{"id":2728,"date":"2021-01-04T14:22:17","date_gmt":"2021-01-04T06:22:17","guid":{"rendered":"https:\/\/www.gbase8.cn\/?p=2728"},"modified":"2021-01-04T18:08:45","modified_gmt":"2021-01-04T10:08:45","slug":"gbase-8a%e4%bb%8e%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%95%b0%e5%ad%97%e7%b1%bb%e5%9e%8b%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/2728","title":{"rendered":"\u5357\u5927\u901a\u7528GBase 8a\u4ece\u5b57\u7b26\u4e32\u8f6c\u6570\u5b57\u7c7b\u578b\u7684\u51e0\u79cd\u65b9\u6cd5"},"content":{"rendered":"<p>GBase 8a\u6570\u636e\u5e93\u96c6\u7fa4\uff0c\u53ef\u4ee5\u901a\u8fc7cast, to_number\u7b49\u51fd\u6570\u4ece\u5b57\u7b26\u4e32\u8f6c\u6210\u6570\u5b57\uff0c\u672c\u6587\u4ecb\u7ecd\u5404\u4e2a\u51fd\u6570\u7684\u5199\u6cd5\u548c\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-6a2aef6dbfc26\" 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-6a2aef6dbfc26\"  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\/2728\/#%E5%8F%82%E8%80%83\" >\u53c2\u8003<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbase8.cn\/en\/2728\/#%E7%9B%B8%E4%BC%BC%E5%8A%9F%E8%83%BD\" >\u76f8\u4f3c\u529f\u80fd<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbase8.cn\/en\/2728\/#%E5%8F%8D%E5%90%91%E5%8A%9F%E8%83%BD\" >\u53cd\u5411\u529f\u80fd<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gbase8.cn\/en\/2728\/#%E7%9B%B8%E5%85%B3%E5%8A%9F%E8%83%BD\" >\u76f8\u5173\u529f\u80fd<\/a><\/li><\/ul><\/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\/2728\/#%E9%9A%90%E5%BC%8F%E8%BD%AC%E6%8D%A2\" >\u9690\u5f0f\u8f6c\u6362<\/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\/2728\/#to_number%E5%BC%BA%E5%88%B6%E8%BD%AC%E6%8D%A2\" >to_number\u5f3a\u5236\u8f6c\u6362<\/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\/2728\/#cast_convert%E5%87%BD%E6%95%B0\" >cast \/ convert\u51fd\u6570<\/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<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%9B%B8%E4%BC%BC%E5%8A%9F%E8%83%BD\"><\/span>\u76f8\u4f3c\u529f\u80fd<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><a href=\"https:\/\/www.gbase8.cn\/en\/2737\/\">GBase 8a\u4ece\u5b57\u7b26\u4e32\u8f6c\u6570\u5b57\u7684\u51fd\u6570to_number\u4ecb\u7ecd\u548c\u6837\u4f8b<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%8D%E5%90%91%E5%8A%9F%E8%83%BD\"><\/span>\u53cd\u5411\u529f\u80fd<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><a href=\"https:\/\/www.gbase8.cn\/en\/2735\/\">GBase 8a\u5c06\u6570\u5b57\u8f6c\u5b57\u7b26\u4e32to_char\u51fd\u6570\u529f\u80fd\u4ecb\u7ecd\u548c\u6837\u4f8b<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%9B%B8%E5%85%B3%E5%8A%9F%E8%83%BD\"><\/span>\u76f8\u5173\u529f\u80fd<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><a href=\"https:\/\/www.gbase8.cn\/en\/2653\/\">GBase 8a\u7684\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362cast\u548cconvert\u7684\u7528\u6cd5\u4f8b\u5b50<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%9A%90%E5%BC%8F%E8%BD%AC%E6%8D%A2\"><\/span>\u9690\u5f0f\u8f6c\u6362<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u7edd\u5927\u90e8\u5206\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u7b26\u5408\u6570\u5b57\u7684\u683c\u5f0f\uff0c\u662f\u53ef\u4ee5\u81ea\u52a8\u8f6c\u6210\u6570\u5b57\u7684\uff0c\u4e0d\u9700\u8981\u663e\u793a\u8f6c\u6362\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select '123'\/10;\n+----------+\n| '123'\/10 |\n+----------+\n|     12.3 |\n+----------+\n1 row in set (Elapsed: 