{"id":852,"date":"2021-10-11T20:29:49","date_gmt":"2021-10-11T11:29:49","guid":{"rendered":"https:\/\/suzutukiblog.com\/?p=852"},"modified":"2022-01-19T03:27:21","modified_gmt":"2022-01-18T18:27:21","slug":"mysql14","status":"publish","type":"post","link":"https:\/\/suzutukiblog.com\/index.php\/2021\/10\/11\/mysql14\/","title":{"rendered":"MySQL(\u305d\u306e14 \u30d3\u30e5\u30fc)"},"content":{"rendered":"

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

\u30c6\u30fc\u30d6\u30eb\u3068\u30d3\u30e5\u30fc\u306e\u9055\u3044\u306f?<\/h3>\n

\u30c6\u30fc\u30d6\u30eb<\/h3>\n

\u30fb\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58<\/p>\n

\u30d3\u30e5\u30fc<\/h3>\n

\u30fb\u30d3\u30e5\u30fc\u306e\u4e2d\u306b\u306f\u30bb\u30ec\u30af\u30c8\u6587\u304c\u4fdd\u5b58\u3055\u308c\u308b
\n\u30fb\u30d3\u30e5\u30fc\u81ea\u4f53\u306f\u30c7\u30fc\u30bf\u3092\u6301\u305f\u306a\u3044
\n\u30fborder by\u53e5\u304c\u4f7f\u3048\u306a\u3044=\u4e26\u3073\u66ff\u3048\u3067\u304d\u306a\u3044
\n\u30fb\u30d3\u30e5\u30fc\u306b\u5bfe\u3059\u308b\u66f4\u65b0\u306f\u4e0d\u53ef\u80fd\u3067\u306f\u306a\u3044\u304c\u5236\u9650\u304c\u3042\u308b\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3057\u306a\u3044\u306e\u3067\u8a18\u61b6\u88c5\u7f6e\u306e\u5bb9\u91cf\u3092\u7bc0\u7d04\u3067\u304d\u308b\u3002
\n\u30fb\u3088\u304f\u4f7f\u3046\u30bb\u30ec\u30af\u30c8\u6587\u3092\u30d3\u30e5\u30fc\u306b\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u4f7f\u3044\u56de\u3057\u304c\u3067\u304d\u308b\u304c
\n\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u3092\u62db\u304f\u5834\u5408\u304c\u3042\u308b<\/p>\n

\u4f8b\uff1a\u90fd\u9053\u5e9c\u770c\u5225\u306e\u30e6\u30fc\u30b6\u30fc\u6570\u3092\u77e5\u308a\u305f\u3044\uff01\u307e\u305a\u306fselect\u6587\u304b\u3089<\/h3>\n
select<\/strong>\r\np.name,<\/strong>\r\ncount(*)<\/strong>\r\nfrom<\/strong>\r\nusers as u<\/strong>\r\ninner join<\/strong>\r\nprefectures as p<\/strong>\r\non u.prefecture_id = p.id<\/strong>\r\ngroup by<\/strong>\r\nprefecture_id;<\/strong><\/pre>\n
\"\"<\/p>\n
\u3053\u308c\u3092view\u306b\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002<\/p>\n
<\/p>\n
create view prefecture_user_counts(name,count) as\u3092\u3055\u3063\u304d\u306e\u306b\u8db3\u3059\u3060\u3051<\/p>\n
create view prefecture_user_counts(name,count)<\/strong>\r\nas<\/strong>\r\n<\/span>select<\/strong>\r\np.name,<\/strong>\r\ncount(*)<\/strong>\r\nfrom<\/strong>\r\nusers as u<\/strong>\r\ninner join<\/strong>\r\nprefectures as p<\/strong>\r\non u.prefecture_id = p.id<\/strong>\r\ngroup by<\/strong>\r\nprefecture_id;<\/strong><\/pre>\n
\u30af\u30a8\u30ea\u3092\u5b9f\u884c(\u7a32\u59bb\u306e\u30a2\u30a4\u30b3\u30f3\u3092\u30af\u30ea\u30c3\u30af)\u3057\u3066\u304b\u3089<\/p>\n
\u5de6\u306eViews<\/strong>\u3092\u53f3\u30af\u30ea\u30c3\u30af\u3057\u3066Refresh All<\/strong>\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\"\"<\/p>\n
\u30d3\u30e5\u30fc\u306e\u4f7f\u3044\u65b9
\nselect<\/strong>
\nname,<\/strong>
\ncount<\/strong>
\nfrom<\/strong>
\nprefecture_user_counts;<\/strong>
\n\u2191\u5148\u7a0b\u4f5c\u3063\u305f\u30d3\u30e5\u30fc<\/p>\n
\"\"<\/p>\n
\u30d3\u30e5\u30fc\u306e\u5236\u9650\u4e8b\u9805<\/h3>\n
order by\u53e5\u304c\u4f7f\u3048\u306a\u3044<\/strong><\/p>\n
\u30d3\u30e5\u30fc\u306e\u524a\u9664<\/h3>\n
drop view prefecture_user_counts;<\/strong><\/p>\n
\u4f7f\u3063\u3066\u307f\u308b\u3068
\nselect<\/strong>
\nname,<\/strong>
\ncount<\/strong>
\nfrom<\/strong>
\nprefecture_user_counts;<\/strong><\/p>\n
Error Code: 1146<\/strong>. Table ‘mydb.prefecture_user_counts’ doesn’t exist
\n\u2191\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u304c\u51fa\u308b<\/p>\n
\u305d\u306e15\u306b\u7d9a\u304d\u307e\u3059\u3002<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
13\u304b\u3089\u7d9a\u304d\u307e\u3059\u3002 \u30c6\u30fc\u30d6\u30eb\u3068\u30d3\u30e5\u30fc\u306e\u9055\u3044\u306f? \u30c6\u30fc\u30d6\u30eb \u30fb\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58 \u30d3\u30e5\u30fc \u30fb\u30d3\u30e5\u30fc\u306e\u4e2d\u306b\u306f\u30bb\u30ec\u30af\u30c8\u6587\u304c\u4fdd\u5b58\u3055\u308c\u308b \u30fb\u30d3\u30e5\u30fc\u81ea\u4f53\u306f\u30c7\u30fc\u30bf\u3092\u6301\u305f\u306a\u3044 \u30fborder by\u53e5\u304c\u4f7f\u3048\u306a\u3044=\u4e26\u3073\u66ff\u3048\u3067\u304d\u306a\u3044 \u30fb\u30d3\u30e5\u30fc\u306b […]<\/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-852","post","type-post","status-publish","format-standard","hentry","category-mysql","category-programming-note"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t