9332\u30e6\u30fc\u30b6\u306e\u307f\uff09\u3092\u8abf\u3079\u305f\u3044\uff01<\/h3>\n
\u305d\u3082\u305d\u3082\u30e6\u30cb\u30fc\u30af\u30a2\u30af\u30bb\u30b9\u30e6\u30fc\u30b6\u30fc\u3068\u306f\uff1f(\u30d2\u30f3\u30c8)<\/p>\n
1:\u6c7a\u307e\u3063\u305f\u96c6\u8a08\u671f\u9593\u5185\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u30e6\u30fc\u30b6\u30fc\u306e\u6570\u3092\u8868\u3059\u6570\u5024<\/p>\n
2:\u3042\u308b\u30e6\u30fc\u30b6\u30fcA \u304c\u6c7a\u307e\u3063\u305f\u671f\u9593\u5185\u306b10\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3068\u3057\u3066\u30821\u3068\u6570\u3048\u308b\u3002<\/span>where\u53e5\u3068\u96c6\u7d04\u95a2\u6570 count (distinct expr)<\/span>\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u3046\u3002<\/span><\/p>\n
3:count (distinct expr)\u306e\u5f62\u3067\u3001count<\/span>\u95a2\u6570\u306f\u91cd\u8907\u3092\u6392\u9664\u3057\u305f\u5f62\u3067\u500b\u6570\u3092\u53d6\u5f97\u3067\u304d\u308b<\/span><\/p>\n
<\/p>\n
ER\u56f3<\/a>\u3092\u53c2\u8003\u306b\u307e\u305a2017\u5e741\u6708\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u30e6\u30fc\u30b6\u6570\u3092\u66f8\u3044\u3066\u307f\u308b<\/p>\n
select * from access_logs where request_month = '2017-01-01';<\/strong><\/pre>\n
\u6b21\u306b\u30e6\u30cb\u30fc\u30af\u30e6\u30fc\u30b6\u6570\u306e\u8a18\u8ff0\u3092\u3059\u308b<\/p>\n
\"\"<\/p>\n
select <\/strong>\r\n count(distinct user_id) <\/strong>\r\n from access_logs <\/strong>\r\n where request_month = '2017-01-01';<\/strong><\/pre>\n
\u30c7\u30fc\u30bf\u3092\u30b0\u30eb\u30fc\u30d7\u5316(group by\u53e5)<\/h3>\n
\u4f8b\uff1a\u90fd\u9053\u5e9c\u770c\u5225\u306e\u30e6\u30fc\u30b6\u30fc\u6570\u3092\u8abf\u3079\u305f\u3044\uff01<\/strong><\/p>\n
\"\"<\/p>\n
 select\r\n prefecture_id,count(*)\r\n from users\r\n group by prefecture_id;<\/strong><\/pre>\n
\u203b\u30dd\u30a4\u30f3\u30c8<\/h3>\n
group by<\/strong>\u3067\u6307\u5b9a\u3059\u308b\u5217\u540d(prefecture_id)<\/strong>\u3092\u30b0\u30eb\u30fc\u30d7\u5316<\/strong>\u3057\u305f\u3082\u306e\u3092count<\/strong>\u3067\u96c6\u8a08<\/strong>\u3057\u3066\u3042\u3052\u308b<\/p>\n
\u5fdc\u7528)2017\u5e74\u306e\u6708\u5225\u30e6\u30cb\u30fc\u30af\u30e6\u30fc\u30b6\u30fc\u6570\u3092\u77e5\u308a\u305f\u3044!<\/h3>\n
\u30d2\u30f3\u30c8\uff1aER\u56f3<\/a>\u3092\u53c2\u8003\u306b\u3057\u3066access_logs\u30c6\u30fc\u30d6\u30eb\u306erequest_month\u3092\u4f7f\u3046\"\"<\/p>\n
 select<\/strong>\r\n request_month,<\/strong>\r\n count(distinct user_id)<\/strong>\r\n from<\/strong>\r\n access_logs <\/strong>\r\n where <\/strong>\r\n request_month >='2017-01-01 00:00:00'<\/strong>\r\n and request_month <'2018-01-01 00:00:00'<\/strong>\r\n group by<\/strong>\r\n request_month;<\/strong><\/pre>\n
\u203b\u30dd\u30a4\u30f3\u30c8<\/h3>\n
where<\/strong>\u3067request_month<\/strong>\u306e\u671f\u9593\u3092\u6307\u5b9a\u3057group by<\/strong>\u3067request_month<\/strong>\u3092\u6708\u3054\u3068\u306b\u30b0\u30eb\u30fc\u30d7\u5316<\/strong>\u3059\u308b\u3002\u6700\u5f8c\u306bcount(distinct user_id)<\/strong>\u3067\u30e6\u30cb\u30fc\u30af\u30e6\u30fc\u30b6\u30fc<\/strong>\u3092\u8abf\u3079\u308b<\/p>\n
