{"id":904,"date":"2021-04-25T16:26:55","date_gmt":"2021-04-25T08:26:55","guid":{"rendered":"http:\/\/refusea.com\/?p=904"},"modified":"2021-05-08T14:53:55","modified_gmt":"2021-05-08T06:53:55","slug":"mysql-%e5%85%b3%e8%81%94%e8%a1%a8%e6%9b%b4%e6%96%b0-join-update","status":"publish","type":"post","link":"https:\/\/refusea.com\/?p=904","title":{"rendered":"mysql \u5173\u8054\u8868\u66f4\u65b0 join-update"},"content":{"rendered":"<h2>\u80cc\u666f<\/h2>\n<p>\u6700\u8fd1\u505a instagram \u722c\u866b\uff0c\u6d89\u53ca\u5230\u5173\u8054\u8868\u7684\u66f4\u65b0\uff0c\u8bb0\u5f55\u4e0b\u6765<\/p>\n<p>instagram \u7684\u5e16\u5b50\uff0c\u53ef\u4ee5\u662f\u5355\u4e2a\u56fe\u7247\u6216\u89c6\u9891\uff0c\u4e5f\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u56fe\u7247\/\u89c6\u9891\uff0c\u6211\u628a\u5e16\u5b50\u62bd\u8c61\u4e3a <code>album<\/code>\uff0c\u5e16\u5b50\u91cc\u7684\u56fe\u7247\u6216\u89c6\u9891\u62bd\u8c61\u4e3a <code>media<\/code>\uff0c\u5373\u4e00\u4e2a <code>album<\/code> \u5305\u542b n \u4e2a <code>media<\/code><\/p>\n<p>\u8981\u722c\u53d6 instagram \u91cc\u6536\u85cf\u7684\u56fe\u7247\u6216\u89c6\u9891\uff0c\u7b2c\u4e00\u6b65\u662f\u8bbf\u95ee\u6536\u85cf\u5939\uff0c\u8fd4\u56de\u4e00\u4e2a <code>album<\/code> \u5217\u8868\uff0c\u7136\u540e\u904d\u5386\u8be5 <code>album<\/code> \u5217\u8868\uff0c\u83b7\u5f97\u6bcf\u4e2a <code>album<\/code> \u91cc\u7684 <code>media<\/code> \u4fe1\u606f<\/p>\n<p>\u5728\u83b7\u5f97 <code>album<\/code> \u5217\u8868\u540e\uff0c\u6211\u4f1a\u5c06\u5176\u4fdd\u5b58\u5230 <code>instagram_album<\/code> \u8868\uff0c\u83b7\u5f97\u6bcf\u4e2a <code>album<\/code> \u91cc\u7684 <code>media<\/code> \u540e\uff0c\u4fdd\u5b58\u5230 <code>instagram_media<\/code> \u8868<\/p>\n<p>\u5982\u679c\u4e00\u4e2a <code>album<\/code> \u7684 <code>media<\/code> \u4fe1\u606f\u5df2\u7ecf\u4fdd\u5b58\u5230\u6570\u636e\u5e93\uff0c\u6211\u4f1a\u66f4\u65b0 <code>instagram_album<\/code> \u8868\u7684\u72b6\u6001\u5b57\u6bb5 <code>media_status=Y<\/code>\uff0c\u8868\u793a\u5176 <code>media<\/code> \u5df2\u7ecf\u83b7\u53d6\uff0c\u4e0b\u6b21\u722c\u53d6\u65f6\u4f1a\u7565\u8fc7\u8fd9\u4e9b <code>album<\/code><\/p>\n<p>\u540e\u7eed\u6211\u4f18\u5316\u4e86 <code>instagram_album<\/code> \u8868\uff0c\u7528 <code>media_count<\/code> \u8bb0\u5f55\u8be5 <code>album<\/code> \u5305\u542b\u51e0\u4e2a <code>media<\/code>\uff0c\u521d\u59cb\u65f6 <code>media_count=0<\/code>\uff0c\u83b7\u53d6\u5230 <code>media<\/code> \u4fe1\u606f\u5e76\u4fdd\u5b58\u540e\uff0c\u66f4\u65b0\u8be5\u5b57\u6bb5\uff0c\u8fd9\u6837\u53ea\u8981 <code>media_count&gt;0<\/code>\uff0c\u5176\u542b\u4e49\u548c <code>media_status=Y<\/code> \u5c31\u662f\u4e00\u6837\u7684\uff0c<code>media_status<\/code> \u5b57\u6bb5\u5c31\u6ca1\u6709\u5fc5\u8981\u4e86<\/p>\n<p>\u6b64\u65f6\uff0c\u6211\u5df2\u7ecf\u722c\u53d6\u4e86\u5927\u91cf <code>album<\/code> \u7684 <code>media<\/code> \u4fe1\u606f\uff0c\u65b0\u589e\u52a0\u7684 <code>media_count<\/code> \u5b57\u6bb5\u521d\u59cb\u503c\u662f 