{"id":5328,"date":"2024-11-14T13:06:53","date_gmt":"2024-11-14T05:06:53","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5328\/"},"modified":"2024-11-14T13:06:53","modified_gmt":"2024-11-14T05:06:53","slug":"oracle%e6%80%8e%e4%b9%88%e5%8a%a0%e5%88%a0%e9%99%a4%e5%ad%97%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5328\/","title":{"rendered":"oracle\u600e\u4e48\u52a0\u5220\u9664\u5b57\u6bb5"},"content":{"rendered":"<blockquote><p>\n  oracle \u6dfb\u52a0\u5b57\u6bb5\uff1a\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u8bed\u6cd5\uff1aalter table table_name add column_name data_type\u3002\u5220\u9664\u5b57\u6bb5\uff1a\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u8bed\u6cd5\uff1aalter table table_name drop column column_name\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/26\/2024052619365689011.jpg\" class=\"aligncenter\" title=\"oracle\u600e\u4e48\u52a0\u5220\u9664\u5b57\u6bb5\u63d2\u56fe\" alt=\"oracle\u600e\u4e48\u52a0\u5220\u9664\u5b57\u6bb5\u63d2\u56fe\" \/><\/p>\n<p><strong>Oracle \u6dfb\u52a0\u548c\u5220\u9664\u8868\u5b57\u6bb5<\/strong><\/p>\n<p><strong>\u6dfb\u52a0\u5b57\u6bb5<\/strong><\/p>\n<p><strong>\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528 ALTER TABLE \u8bed\u53e5<\/strong><\/p>\n<p>\u8bed\u6cd5\uff1a<\/p>\n<pre>ALTER TABLE table_name ADD column_name data_type;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>ALTER TABLE employees ADD department_id VARCHAR2(10);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528 CREATE TABLE \u8bed\u53e5\uff08\u6dfb\u52a0\u65b0\u5217\uff09<\/strong><\/p>\n<p>\u8bed\u6cd5\uff1a<\/p>\n<pre>CREATE TABLE new_table_name (column_name data_type) AS\nSELECT column1, column2, ..., column_n, new_column_name\nFROM original_table_name;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>CREATE TABLE employees_with_department_id (employee_id NUMBER, name VARCHAR2(50), department_id VARCHAR2(10)) AS\nSELECT employee_id, name, NULL\nFROM employees;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u5220\u9664\u5b57\u6bb5<\/strong><\/p>\n<p><strong>\u65b9\u6cd5\uff1a\u4f7f\u7528 ALTER TABLE \u8bed\u53e5<\/strong><\/p>\n<p>\u8bed\u6cd5\uff1a<\/p>\n<pre>ALTER TABLE table_name DROP COLUMN column_name;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>ALTER TABLE employees DROP COLUMN address;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u52a0\u5220\u9664\u5b57\u6bb5\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 \u6dfb\u52a0\u5b57\u6bb5\uff1a\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u8bed\u6cd5\uff1aalter table table_name add column_name data_type\u3002\u5220\u9664\u5b57\u6bb5\uff1a\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u8bed\u6cd5\uff1aalter table table_name drop column column_name\u3002 Oracle \u6dfb\u52a0\u548c\u5220\u9664\u8868\u5b57\u6bb5 \u6dfb\u52a0\u5b57\u6bb5 \u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528 ALTER TABLE \u8bed\u53e5 \u8bed\u6cd5\uff1a ALTER TABLE table_name ADD column_name data_type; \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff1a ALTER TABLE employees ADD department_id VARCHAR2(10); \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528 CREATE TABLE \u8bed\u53e5\uff08\u6dfb\u52a0\u65b0\u5217\uff09 \u8bed\u6cd5\uff1a CREATE TABLE new_table_name (column_name data_type) AS SELECT column1, column2, [&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-5328","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5328","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=5328"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5328\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}