{"id":4987,"date":"2024-11-14T11:54:29","date_gmt":"2024-11-14T03:54:29","guid":{"rendered":"https:\/\/fwq.ai\/blog\/4987\/"},"modified":"2024-11-14T11:54:29","modified_gmt":"2024-11-14T03:54:29","slug":"oracle%e5%ad%97%e6%ae%b5%e6%80%8e%e4%b9%88%e4%bf%ae%e6%94%b9%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/4987\/","title":{"rendered":"oracle\u5b57\u6bb5\u600e\u4e48\u4fee\u6539\u957f\u5ea6"},"content":{"rendered":"

\n \u4fee\u6539oracle\u5b57\u6bb5\u957f\u5ea6\u7684\u6b65\u9aa4\uff1a\u786e\u8ba4\u8981\u4fee\u6539\u7684\u5b57\u6bb5\u548c\u65b0\u957f\u5ea6\u3002\u5907\u4efd\u8868\u3002\u4f7f\u7528alter table\u8bed\u53e5\uff1aalter table modify ( );\u63d0\u4ea4\u66f4\u6539\u3002\u9a8c\u8bc1\u4fee\u6539\u3002\n<\/p><\/blockquote>\n

\"oracle\u5b57\u6bb5\u600e\u4e48\u4fee\u6539\u957f\u5ea6\u63d2\u56fe\"<\/p>\n

Oracle\u5b57\u6bb5\u4fee\u6539\u957f\u5ea6<\/strong><\/p>\n

\u95ee\u9898\uff1a<\/strong>\u5982\u4f55\u4fee\u6539Oracle\u5b57\u6bb5\u7684\u957f\u5ea6\uff1f<\/p>\n

\u89e3\u7b54\uff1a<\/strong><\/p>\n

\u4fee\u6539Oracle\u5b57\u6bb5\u957f\u5ea6\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n

1. \u786e\u5b9a\u8981\u4fee\u6539\u7684\u5b57\u6bb5\u548c\u65b0\u957f\u5ea6<\/strong><\/p>\n

\u786e\u8ba4\u9700\u8981\u4fee\u6539\u957f\u5ea6\u7684\u5b57\u6bb5\u53ca\u5176\u6240\u9700\u7684\u65b0\u957f\u5ea6\u3002\u786e\u4fdd\u65b0\u957f\u5ea6\u5728Oracle\u652f\u6301\u7684\u8303\u56f4\u5185\u3002<\/p>\n

2. \u5907\u4efd\u8868<\/strong><\/p>\n

\u5728\u8fdb\u884c\u4efb\u4f55\u4fee\u6539\u4e4b\u524d\uff0c\u5f3a\u70c8\u5efa\u8bae\u5907\u4efd\u8868\u4ee5\u9632\u4e07\u4e00\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n

3. \u4f7f\u7528ALTER TABLE\u8bed\u53e5<\/strong><\/p>\n

\u4f7f\u7528ALTER TABLE\u8bed\u53e5\u6765\u4fee\u6539\u5b57\u6bb5\u957f\u5ea6\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

