{"id":5045,"date":"2024-11-14T09:39:33","date_gmt":"2024-11-14T01:39:33","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5045\/"},"modified":"2024-11-14T09:39:33","modified_gmt":"2024-11-14T01:39:33","slug":"oracle%e5%88%a0%e9%99%a4%e5%88%97%e6%80%8e%e4%b9%88%e5%88%a0%e9%99%a4","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5045\/","title":{"rendered":"oracle\u5220\u9664\u5217\u600e\u4e48\u5220\u9664"},"content":{"rendered":"<blockquote><p>\n  oracle \u4e2d\u5220\u9664\u5217\u7684\u65b9\u6cd5\uff1a\u76f4\u63a5\u5220\u9664\uff1aalter table table_name drop column column_name;\u5220\u9664\u5e26\u6709\u9ed8\u8ba4\u503c\u7684\u5217\uff1aalter table table_name alter column column_name drop default; alter table table_name drop column column_name;\u5220\u9664\u5217\u5e76\u7ea7\u8054\u5220\u9664\u7ea6\u675f\uff1aalter table table_name drop column column_name cascad\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/21\/2024052112422192133.jpg\" class=\"aligncenter\" title=\"oracle\u5220\u9664\u5217\u600e\u4e48\u5220\u9664\u63d2\u56fe\" alt=\"oracle\u5220\u9664\u5217\u600e\u4e48\u5220\u9664\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5220\u9664 Oracle \u4e2d\u7684\u5217<\/strong><\/p>\n<p>\u5220\u9664 Oracle \u8868\u4e2d\u7684\u5217\u662f\u4e00\u9879\u5e38\u89c1\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a<\/p>\n<p><strong>1. \u76f4\u63a5\u5220\u9664\u5217<\/strong><\/p>\n<pre>ALTER TABLE table_name DROP COLUMN column_name;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u4ece\u540d\u4e3a &#8220;customers&#8221; \u7684\u8868\u4e2d\u5220\u9664 &#8220;email&#8221; \u5217\uff1a<\/p>\n<pre>ALTER TABLE customers DROP COLUMN email;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u5220\u9664\u5e26\u6709\u9ed8\u8ba4\u503c\u7684\u5217<\/strong><\/p>\n<p>\u5982\u679c\u5217\u5177\u6709\u9ed8\u8ba4\u503c\uff0c\u5219\u4f7f\u7528\u76f4\u63a5\u5220\u9664\u65b9\u6cd5\u5c06\u5931\u8d25\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u5220\u9664\u5e26\u6709\u9ed8\u8ba4\u503c\u7684\u5217\uff1a<\/p>\n<pre>ALTER TABLE table_name ALTER COLUMN column_name DROP DEFAULT;\nALTER TABLE table_name DROP COLUMN column_name;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff0c\u5bf9\u4e8e &#8220;orders&#8221; \u8868\u4e2d\u5e26\u6709\u9ed8\u8ba4\u503c &#8220;0&#8221; \u7684 &#8220;status&#8221; \u5217\uff0c\u5220\u9664\u8bed\u53e5\u4e3a\uff1a<\/p>\n<pre>ALTER TABLE orders ALTER COLUMN status DROP DEFAULT;\nALTER TABLE orders DROP COLUMN status;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. \u5220\u9664\u5217\u5e76\u7ea7\u8054\u5220\u9664\u7ea6\u675f<\/strong><\/p>\n<p>\u5982\u679c\u5217\u53c2\u4e0e\u5916\u952e\u7ea6\u675f\uff0c\u5219\u5728\u5220\u9664\u5217\u4e4b\u524d\u5fc5\u987b\u5220\u9664\u7ea6\u675f\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u5220\u9664\u5217\u5e76\u7ea7\u8054\u5220\u9664\u7ea6\u675f\uff1a<\/p>\n<pre>ALTER TABLE table_name DROP COLUMN column_name CASCADE CONSTRAINTS;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u4ece &#8220;orders&#8221; \u8868\u4e2d\u5220\u9664 &#8220;customer_id&#8221; \u5217\u5e76\u7ea7\u8054\u5220\u9664\u5176\u7ea6\u675f\uff0c\u8bed\u53e5\u4e3a\uff1a<\/p>\n<pre>ALTER TABLE orders DROP COLUMN customer_id CASCADE CONSTRAINTS;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>4. \u5220\u9664\u5217\u5e76\u7ea7\u8054\u7981\u7528\u89e6\u53d1\u5668<\/strong><\/p>\n<p>\u5982\u679c\u5217\u53c2\u4e0e\u89e6\u53d1\u5668\uff0c\u5219\u5728\u5220\u9664\u5217\u4e4b\u524d\u5fc5\u987b\u7981\u7528\u89e6\u53d1\u5668\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u5220\u9664\u5217\u5e76\u7ea7\u8054\u7981\u7528\u89e6\u53d1\u5668\uff1a<\/p>\n<pre>ALTER TABLE table_name DROP COLUMN column_name CASCADE TRIGGERS;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u4ece &#8220;customers&#8221; \u8868\u4e2d\u5220\u9664 &#8220;email&#8221; \u5217\u5e76\u7ea7\u8054\u7981\u7528\u5176\u89e6\u53d1\u5668\uff0c\u8bed\u53e5\u4e3a\uff1a<\/p>\n<pre>ALTER TABLE customers DROP COLUMN email CASCADE TRIGGERS;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5220\u9664\u5217\u600e\u4e48\u5220\u9664\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>oracle \u4e2d\u5220\u9664\u5217\u7684\u65b9\u6cd5\uff1a\u76f4\u63a5\u5220\u9664\uff1aalter table table_name drop column column_name;\u5220\u9664\u5e26\u6709\u9ed8\u8ba4\u503c\u7684\u5217\uff1aalter table table_name alter column column_name drop default; alter table table_name drop column column_name;\u5220\u9664\u5217\u5e76\u7ea7\u8054\u5220\u9664\u7ea6\u675f\uff1aalter table table_name drop column column_name cascad \u5982\u4f55\u5220\u9664 Oracle \u4e2d\u7684\u5217 \u5220\u9664 Oracle \u8868\u4e2d\u7684\u5217\u662f\u4e00\u9879\u5e38\u89c1\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a 1. \u76f4\u63a5\u5220\u9664\u5217 ALTER TABLE table_name DROP COLUMN column_name; \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff0c\u8981\u4ece\u540d\u4e3a &#8220;customers&#8221; \u7684\u8868\u4e2d\u5220\u9664 &#8220;email&#8221; \u5217\uff1a ALTER TABLE customers DROP COLUMN email; \u767b\u5f55\u540e\u590d\u5236 2. \u5220\u9664\u5e26\u6709\u9ed8\u8ba4\u503c\u7684\u5217 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5045","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5045","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5045"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5045\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}