{"id":11465,"date":"2023-04-21T16:34:44","date_gmt":"2023-04-21T08:34:44","guid":{"rendered":"https:\/\/www.gbase8.cn\/?p=11465"},"modified":"2023-05-05T09:26:58","modified_gmt":"2023-05-05T01:26:58","slug":"gbase-8a%e6%97%a5%e6%9c%9f%e6%88%aa%e6%96%ad%e5%87%bd%e6%95%b0date_trunc%e4%bd%bf%e7%94%a8%e6%a0%b7%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/11465","title":{"rendered":"\u5357\u5927\u901a\u7528GBase 8a\u65e5\u671f\u622a\u65ad\u51fd\u6570date_trunc\u4f7f\u7528\u6837\u4f8b"},"content":{"rendered":"<p>GBase 8a\u901a\u8fc7date_trunc\u51fd\u6570\uff0c\u5c06\u65e5\u671f\u6307\u5b9a\u7cbe\u5ea6\u4f4d\u7f6e\u4ee5\u540e\u7684\u90e8\u5206\u622a\u65ad\u3002\u672c\u6587\u4ecb\u7ecd\u8be5\u51fd\u6570\u5404\u79cd\u53c2\u6570\u7684\u4f7f\u7528\u6837\u4f8b\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Directory Navigation<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a2b0d3b748df\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a2b0d3b748df\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#%E5%8F%82%E8%80%83\" >\u53c2\u8003<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#%E8%AF%AD%E6%B3%95\" >\u8bed\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#year\" >year<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#quarter\" >quarter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#month\" >month<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#week\" >week<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#day\" >day<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#hour\" >hour<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#minute\" >minute<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#second\" >second<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#century\" >century<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#decade\" >decade<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#millennium\" >millennium<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#milliseconds\" >milliseconds<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.gbase8.cn\/en\/11465\/#microseconds\" >microseconds<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%82%E8%80%83\"><\/span>\u53c2\u8003<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.gbase8.cn\/en\/11604\/\">GBase 8a\u65e5\u671f\u51fd\u6570date_part\u548cextract\u7684\u4ecb\u7ecd\u548c\u4f7f\u7528\u6837\u4f8b<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AF%AD%E6%B3%95\"><\/span>\u8bed\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>date_trunc(type,date)<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>type \u622a\u65ad\u7684\u7cbe\u5ea6\u4f4d\u7f6e\u3002\u4f4e\u4e8e\u8be5\u7cbe\u5ea6\u7684\u622a\u65ad\u3002<\/li><li>date \u65e5\u671f\uff0c\u4e00\u822c\u662fdatetime\u7c7b\u578b\u3002\u5982\u679c\u662fdate\u7c7b\u578b\u4f1a\u81ea\u52a8\u8f6c\u6210datetime<\/li><\/ul>\n\n\n\n<p>\u5176\u4e2dtype\u7c7b\u578b\uff0c\u652f\u6301\u4e0d\u5e26\u5f15\u53f7\u548c\u5e26\u5f15\u53f7\u4e24\u79cd\u5199\u6cd5\uff0c\u6bd4\u5982  year\u548c'year'\u90fd\u652f\u6301\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Type\u7c7b\u578b<\/th><th>\u8bf4\u660e<\/th><th>date_part\/extract<\/th><th>date_trunc<\/th><\/tr><\/thead><tbody><tr><td>year<\/td><td>\u5e74<\/td><td>\u65e5\u671f\u4e2d\u7684\u5e74\u7684\u90e8\u5206\u3002\u8bf7\u6ce8\u610f\u533a\u5206isoyear\u3002<\/td><td>\u5e74\u4ee5\u4e0b\u7684\u8bbe\u7f6e\u4e3a01-01 00:00:00<\/td><\/tr><tr><td>year_month<\/td><td>\u5e74\u6708<\/td><td>\u8fd4\u56de\u5e74\u548c\u6708<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>quarter<\/td><td>\u5b63\u5ea6<\/td><td>\u8fd4\u56de\u5c5e\u4e8e\u7b2c\u51e0\u4e2a\u5b63\u5ea6\u3002<br>1\uff1a01-01 - 03-31<br>2\uff1a04-01 - 06-30<br>3\uff1a07-01 - 09-30<br>4\uff1a10-01 - 