00:00:00.03)\n\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"to_number%E5%BC%BA%E5%88%B6%E8%BD%AC%E6%8D%A2\"><\/span>to_number\u5f3a\u5236\u8f6c\u6362<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8be6\u60c5\u8bf7\u53c2\u8003 to_number\u51fd\u6570\u7684\u4f7f\u7528\u6587\u6863\u3002<a href=\"https:\/\/www.gbase8.cn\/en\/2737\/\">GBase 8a\u4ece\u5b57\u7b26\u4e32\u8f6c\u6570\u5b57\u7684\u51fd\u6570to_number\u4ecb\u7ecd\u548c\u6837\u4f8b<\/a><\/p>\n\n\n\n<p>\u5982\u4e0b\u4f8b\u5b50\u589e\u52a0to_number\u51fd\u6570\u540e\uff0c\u4f1a\u81ea\u52a8\u5c06\u6570\u636e\u7c7b\u578b\u4ece\u5b57\u7b26\u4e32\u8f6c\u6210\u6570\u5b57\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; create table a1 as select to_number('123.45') num from dual;\nQuery OK, 1 row affected (Elapsed: 00:00:00.37)\n\ngbase&gt; desc a1;\n+-------+--------+------+-----+---------+-------+\n| Field | Type   | Null | Key | Default | Extra |\n+-------+--------+------+-----+---------+-------+\n| num   | double | NO   |     | NULL    |       |\n+-------+--------+------+-----+---------+-------+\n1 row in set (Elapsed: 00:00:00.00)\n\ngbase&gt; create table a2 as select '123.45' num from dual;\nQuery OK, 1 row affected (Elapsed: 00:00:00.36)\n\ngbase&gt; desc a2;\n+-------+------------+------+-----+---------+-------+\n| Field | Type       | Null | Key | Default | Extra |\n+-------+------------+------+-----+---------+-------+\n| num   | varchar(6) | YES  |     |         |       |\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=\"cast_convert%E5%87%BD%E6%95%B0\"><\/span>cast \/ convert\u51fd\u6570<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p> \u8be5\u51fd\u6570\u7684\u8be6\u60c5\u8bf7\u53c2\u8003  <a href=\"https:\/\/www.gbase8.cn\/en\/2653\/\">GBase 8a\u7684\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362cast\u548cconvert\u7684\u7528\u6cd5\u4f8b\u5b50<\/a><\/p>\n\n\n\n<p>\u5982\u4e0b\u4f8b\u5b50\u662f\u5c06\u5176\u5b83\u7c7b\u578b\uff0c\u5305\u62ec\u5b57\u7b26\u4e32\uff0c\u5f3a\u5236\u8f6c\u5316\u4e3a\u6570\u5b57\u7684\u65b9\u6cd5\uff0c\u5305\u62ecint\u6574\u6570\u548cdecimal\u7684\u6d6e\u70b9\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select cast('123.45' as int);\n+-----------------------+\n| cast('123.45' as int) |\n+-----------------------+\n|                   123 |\n+-----------------------+\n1 row in set, 1 warning (Elapsed: 00:00:00.00)\n\ngbase&gt;\ngbase&gt;\ngbase&gt; select cast('123.45' as decimal(10,3));\n+---------------------------------+\n| cast('123.45' as decimal(10,3)) |\n+---------------------------------+\n|                         123.450 |\n+---------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>","protected":false},"excerpt":{"rendered":"<p>\u5357\u5927\u901a\u7528GBase 8a\u6570\u636e\u5e93\u96c6\u7fa4\uff0c\u53ef\u4ee5\u901a\u8fc7cast, to_number\u7b49\u51fd\u6570\u4ece\u5b57\u7b26\u4e32\u8f6c\u6210\u6570\u5b57\uff0c\u672c\u6587\u6781\u5c11\u5404\u4e2a\u51fd\u6570\u7684\u5199\u6cd5\u548c\u6837\u4f8b\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-2728","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\/2728","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=2728"}],"version-history":[{"count":10,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/2728\/revisions"}],"predecessor-version":[{"id":2822,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/2728\/revisions\/2822"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=2728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=2728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=2728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}