\u96c6\u7d04\u7d50\u679c\u3092\u3055\u3089\u306b\u7d5e\u308a\u8fbc\u3080(having\u53e5)<\/h3>\n
\"\"<\/p>\n
\u203b\u30dd\u30a4\u30f3\u30c8<\/h3>\n
having count(distinct user_id) >= 630;<\/p>\n
\u306b\u3088\u308a630\u4ee5\u4e0a\u306e\u6708\u306e\u307f\u306b\u7d5e\u308a\u8fbc\u3080<\/p>\n
\u4f8b1\uff1a\u30a2\u30af\u30bb\u30b9\u30ed\u30b0\u30922017\u5e741\u6708\u304b\u30892017\u5e746\u6708\u307e\u3067\u8abf\u3079\u305f\u3044\uff01<\/h3>\n
select * from access_logs where request_month >=’2017-01-01′
\nand request_month <‘2017-07-01’;<\/p>\n
\u4f8b2\uff1a\u6708\u3054\u3068(1\u6708\u304b\u30896\u6708\u307e\u3067)\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u6570\u3092\u8abf\u3079\u305f\u3044\uff01<\/h3>\n
 select\r\n<\/strong> request_month,\r\n<\/strong> count(*)\r\n<\/strong> from\r\n<\/strong> access_logs\r\n<\/strong> where\r\n<\/strong> request_month >='2017-01-01'\r\n<\/strong> and request_month <'2017-07-01'\r\n<\/strong> group by\r\n<\/strong> request_month;<\/strong><\/pre>\n
\"\"<\/p>\n
\u4f8b3\uff1a(1\u6708\u304b\u30896\u6708\u307e\u3067)\u306e\u30a2\u30af\u30bb\u30b9\u6570\u304c1,000\u4ee5\u4e0a\u306e\u6708\u3060\u3051\u629c\u304d\u51fa\u3057\u305f\u3044\uff01<\/h3>\n
select\r\n  request_month,\r\n  count(*) \r\nfrom\r\n  access_logs\r\nwhere \r\n  request_month >='2017-01-01'\r\n  and request_month <'2017-07-01' \r\ngroup by \r\n  request_month \r\n  having\r\n  count(*) >= 1000;<\/pre>\n
\u203b\u30dd\u30a4\u30f3\u30c8<\/h3>\n
\u30a2\u30af\u30bb\u30b9\u6570<\/strong>\u306a\u306e\u3067count(*)\u3067\u6570\u3048\u4e0a\u3052\u308b\u3002having\u53e5\u30671000\u4ee5\u4e0a\u306e\u307f\u8868\u793a<\/p>\n
\u305d\u306e\uff11\uff10\u306b\u7d9a\u304d\u307e\u3059\u3002<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u305d\u306e8\u304b\u3089\u7d9a\u304d\u307e\u3059\u3002 1:\u5bfe\u8c61\u884c\u306e\u884c\u6570\u3092\u6570\u3048\u308bcount\u96c6\u7d04\u95a2\u6570 \u4f8b\uff1aEC\u30b5\u30a4\u30c8(\u67b6\u7a7a)\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u4f55\u4eba\u3044\u308b\u304b\u8abf\u3079\u305f\u3044\uff01 select count(*) from users; \u203b\u30dd\u30a4\u30f3\u30c8 count(*)\u3068\u3059\u308b\u3068\u30c6\u30fc\u30d6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[5,27],"tags":[],"class_list":["post-765","post","type-post","status-publish","format-standard","hentry","category-mysql","category-programming-note"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/765","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/comments?post=765"}],"version-history":[{"count":21,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/765\/revisions"}],"predecessor-version":[{"id":4363,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/765\/revisions\/4363"}],"wp:attachment":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/media?parent=765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/categories?post=765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/tags?post=765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}