{"id":1775,"date":"2011-03-09T22:06:20","date_gmt":"2011-03-10T02:06:20","guid":{"rendered":"http:\/\/www.killtest.hk\/?p=1775"},"modified":"2011-03-09T22:10:22","modified_gmt":"2011-03-10T02:10:22","slug":"alter-table","status":"publish","type":"post","link":"https:\/\/www.killtest.hk\/index.php\/unix\/alter-table\/","title":{"rendered":"Oracle \u901a\u904ealter table\u589e\u522a\u6539\u5217\u7684\u8a9e\u6cd5"},"content":{"rendered":"<p>alter table tablename add \uff08column datatype [default value][null\/not null],\u2026\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 alter table tablename modify \uff08column datatype [default value][null\/not null],\u2026\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 alter table tablename drop \uff08column\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 \u9019\u88cf\u5206\u5225\u662f\u4f7f\u7528alter table \u4f86\u589e\u52a0\u3001\u522a\u9664\u548c\u4fee\u6539\u58f9\u500b\u5217\u3002<br \/>\n\u00a0\u00a0\u00a0 \u4e0b\u9762\u662f\u5177\u9ad4\u7684\u4f8b\u5b50\uff1a<br \/>\n\u00a0\u00a0\u00a0 create table test1<br \/>\n\u00a0\u00a0\u00a0 \uff08id varchar2\uff0820\uff09 not null\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 alter table test1<br \/>\n\u00a0\u00a0\u00a0 add \uff08name varchar2\uff0830\uff09 default \u2018\u7121\u540d\u6c0f\u2019 not null\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 alter table test1<br \/>\n\u00a0\u00a0\u00a0 modify \uff08name varchar2\uff0816\uff09 default \u2018unknown\u2019\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 alter table test1<br \/>\n\u00a0\u00a0\u00a0 drop column name;<br \/>\n\u00a0\u00a0\u00a0 \u4ee5\u4e0a\u5206\u5225\u5efa\u7acb\u58f9\u500b\u8868\uff0c\u589e\u52a0\uff0c\u66f4\u6539\uff0c\u522a\u9664\u58f9\u500b\u5217\u3002\u5176\u4e2d\u9700\u8981\u8a3b\u610f\u7684\u662f\u5982\u679c\u67d0\u58f9\u5217\u4e2d\u5df2\u7d93\u5b58\u5728\u503c\uff0c\u5982\u679c\u59b3\u8981\u4fee\u6539\u7684\u70ba\u6bd4\u9019\u4e9b\u503c\u9084\u8981\u7a84\u7684\u5217\u5bec\u9019\u6a23\u5c07\u6703\u51fa\u73fe\u58f9\u500b\u932f\u8aa4\u3002<br \/>\n\u00a0\u00a0\u00a0 \u4f8b\u5982\u524d\u9762\u5982\u679c\u6211\u5011\u63d2\u5165\u58f9\u500b\u503c<br \/>\n\u00a0\u00a0\u00a0 insert into test1<br \/>\n\u00a0\u00a0\u00a0 values \uff08\u20191\u2032\uff0c\u2019\u6211\u5011\u5f88\u611b\u59b3\u2019\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 \u7136\u5f8c\u66fe\u4fee\u6539\u5217\uff1a alter table test1<br \/>\n\u00a0\u00a0\u00a0 modify \uff08name varchar2\uff088\uff09\uff09\uff1b<br \/>\n\u00a0\u00a0\u00a0 \u5c07\u6703\u5f97\u5230\u4ee5\u4e0b\u932f\u8aa4\uff1a<br \/>\n\u00a0\u00a0\u00a0 ERROR \u4f4d\u65bc\u7b2c 2 \u884c\uff1a<br \/>\n\u00a0\u00a0\u00a0 ORA-01441: \u7121\u6cd5\u6e1b\u5c0f\u5217\u9577\u5ea6\uff0c \u56e0\u70ba\u58f9\u4e9b\u503c\u904e\u5927<br \/>\n\u00a0\u00a0\u00a0 PS:\u6539\u8b8a\u5df2\u5b58\u5728\u7684\u8868\u7684\u5217\u540d<br \/>\n\u00a0\u00a0\u00a0 alter table table_name rename column col_old to col_new<\/p>\n","protected":false},"excerpt":{"rendered":"<p>alter table tablename add \uff08column datatype [default val [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[531],"tags":[741,2748,742],"class_list":["post-1775","post","type-post","status-publish","format-standard","hentry","category-unix","tag-alter","tag-oracle","tag-table"],"_links":{"self":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts\/1775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/comments?post=1775"}],"version-history":[{"count":0,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/posts\/1775\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/media?parent=1775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/categories?post=1775"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.killtest.hk\/index.php\/wp-json\/wp\/v2\/tags?post=1775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}