0\uff0c\u6240\u4ee5\u6211\u9700\u8981\u6839\u636e <code>instagram_media<\/code> \u7684\u6570\u636e\u6765\u66f4\u65b0 <code>media_count<\/code> \u5b57\u6bb5<\/p>\n<h2>\u5173\u8054\u66f4\u65b0<\/h2>\n<p>\u5148\u7edf\u8ba1\u4e0b <code>instagram_media<\/code> \u91cc\u5404 <code>album<\/code> \u542b\u6709\u591a\u5c11 <code>media<\/code>\uff0c\u5982\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; SELECT album_shortcode, COUNT(1) FROM instagram_media\n    -&gt;  GROUP BY album_shortcode limit 20;\n+----------------+----------+\n| album_shortcode | COUNT(1) |\n+----------------+----------+\n| _MbLf8iL7k     |        1 |\n| B_0CFQrDnRD    |        1 |\n| B_0CwGjIxhq    |        1 |\n| B_0DvOeJa0c    |        1 |\n| B_0K6MOnEvp    |        1 |\n| B_0KBcWhm76    |        1 |\n| B_0PV7Rn6XG    |        1 |\n| B_0SqJiJyU-    |        1 |\n| B_2f9E9hN5H    |        1 |\n| B_2o8wwIqa-    |        1 |\n| B_2qLAFn9T_    |        1 |\n| B_2zqPeno2t    |        2 |\n| B_5XcuEoIUx    |        1 |\n| B_7-qYtIcj5    |        1 |\n| B_7rwQCFwos    |        1 |\n| B_A-Vz1H9RV    |        1 |\n| B_AfdkgHx4h    |        1 |\n| B_AgITYpUbn    |        1 |\n| B_aHSkHj5Al    |        1 |\n| B_aK31DnslP    |        1 |\n+----------------+----------+\n20 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u53ea\u8981\u628a <code>COUNT(1)<\/code> \u5b57\u6bb5\u66f4\u65b0\u5230 <code>instagram_album<\/code> \u5373\u53ef\uff0c\u5982\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; SELECT shortcode, media_count\n    -&gt;  FROM instagram_album LIMIT 20;\n+-------------+-------------+\n| shortcode   | media_count |\n+-------------+-------------+\n| CN5n7Qtjs_k |          10 |\n| CN5XuBJpDEr |           1 |\n| CN5RQa3nDKB |           3 |\n| CN4sKYeDB_d |           5 |\n| CN3BkGmsiS4 |           1 |\n| CN2soSsLRGq |           1 |\n| CN5AfW4FJbR |           1 |\n| CN2tVtgDCr7 |           1 |\n| CN0MXblBmSH |           1 |\n| CN2z7MgHvYk |           1 |\n| CN4veaepbIM |           1 |\n| CN5IAN4Anz1 |           1 |\n| CN0dPRjhvKb |          10 |\n| CNvBtQOBk2- |           1 |\n| CN0wL8FB_lc |           2 |\n| CN0AURjpo5b |           2 |\n| CN0TsrZH3Dx |           1 |\n| CN0NbOMJZpF |           1 |\n| CN0PmfvLqBT |           1 |\n| CNz-dYGLYWE |           1 |\n+-------------+-------------+\n20 rows in set (0.00 sec)<\/code><\/pre>\n<h2>\u5173\u8054\u66f4\u65b0<\/h2>\n<pre><code class=\"language-sql\">UPDATE instagram_album INNER JOIN \n(SELECT album_shortcode, COUNT(1) AS c FROM instagram_media GROUP BY album_shortcode) v \nON instagram_album.shortcode=v.album_shortcode \nSET instagram_album.media_count=v.c \nWHERE instagram_album.shortcode=v.album_shortcode<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u80cc\u666f \u6700\u8fd1\u505a instagram \u722c\u866b\uff0c\u6d89\u53ca\u5230\u5173\u8054\u8868\u7684\u66f4\u65b0\uff0c\u8bb0\u5f55\u4e0b\u6765 instagram \u7684\u5e16\u5b50\uff0c\u53ef\u4ee5\u662f\u5355\u4e2a\u56fe 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