{"id":20349,"date":"2024-01-02T04:42:22","date_gmt":"2024-01-02T04:42:22","guid":{"rendered":"https:\/\/server.hk\/blog\/20349\/"},"modified":"2024-11-14T10:39:59","modified_gmt":"2024-11-14T02:39:59","slug":"postgresql-command-create-sequence","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20349\/","title":{"rendered":"PostgreSQL \u547d\u4ee4\uff1aCREATE SEQUENCE"},"content":{"rendered":"<h1 id=\"postgresql-command-create-sequence-RadxlJdczy\">PostgreSQL \u547d\u4ee4\uff1aCREATE SEQUENCE<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u5f0f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u5ee3\u6cdb\u7684\u529f\u80fd\u8207\u7279\u6027\u3002\u5176\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u547d\u4ee4\u662f <code>CREATE SEQUENCE<\/code> \u547d\u4ee4\u3002\u6b64\u547d\u4ee4\u5141\u8a31\u60a8\u5275\u5efa\u4e00\u500b\u5e8f\u5217\u5c0d\u8c61\uff0c\u81ea\u52d5\u751f\u6210\u4e00\u7cfb\u5217\u552f\u4e00\u7684\u6578\u503c\u3002<\/p>\n<h2 id=\"what-is-a-sequence-RadxlJdczy\">\u4ec0\u9ebc\u662f\u5e8f\u5217\uff1f<\/h2>\n<p>\u5e8f\u5217\u662f PostgreSQL \u4e2d\u7684\u4e00\u7a2e\u6578\u64da\u5eab\u5c0d\u8c61\uff0c\u7528\u4f86\u751f\u6210\u4e00\u7cfb\u5217\u552f\u4e00\u7684\u6578\u5b57\u3002\u5b83\u901a\u5e38\u7528\u4f86\u70ba\u8868\u683c\u5275\u5efa\u4e3b\u9375\u6216\u5176\u4ed6\u552f\u4e00\u7684\u8b58\u5225\u7b26\u3002\u7576\u60a8\u9700\u8981\u81ea\u52d5\u751f\u6210\u552f\u4e00\u503c\uff0c\u800c\u4e0d\u4f9d\u8cf4\u5916\u90e8\u8cc7\u6e90\u6216\u624b\u52d5\u8f38\u5165\u6642\uff0c\u5e8f\u5217\u7279\u5225\u6709\u7528\u3002<\/p>\n<h2 id=\"creating-a-sequence-RadxlJdczy\">\u5275\u5efa\u5e8f\u5217<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\u4f7f\u7528 <code>CREATE SEQUENCE<\/code> \u547d\u4ee4\u5275\u5efa\u5e8f\u5217\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE SEQUENCE sequence_name\r\n    [INCREMENT BY increment]\r\n    [MINVALUE minvalue]\r\n    [MAXVALUE maxvalue]\r\n    [START WITH start]\r\n    [CACHE cache]\r\n    [CYCLE | NO CYCLE];<\/code><\/pre>\n<p>\u8b93\u6211\u5011\u9010\u4e00\u89e3\u91cb\u4e0d\u540c\u7684\u9078\u9805\uff1a<\/p>\n<ul>\n<li><code>sequence_name<\/code>\uff1a\u60a8\u60f3\u5275\u5efa\u7684\u5e8f\u5217\u540d\u7a31\u3002<\/li>\n<li><code>INCREMENT BY increment<\/code>\uff1a\u6307\u5b9a\u5e8f\u5217\u7684\u905e\u589e\u503c\u3002\u9ed8\u8a8d\u70ba 1\u3002<\/li>\n<li><code>MINVALUE minvalue<\/code>\uff1a\u6307\u5b9a\u5e8f\u5217\u7684\u6700\u5c0f\u503c\u3002\u9ed8\u8a8d\u70ba\u6578\u64da\u985e\u578b\u7684\u6700\u5c0f\u503c\u3002<\/li>\n<li><code>MAXVALUE maxvalue<\/code>\uff1a\u6307\u5b9a\u5e8f\u5217\u7684\u6700\u5927\u503c\u3002\u9ed8\u8a8d\u70ba\u6578\u64da\u985e\u578b\u7684\u6700\u5927\u503c\u3002<\/li>\n<li><code>START WITH start<\/code>\uff1a\u6307\u5b9a\u5e8f\u5217\u7684\u8d77\u59cb\u503c\u3002\u9ed8\u8a8d\u70ba\u6578\u64da\u985e\u578b\u7684\u6700\u5c0f\u503c\u3002<\/li>\n<li><code>CACHE cache<\/code>\uff1a\u6307\u5b9a\u70ba\u6027\u80fd\u512a\u5316\u800c\u7de9\u5b58\u7684\u5e8f\u5217\u503c\u6578\u91cf\u3002\u9ed8\u8a8d\u70ba 