12-31<\/td><td>\u65e5\u671f\u6240\u5728\u5b63\u5ea6\u7684\u7b2c\u4e00\u5929\uff0c\u65f6\u95f4\u90e8\u5206\u4e3a00:00:00<\/td><\/tr><tr><td>month<\/td><td>\u6708<\/td><td>\u65e5\u671f\u4e2d\u7684\u6708\u4efd<\/td><td>\u65e5\u671f\u6240\u5728\u6708\u7684\u7b2c\u4e00\u5929\uff0c\u65f6\u95f4\u90e8\u5206\u4e3a00:00:00<\/td><\/tr><tr><td>week<\/td><td>\u5468<\/td><td>\u65e5\u671f\u6240\u5728\u5f53\u5e74\u7684\u7b2c\u51e0\u5468<\/td><td>\u65e5\u671f\u6240\u5728\u5468\u7684\u5468\u4e00\uff0c\u65f6\u95f4\u90e8\u5206\u4e3a00:00:00<\/td><\/tr><tr><td>day<\/td><td>\u65e5<\/td><td>\u65e5\u671f\u4e2d\u7684\u65e5<\/td><td>\u65e5\u671f\u7684\u65f6\u95f4\u90e8\u5206\u8bbe\u7f6e\u4e3a00:00:00<\/td><\/tr><tr><td>day_hour<\/td><td>\u65e5\uff0c\u5c0f\u65f6<\/td><td>\u65e5\u671f\u4e2d\u7684\u65e5\u548c\u5c0f\u65f6<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>day_minute<\/td><td>\u65e5\u3001\u5c0f\u65f6\u3001\u5206<\/td><td>\u65e5\u671f\u4e2d\u7684\u65e5\u3001\u5c0f\u65f6\u548c\u5206<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>day_second<\/td><td>\u65e5\u3001\u5c0f\u65f6\u3001\u5206\u3001\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u65e5\u3001\u5c0f\u65f6\u3001\u5206\u548c\u79d2<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>hour<\/td><td>\u5c0f\u65f6<\/td><td>\u65e5\u671f\u4e2d\u7684\u5c0f\u65f6\u90e8\u5206<\/td><td>\u5c0f\u65f6\u4ee5\u4e0b\u8bbe\u7f6e\u4e3a00:00<\/td><\/tr><tr><td>hour_minute<\/td><td>\u5c0f\u65f6\u3001\u5206\u949f<\/td><td>\u65e5\u671f\u4e2d\u7684\u5c0f\u65f6\u3001\u5206\u949f\u90e8\u5206<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>hour_second<\/td><td>\u5c0f\u65f6\u3001\u5206\u3001\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u5c0f\u65f6\u3001\u5206\u79cd\u3001\u8868\u90e8\u5206<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>minute<\/td><td>\u5206\u949f<\/td><td>\u65e5\u671f\u4e2d\u7684\u5206\u949f\u90e8\u5206<\/td><td>\u5206\u949f\u4ee5\u4e0b\u7684\u8bbe\u7f6e\u4e3a0<\/td><\/tr><tr><td>minute_second<\/td><td>\u5206\u949f\u3001\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u5206\u3001\u79d2\u90e8\u5206<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>second<\/td><td>\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u79d2<\/td><td>\u79d2\u4ee5\u4e0b\u8bbe\u7f6e\u4e3a0<\/td><\/tr><tr><td>millisecond<\/td><td>\u6beb\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u6beb\u79d2\u90e8\u5206<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>microsecond<\/td><td>\u5fae\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u5fae\u79d2\u90e8\u5206<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>day_microsecond<\/td><td>\u5929\u3001\u5c0f\u65f6\u3001\u5206\u3001\u79d2\u3001\u5fae\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u5929\u3001\u5c0f\u65f6\u3001\u5206\u3001\u79d2\u3001\u5fae\u79d2\u90e8\u5206\u3002<br>\u6ce8\u610f\u683c\u5f0f\u4e3addhhmmssXXXXXX<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>hour_microsecond<\/td><td>\u5c0f\u65f6\u3001\u5206\u3001\u79d2\u3001\u5fae\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u5c0f\u65f6\u3001\u5206\u3001\u79d2\u3001\u5fae\u79d2\u90e8\u5206\u3002<br>\u6ce8\u610f\u683c\u5f0f\u4e3ahhmmssXXXXXX<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>minute_microsecond<\/td><td>\u5206\u3001\u79d2\u3001\u5fae\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u5206\u3001\u79d2\u3001\u5fae\u79d2\u90e8\u5206\u3002<br>\u6ce8\u610f\u683c\u5f0f\u4e3ammssXXXXXX<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>second_microsecond<\/td><td>\u79d2\u3001\u5fae\u79d2<\/td><td>\u65e5\u671f\u4e2d\u7684\u79d2\u3001\u5fae\u79d2\u90e8\u5206\u3002<br>\u6ce8\u610f\u683c\u5f0f\u4e3assXXXXXX<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>Century<\/td><td>\u4e16\u7eaa<\/td><td>\u8be5\u65e5\u671f\u6240\u5728\u7684\u4e16\u7eaa\u3002\u4ee5\u767e\u5e74\u4e3a\u5355\u4f4d\uff0c\u6574\u767e\u5e74\u4e3a\u4e0a\u4e00\u4e16\u7eaa\u3002<br>0001-0100 \u7b2c1\u4e16\u7eaa<br>0101-2000 \u7b2c2\u4e16\u7eaa<br>...