{"id":1636,"date":"2016-01-21T10:02:38","date_gmt":"2016-01-21T02:02:38","guid":{"rendered":"http:\/\/www.821121.com\/?p=1636"},"modified":"2022-04-21T10:33:45","modified_gmt":"2022-04-21T02:33:45","slug":"oracle%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e7%9a%84%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1636","title":{"rendered":"oracle\u4fee\u6539\u5b57\u6bb5\u7684\u7c7b\u578b"},"content":{"rendered":"<h1>oracle\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\u7684\u683c\u5f0f<\/h1>\n<p><strong><em>\u8981\u66f4\u6539\u6570\u636e\u7c7b\u578b, \u5219\u8981\u4fee\u6539\u7684\u5217\u6570\u636e\u5fc5\u987b\u4e3a\u7a7a\uff0c\u9664\u975e\u65b0\u7c7b\u578b\u957f\u5ea6\u5b8c\u5168\u80fd\u5305\u542b\u65e7\u7c7b\u578b<\/em><\/strong><\/p>\n<pre><code class=\"language-sql\">alter table \u8868\u540d modify (\u5b57\u6bb5\u540d \u65b0\u7c7b\u578b\u540d);<\/code><\/pre>\n<h2>\u5f53\u5217\u4e2d\u6709\u6570\u636e\u65f6\u600e\u4e48\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b<\/h2>\n<h4>1.\u4fee\u6539\u539f\u5b57\u6bb5\u540d<\/h4>\n<p><code>ALTER TABLE \u8868\u540d RENAME COLUMN \u5b57\u6bb5\u540d TO \u5b57\u6bb5\u540d1;<\/code><\/p>\n<h4>2.\u6dfb\u52a0\u4e00\u4e2a\u548c\u539f\u5b57\u6bb5\u540c\u540d\u7684\u5b57\u6bb5<\/h4>\n<p><code>ALTER TABLE \u8868\u540d ADD \u5b57\u6bb5\u540d  VARCHAR2(30);<\/code><\/p>\n<h4>3.\u5c06\u539f\u6765\u7684\u6570\u636e\u66f4\u65b0\u5230\u65b0\u5b57\u6bb5\u4e2d<\/h4>\n<p>\u6ce8\u610f\uff1a\u4e00\u5b9a\u8981\u663e\u793a\u8fdb\u884c\u6570\u636e\u7c7b\u578b\u8f6c\u6362<br \/>\n<code>UPDATE \u8868\u540d SET \u5b57\u6bb5\u540d = CAST(\u5b57\u6bb5\u540d1 AS VARCHAR2(30));<\/code><\/p>\n<h4>4.\u5220\u9664\u539f\u6765\u7684\u5907\u4efd\u5b57\u6bb5<\/h4>\n<p><code>ALTER TABLE \u8868\u540d DROP COLUMN \u5b57\u6bb5\u540d1;<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>oracle\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\u7684\u683c\u5f0f \u8981\u66f4\u6539\u6570\u636e\u7c7b\u578b, <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1636","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1636","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1636"}],"version-history":[{"count":2,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1636\/revisions"}],"predecessor-version":[{"id":1685,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1636\/revisions\/1685"}],"wp:attachment":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1636"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1636"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}