ALTER TABLE <table_name> MODIFY (<column_name> <new_data_type>);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  •  \u662f\u8981\u4fee\u6539\u7684\u8868\u7684\u540d\u79f0\u3002 <\/li>\n
  •  \u662f\u8981\u4fee\u6539\u957f\u5ea6\u7684\u5b57\u6bb5\u7684\u540d\u79f0\u3002 <\/li>\n
  •  \u662f\u5b57\u6bb5\u7684\u65b0\u6570\u636e\u7c7b\u578b\uff0c\u5305\u62ec\u65b0\u957f\u5ea6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8981\u5c06VARCHAR2\u5b57\u6bb5\u7684\u957f\u5ea6\u4ece20\u4fee\u6539\u4e3a50\uff0c\u5219\u65b0\u6570\u636e\u7c7b\u578b\u4e3a VARCHAR2(50)\u3002 <\/li>\n<\/ul>\n
    4. \u63d0\u4ea4\u66f4\u6539<\/strong><\/p>\n
    \u6267\u884c\u5b8cALTER TABLE\u8bed\u53e5\u540e\uff0c\u63d0\u4ea4\u66f4\u6539\u4ee5\u4f7f\u4fee\u6539\u751f\u6548\u3002<\/p>\n
    5. \u9a8c\u8bc1\u4fee\u6539<\/strong><\/p>\n
    \u63d0\u4ea4\u66f4\u6539\u540e\uff0c\u4f7f\u7528DESC\u6216SELECT\u8bed\u53e5\u9a8c\u8bc1\u5b57\u6bb5\u957f\u5ea6\u662f\u5426\u5df2\u4fee\u6539\u3002<\/p>\n
    \u793a\u4f8b\uff1a<\/strong><\/p>\n
    \u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3a”customers”\u7684\u8868\uff0c\u5176\u4e2d\u6709\u4e00\u4e2a\u540d\u4e3a”first_name”\u7684VARCHAR2(20)\u5b57\u6bb5\u3002\u8981\u5c06\u6b64\u5b57\u6bb5\u7684\u957f\u5ea6\u4fee\u6539\u4e3a50\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>\n
    ALTER TABLE customers MODIFY (first_name VARCHAR2(50));<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u5b57\u6bb5\u600e\u4e48\u4fee\u6539\u957f\u5ea6\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":"
    \u4fee\u6539oracle\u5b57\u6bb5\u957f\u5ea6\u7684\u6b65\u9aa4\uff1a\u786e\u8ba4\u8981\u4fee\u6539\u7684\u5b57\u6bb5\u548c\u65b0\u957f\u5ea6\u3002\u5907\u4efd\u8868\u3002\u4f7f\u7528alter table\u8bed\u53e5\uff1aalter table modify ( );\u63d0\u4ea4\u66f4\u6539\u3002\u9a8c\u8bc1\u4fee\u6539\u3002 Oracle\u5b57\u6bb5\u4fee\u6539\u957f\u5ea6 \u95ee\u9898\uff1a\u5982\u4f55\u4fee\u6539Oracle\u5b57\u6bb5\u7684\u957f\u5ea6\uff1f \u89e3\u7b54\uff1a \u4fee\u6539Oracle\u5b57\u6bb5\u957f\u5ea6\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a 1. \u786e\u5b9a\u8981\u4fee\u6539\u7684\u5b57\u6bb5\u548c\u65b0\u957f\u5ea6 \u786e\u8ba4\u9700\u8981\u4fee\u6539\u957f\u5ea6\u7684\u5b57\u6bb5\u53ca\u5176\u6240\u9700\u7684\u65b0\u957f\u5ea6\u3002\u786e\u4fdd\u65b0\u957f\u5ea6\u5728Oracle\u652f\u6301\u7684\u8303\u56f4\u5185\u3002 2. \u5907\u4efd\u8868 \u5728\u8fdb\u884c\u4efb\u4f55\u4fee\u6539\u4e4b\u524d\uff0c\u5f3a\u70c8\u5efa\u8bae\u5907\u4efd\u8868\u4ee5\u9632\u4e07\u4e00\u51fa\u73b0\u9519\u8bef\u3002 3. \u4f7f\u7528ALTER TABLE\u8bed\u53e5 \u4f7f\u7528ALTER TABLE\u8bed\u53e5\u6765\u4fee\u6539\u5b57\u6bb5\u957f\u5ea6\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a ALTER TABLE <table_name> MODIFY (<column_name> <new_data_type>); \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a \u662f\u8981\u4fee\u6539\u7684\u8868\u7684\u540d\u79f0\u3002 \u662f\u8981\u4fee\u6539\u957f\u5ea6\u7684\u5b57\u6bb5\u7684\u540d\u79f0\u3002 \u662f\u5b57\u6bb5\u7684\u65b0\u6570\u636e\u7c7b\u578b\uff0c\u5305\u62ec\u65b0\u957f\u5ea6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8981\u5c06VARCHAR2\u5b57\u6bb5\u7684\u957f\u5ea6\u4ece20\u4fee\u6539\u4e3a50\uff0c\u5219\u65b0\u6570\u636e\u7c7b\u578b\u4e3a VARCHAR2(50)\u3002 4. \u63d0\u4ea4\u66f4\u6539 \u6267\u884c\u5b8cALTER TABLE\u8bed\u53e5\u540e\uff0c\u63d0\u4ea4\u66f4\u6539\u4ee5\u4f7f\u4fee\u6539\u751f\u6548\u3002 5. \u9a8c\u8bc1\u4fee\u6539 \u63d0\u4ea4\u66f4\u6539\u540e\uff0c\u4f7f\u7528DESC\u6216SELECT\u8bed\u53e5\u9a8c\u8bc1\u5b57\u6bb5\u957f\u5ea6\u662f\u5426\u5df2\u4fee\u6539\u3002 \u793a\u4f8b\uff1a \u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3a”customers”\u7684\u8868\uff0c\u5176\u4e2d\u6709\u4e00\u4e2a\u540d\u4e3a”first_name”\u7684VARCHAR2(20)\u5b57\u6bb5\u3002\u8981\u5c06\u6b64\u5b57\u6bb5\u7684\u957f\u5ea6\u4fee\u6539\u4e3a50\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a ALTER TABLE customers MODIFY (first_name VARCHAR2(50)); \u767b\u5f55\u540e\u590d\u5236 \u4ee5\u4e0a\u5c31\u662f\u5b57\u6bb5\u600e\u4e48\u4fee\u6539\u957f\u5ea6\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-4987","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/4987","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=4987"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/4987\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=4987"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=4987"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=4987"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}