<br>2021-2100 \u7b2c21\u4e16\u7eaa<\/td><td>\u8be5\u65e5\u671f\u6240\u5728\u4e16\u7eaa\u7684\u7b2c\u4e00\u5929<\/td><\/tr><tr><td>decade<\/td><td>\u5341\u5e74<\/td><td>\u5e74\u4efd\u768410\u53d6\u6574\u3002\u6bd4\u59822023\u5e74\u7b97202\u4e2a10\u5e74\u3002<\/td><td>\u65e5\u671f\u6240\u572810\u5e74\u7684\u7b2c\u4e00\u5929\u3002\u65f6\u95f4\u4e3a0<\/td><\/tr><tr><td>dow<\/td><td>\u5468\u7684\u7b2c\u51e0\u59290-6<\/td><td>\u65e5\u671f\u662f\u6240\u5728\u5468\u7684\u7b2c\u51e0\u5929\u3002\u5468\u65e5\u4e3a0\uff0c\u5468\u4e00\u4e3a1\uff0c\u5468\u516d\u4e3a6<br>\u6ce8\u610f\u548cisodow\u7684\u533a\u522b<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>doy<\/td><td>\u5e74\u7684\u7b2c\u51e0\u5929<\/td><td>\u65e5\u671f\u662f\u5f53\u524d\u7684\u7b2c\u51e0\u5929<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>epoch<\/td><td>\u5e26\u5fae\u79d2\u7684\u65f6\u95f4\u6233<\/td><td>extract\u652f\u6301\uff0c\u4e0eunix_timestamp\u7c7b\u4f3c\uff0c\u591a\u4e86\u5fae\u79d2\u90e8\u5206(\u5982\u679c\u6709\u7684\u8bdd)<br>1682046733.56789<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>isodow<\/td><td>\u5468\u7684\u7b2c\u51e0\u59291-7<\/td><td>\u65e5\u671f\u662f\u6240\u5728\u5468\u7684\u7b2c\u51e0\u5929\u3002\u5468\u4e00\u4e3a1\uff0c\u5468\u516d\u4e3a6,\u5468\u65e5\u4e3a7<br>\u6ce8\u610f\u548cdow\u7684\u533a\u522b<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>isoyear<\/td><td>\u65e5\u671f\u843d\u5728iso8601\u5468\u7f16\u53f7\u7684\u5e74<\/td><td>\u6309\u7167iso8601\u7f16\u53f7\uff0c\u6bcf\u5e74\u7b2c\u4e00\u4e2a\u5468\u56db\u6240\u5728\u7684\u5468\u4f5c\u4e3a\u8be5\u5e74\u7684\u7b2c\u4e00\u5468\u3002\u4e70\u5e74\u6700\u540e\u4e00\u4e2a\u5468\u56db\u6240\u5728\u7684\u5468\u4f5c\u4e3a\u8be5\u5e74\u7684\u6700\u540e\u4e00\u5468\u3002\u6240\u4ee5\u5e74\u521d\uff0c\u5e74\u672b\u7684\u65e5\u671f\uff0c\u53ef\u80fd\u662f\u4e0a\u4e00\u5e74\u6216\u8005\u4e0b\u4e00\u5e74\u7684\u3002<br>\u6ce8\u610f\u548cyear\u7684\u533a\u522b\u3002<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>millennium<\/td><td>\u5343\u5e74<\/td><td>\u5f53\u524d\u5e74\u4efd\u662f\u7b2c\u51e0\u4e2a\u5343\u5e74<br>0001-1000 \u4e3a\u7b2c1\u4e2a\u5343\u5e74<br>1001-2000 \u4e3a\u7b2c2\u4e2a\u5343\u5e74<br>2001-3000 \u4e3a\u7b2c3\u4e2a\u5343\u5e74 ...<\/td><td>\u6240\u5728\u5343\u5e74\u7b2c\u4e00\u65e5\uff0c\u65f6\u95f4\u4e3a00:00:00<\/td><\/tr><tr><td>milliseconds<\/td><td>\u79d2\uff0c\u6beb\u79d2<\/td><td>\u8fd4\u56de\u65f6\u95f4\u4e2d\u7684\u79d2\u548c\u6beb\u79d2\u90e8\u5206<\/td><td>\u6beb\u79d2\u4ee5\u4e0b\u8bbe\u7f6e\u4e3a0<\/td><\/tr><tr><td>microseconds<\/td><td>\u79d2\uff0c\u5fae\u79d2<br>\u7b49\u540c\u4e8esecond_microsecond<\/td><td>\u8fd4\u56de\u79d2\uff0c\u5fae\u79d2\u90e8\u5206\u3002<br>\u6ce8\u610f\u683c\u5f0f\u4e3assXXXXXX<\/td><td>\u5fae\u79d2\u4ee5\u4e0b\u8bbe\u7f6e\u4e3a0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"year\"><\/span>year<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5e74\u7684\u7b2c\u4e00\u5929\uff0c\u5e74\u5df2\u4e0b\u4e3a 01-01 00:00:00<\/p>\n\n\n\n<p>\u53c2\u6570\u662f\u5426\u6709\u53cc\u5f15\u53f7\u5747\u53ef\uff0c\u540e\u9762\u7684\u4f8b\u5b50\u4e0d\u518d\u91cd\u590d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(year,'2023-04-21 11:12:13.56789');\n+----------------------------------------------+\n| date_trunc(year,'2023-04-21 11:12:13.56789') |\n+----------------------------------------------+\n| 2023-01-01 00:00:00                          |\n+----------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n\ngbase&gt; select date_trunc('year','2023-04-21 11:12:13.56789');\n+------------------------------------------------+\n| date_trunc('year','2023-04-21 11:12:13.56789') |\n+------------------------------------------------+\n| 2023-01-01 00:00:00                            |\n+------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"quarter\"><\/span>quarter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u65e5\u671f\u6240\u5728\u5b63\u5ea6\u7684\u7b2c\u4e00\u5929\uff0c\u65f6\u95f4\u90e8\u5206\u4e3a00:00:00<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(quarter,'2023-04-21 11:12:13.56789');\n+-------------------------------------------------+\n| date_trunc(quarter,'2023-04-21 11:12:13.56789') |\n+-------------------------------------------------+\n| 2023-04-01 00:00:00                             |\n+-------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"month\"><\/span>month<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u65e5\u671f\u6240\u5728\u6708\u7684\u7b2c\u4e00\u5929\uff0c\u65f6\u95f4\u90e8\u5206\u4e3a00:00:00<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select date_trunc(month,'2023-04-21 11:12:13.56789');\n+-----------------------------------------------+\n| date_trunc(month,'2023-04-21 11:12:13.56789') |\n+-----------------------------------------------+\n| 2023-04-01 00:00:00                           |\n+-----------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"week\"><\/span>week<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u65e5\u671f\u6240\u5728\u5468\u7684\u5468\u4e00\uff0c\u65f6\u95f4\u90e8\u5206\u4e3a00:00:00\u3002 \u6bcf\u5e74\u7684\u7b2c\u4e00\u5468\u6240\u5728\u5468\u4e00\u53ef\u80fd\u5728\u4e0a\u4e00\u5e74\u5ea6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select date_trunc(week,'2023-04-21 11:12:13.56789');\n+----------------------------------------------+\n| date_trunc(week,'2023-04-21 11:12:13.56789') |\n+----------------------------------------------+\n| 2023-04-17 00:00:00                          |\n+----------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n\ngbase&gt; select date_trunc(week,'2023-01-1 11:12:13.56789');\n+---------------------------------------------+\n| date_trunc(week,'2023-01-1 11:12:13.56789') |\n+---------------------------------------------+\n| 2022-12-26 00:00:00                         |\n+---------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"day\"><\/span>day<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u65e5\u671f\u7684\u65f6\u95f4\u90e8\u5206\u8bbe\u7f6e\u4e3a00:00:00<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(day,'2023-04-21 11:12:13.56789');\n+---------------------------------------------+\n| date_trunc(day,'2023-04-21 11:12:13.56789') |\n+---------------------------------------------+\n| 2023-04-21 00:00:00                         |\n+---------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"hour\"><\/span>hour<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5c0f\u65f6\u4ee5\u4e0b\u8bbe\u7f6e\u4e3a00:00<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(hour,'2023-04-21 11:12:13.56789');\n+----------------------------------------------+\n| date_trunc(hour,'2023-04-21 11:12:13.56789') |\n+----------------------------------------------+\n| 2023-04-21 11:00:00                          |\n+----------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"minute\"><\/span>minute<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5206\u949f\u4ee5\u4e0b\u8bbe\u7f6e\u4e3a00<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(minute,'2023-04-21 11:12:13.56789');\n+------------------------------------------------+\n| date_trunc(minute,'2023-04-21 11:12:13.56789') |\n+------------------------------------------------+\n| 2023-04-21 11:12:00                            |\n+------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n\ngbase&gt;\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"second\"><\/span>second<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u79d2\u4ee5\u4e0b\u7684\u8bbe\u7f6e\u4e3a0<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(second,'2023-04-21 11:12:13.56789');\n+------------------------------------------------+\n| date_trunc(second,'2023-04-21 