1\u3002<\/li>\n<li><code>CYCLE | NO CYCLE<\/code>\uff1a\u6307\u5b9a\u7576\u5e8f\u5217\u9054\u5230\u6700\u5c0f\u6216\u6700\u5927\u503c\u6642\uff0c\u662f\u5426\u61c9\u8a72\u5faa\u74b0\u3002\u5982\u679c\u6307\u5b9a\u4e86 <code>CYCLE<\/code>\uff0c\u5e8f\u5217\u5c07\u5f9e\u6700\u5c0f\u503c\u91cd\u65b0\u958b\u59cb\u3002\u5982\u679c\u6307\u5b9a\u4e86 <code>NO CYCLE<\/code>\uff0c\u7576\u9054\u5230\u6700\u5c0f\u6216\u6700\u5927\u503c\u6642\u6703\u51fa\u73fe\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"example-RadxlJdczy\">\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u70ba\u8868\u683c\u751f\u6210\u552f\u4e00\u7684\u5ba2\u6236 ID\uff0c\u4e26\u5275\u5efa\u540d\u70ba <code>customer_id_seq<\/code> \u7684\u5e8f\u5217\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>CREATE SEQUENCE customer_id_seq\r\n    INCREMENT BY 1\r\n    MINVALUE 1\r\n    MAXVALUE 100000\r\n    START WITH 1\r\n    CACHE 10\r\n    NO CYCLE;<\/code><\/pre>\n<p>\u6b64\u547d\u4ee4\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>customer_id_seq<\/code> \u7684\u5e8f\u5217\uff0c\u5f9e 1 \u958b\u59cb\uff0c\u6bcf\u6b21\u905e\u589e 1\u3002\u8a72\u5e8f\u5217\u5c07\u751f\u6210 1 \u5230 100,000 \u4e4b\u9593\u7684\u503c\uff0c\u4e26\u5c07\u7de9\u5b58 10 \u500b\u503c\u4ee5\u9032\u884c\u6027\u80fd\u512a\u5316\u3002\u7576\u5e8f\u5217\u9054\u5230\u6700\u5927\u503c\u6642\uff0c\u5b83\u5c07\u505c\u6b62\u751f\u6210\u503c\u3002<\/p>\n<h2 id=\"summary-RadxlJdczy\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>CREATE SEQUENCE<\/code> \u547d\u4ee4\u5141\u8a31\u60a8\u5275\u5efa\u4e00\u500b\u5e8f\u5217\u5c0d\u8c61\uff0c\u81ea\u52d5\u751f\u6210\u4e00\u7cfb\u5217\u552f\u4e00\u7684\u6578\u5b57\u3002\u5e8f\u5217\u901a\u5e38\u7528\u65bc\u5728\u8868\u683c\u4e2d\u5275\u5efa\u4e3b\u9375\u6216\u5176\u4ed6\u552f\u4e00\u8b58\u5225\u7b26\u3002\u901a\u904e\u4e86\u89e3 <code>CREATE SEQUENCE<\/code> \u547d\u4ee4\u7684\u8a9e\u6cd5\u8207\u9078\u9805\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u5728 PostgreSQL \u6578\u64da\u5eab\u4e2d\u5229\u7528\u5e8f\u5217\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u4e14\u9ad8\u6027\u80fd\u7684 VPS \u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e Server.HK\u3002\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS \u4e3b\u6a5f\u670d\u52d9<\/a> \u63d0\u4f9b\u5353\u8d8a\u7684\u6027\u80fd\u8207\u512a\u8cea\u7684\u5ba2\u6236\u652f\u6301\u3002\u806f\u7e6b\u6211\u5011\u4ee5\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6211\u5011\u7684\u4e3b\u6a5f\u65b9\u6848\uff0c\u4ee5\u53ca\u5982\u4f55\u6eff\u8db3\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u547d\u4ee4\uff1aCR&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-20349","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20349","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=20349"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20349\/revisions"}],"predecessor-version":[{"id":24410,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20349\/revisions\/24410"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}