{"id":5336,"date":"2024-11-14T12:18:12","date_gmt":"2024-11-14T04:18:12","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5336\/"},"modified":"2024-11-14T12:18:12","modified_gmt":"2024-11-14T04:18:12","slug":"oracle%e6%80%8e%e4%b9%88%e5%8f%96%e7%ac%ac%e4%b8%80%e8%a1%8c%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5336\/","title":{"rendered":"oracle\u600e\u4e48\u53d6\u7b2c\u4e00\u884c\u6570\u636e"},"content":{"rendered":"

\n oracle \u4e2d\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\u7684\u4e24\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 rownum \u4f2a\u5217\uff1aselect * from table_name where rownum = 1;\u4f7f\u7528 fetch first rows \u51fd\u6570\uff1aselect * from table_name fetch first 1 rows only;\n<\/p><\/blockquote>\n

\"oracle\u600e\u4e48\u53d6\u7b2c\u4e00\u884c\u6570\u636e\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5728Oracle\u4e2d\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e<\/strong><\/p>\n

\u5728Oracle\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\u7684\u5e38\u7528\u65b9\u6cd5\u6709\u4ee5\u4e0b\u4e24\u79cd\uff1a<\/p>\n

\u65b9\u6cd51\uff1a\u4f7f\u7528ROWNUM\u4f2a\u5217<\/strong><\/p>\n

ROWNUM\u4f2a\u5217\u8fd4\u56de\u5f53\u524d\u884c\u7684\u884c\u53f7\u3002\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u67e5\u8be2\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\uff1a<\/p>\n

SELECT * FROM table_name WHERE ROWNUM = 1;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u65b9\u6cd52\uff1a\u4f7f\u7528FETCH FIRST ROWS\u51fd\u6570<\/strong><\/p>\n
FETCH FIRST ROWS\u51fd\u6570\u8fd4\u56de\u6307\u5b9a\u6570\u91cf\u7684\u7b2c\u4e00\u884c\u6570\u636e\u3002\u901a\u8fc7\u5982\u4e0b\u67e5\u8be2\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\uff1a<\/p>\n
SELECT * FROM table_name FETCH FIRST 1 ROWS ONLY;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n
\u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3a”employees”\u7684\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u6570\u636e\uff1a<\/p>\n\n\n\n\n\n\n
emp_id<\/th>\nname<\/th>\nsalary<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nJohn<\/td>\n1000<\/td>\n<\/tr>\n
2<\/td>\nJane<\/td>\n2000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u4f7f\u7528ROWNUM\u4f2a\u5217\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\uff1a<\/strong><\/p>\n
SELECT * FROM employees WHERE ROWNUM = 1;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n\n\n
emp_id<\/th>\nname<\/th>\nsalary<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nJohn<\/td>\n1000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u4f7f\u7528FETCH FIRST ROWS\u51fd\u6570\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\uff1a<\/strong><\/p>\n
SELECT * FROM employees FETCH FIRST 1 ROWS ONLY;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n\n\n
emp_id<\/th>\nname<\/th>\nsalary<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nJohn<\/td>\n1000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u53d6\u7b2c\u4e00\u884c\u6570\u636e\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":"
oracle \u4e2d\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\u7684\u4e24\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 rownum \u4f2a\u5217\uff1aselect * from table_name where rownum = 1;\u4f7f\u7528 fetch first rows \u51fd\u6570\uff1aselect * from table_name fetch first 1 rows only; \u5982\u4f55\u5728Oracle\u4e2d\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e \u5728Oracle\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\u7684\u5e38\u7528\u65b9\u6cd5\u6709\u4ee5\u4e0b\u4e24\u79cd\uff1a \u65b9\u6cd51\uff1a\u4f7f\u7528ROWNUM\u4f2a\u5217 ROWNUM\u4f2a\u5217\u8fd4\u56de\u5f53\u524d\u884c\u7684\u884c\u53f7\u3002\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u67e5\u8be2\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\uff1a SELECT * FROM table_name WHERE ROWNUM = 1; \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd52\uff1a\u4f7f\u7528FETCH FIRST ROWS\u51fd\u6570 FETCH FIRST ROWS\u51fd\u6570\u8fd4\u56de\u6307\u5b9a\u6570\u91cf\u7684\u7b2c\u4e00\u884c\u6570\u636e\u3002\u901a\u8fc7\u5982\u4e0b\u67e5\u8be2\u83b7\u53d6\u7b2c\u4e00\u884c\u6570\u636e\uff1a SELECT * FROM table_name FETCH FIRST 1 ROWS ONLY; \u767b\u5f55\u540e\u590d\u5236 \u793a\u4f8b\uff1a \u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3a”employees”\u7684\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u6570\u636e\uff1a emp_id […]<\/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-5336","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5336","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=5336"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5336\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}