11:12:13.56789') |\n+------------------------------------------------+\n| 2023-04-21 11:12:13                            |\n+------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"century\"><\/span>century<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8be5\u65e5\u671f\u6240\u5728\u4e16\u7eaa\u7684\u7b2c\u4e00\u5929<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select date_trunc(century,'2023-04-21 11:12:13.56789');\n+-------------------------------------------------+\n| date_trunc(century,'2023-04-21 11:12:13.56789') |\n+-------------------------------------------------+\n| 2001-01-01 00:00:00                             |\n+-------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"decade\"><\/span>decade<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u65e5\u671f\u6240\u572810\u5e74\u7684\u7b2c\u4e00\u5929\uff0c\u65f6\u95f4\u4e3a0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select date_trunc(decade,'2023-04-21 11:12:13.56789');\n+------------------------------------------------+\n| date_trunc(decade,'2023-04-21 11:12:13.56789') |\n+------------------------------------------------+\n| 2020-01-01 00:00:00                            |\n+------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"millennium\"><\/span>millennium<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u65e5\u671f\u6240\u5728\u5343\u5e74\u7684\u7b2c\u4e00\u5929<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(millennium,'2023-04-23 11:12:13.56789');\n+----------------------------------------------------+\n| date_trunc(millennium,'2023-04-23 11:12:13.56789') |\n+----------------------------------------------------+\n| 2001-01-01 00:00:00                                |\n+----------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"milliseconds\"><\/span>milliseconds<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5c06\u65e5\u671f\u7684\u6beb\u79d2\u4ee5\u4e0b\u8bbe\u7f6e\u4e3a0<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(milliseconds,'2023-04-23 11:12:13.56789');\n+------------------------------------------------------+\n| date_trunc(milliseconds,'2023-04-23 11:12:13.56789') |\n+------------------------------------------------------+\n| 2023-04-23 11:12:13.567000                           |\n+------------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"microseconds\"><\/span>microseconds<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5fae\u79d2\uff0c\u7b49\u540c\u4e8esecond_mircrosecond<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; select date_trunc(microseconds,'2023-04-23 11:12:13.56789');\n+------------------------------------------------------+\n| date_trunc(microseconds,'2023-04-23 11:12:13.56789') |\n+------------------------------------------------------+\n| 2023-04-23 11:12:13.567890                           |\n+------------------------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>","protected":false},"excerpt":{"rendered":"<p>\u5357\u5927\u901a\u7528GBase 8a\u901a\u8fc7date_trunc\u51fd\u6570\uff0c\u5c06\u65e5\u671f\u6307\u5b9a\u7cbe\u5ea6\u4f4d\u7f6e\u4ee5\u540e\u7684\u90e8\u5206\u622a\u65ad\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[36],"class_list":["post-11465","post","type-post","status-publish","format-standard","hentry","category-gbase8a","tag-36"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/11465","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=11465"}],"version-history":[{"count":87,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/11465\/revisions"}],"predecessor-version":[{"id":11771,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/11465\/revisions\/11771"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=11465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=11465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=11465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}