{"id":199942,"date":"2025-05-06T09:55:02","date_gmt":"2025-05-06T01:55:02","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199942\/"},"modified":"2025-05-06T09:55:02","modified_gmt":"2025-05-06T01:55:02","slug":"oracle-lpad%e5%87%bd%e6%95%b0%e8%a7%a3%e6%9e%90%ef%bc%9a%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%a1%ab%e5%85%85%e7%9a%84%e9%ab%98%e6%95%88%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199942\/","title":{"rendered":"Oracle LPAD\u51fd\u6570\u89e3\u6790\uff1a\u5b57\u7b26\u4e32\u586b\u5145\u7684\u9ad8\u6548\u6280\u5de7"},"content":{"rendered":"

<\/b> <\/p>\n

Oracle LPAD\u51fd\u6570\u89e3\u6790\uff1a\u5b57\u7b26\u4e32\u586b\u5145\u7684\u9ad8\u6548\u6280\u5de7<\/h1>\n

\u5b66\u4e60\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0\u5c06\u4f1a\u4ecb\u7ecd\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

Oracle\u6570\u636e\u5e93\u4e2d\u63d0\u4f9b\u4e86\u5f88\u591a\u5e38\u7528\u7684\u51fd\u6570\uff0c\u5176\u4e2dLPAD\u51fd\u6570\u662f\u4e00\u4e2a\u975e\u5e38\u5b9e\u7528\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u5728\u5b57\u7b26\u4e32\u7684\u5de6\u4fa7\u586b\u5145\u6307\u5b9a\u7684\u5b57\u7b26\u3002LPAD\u51fd\u6570\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

LPAD(string, length, fill_string)<\/pre>\n
\u5176\u4e2d\uff0cstring\u662f\u8981\u586b\u5145\u7684\u5b57\u7b26\u4e32\uff0clength\u662f\u586b\u5145\u540e\u5e0c\u671b\u5f97\u5230\u7684\u603b\u957f\u5ea6\uff0cfill_string\u662f\u7528\u4e8e\u586b\u5145\u7684\u5b57\u7b26\u3002\u4e0b\u9762\u5c06\u901a\u8fc7\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u6765\u8be6\u7ec6\u89e3\u91caLPAD\u51fd\u6570\u7684\u7528\u6cd5\u3002<\/p>\n
\u9996\u5148\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8868\u683c\u5305\u542b\u5458\u5de5\u7684ID\u548c\u540d\u5b57\uff0c\u6211\u4eec\u60f3\u8981\u5728ID\u7684\u5de6\u4fa7\u586b\u51450\uff0c\u4f7f\u5f97ID\u603b\u957f\u5ea6\u4e3a5\u4f4d\uff1a<\/p>\n
SELECT LPAD(employee_id, 5, '0') AS padded_id, employee_name\nFROM employees;<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0cLPAD\u51fd\u6570\u5c06\u4f1a\u628aemployee_id\u7684\u503c\u586b\u5145\u4e3a5\u4f4d\uff0c\u4e0d\u8db3\u7684\u4f4d\u7f6e\u75280\u6765\u586b\u5145\uff0c\u7136\u540e\u5c06\u7ed3\u679c\u4f5c\u4e3apadded_id\u8fdb\u884c\u67e5\u8be2\u8f93\u51fa\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u770b\u4e00\u4e2a\u7a0d\u5fae\u590d\u6742\u4e00\u70b9\u7684\u793a\u4f8b\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8868\u683c\u5305\u542b\u4ea7\u54c1\u7684\u5546\u54c1\u7f16\u53f7\u548c\u540d\u79f0\uff0c\u6211\u4eec\u60f3\u8981\u5728\u5546\u54c1\u7f16\u53f7\u7684\u5de6\u4fa7\u586b\u5145\u5b57\u6bcd\u201cP\u201d\uff0c\u4f7f\u5f97\u5546\u54c1\u7f16\u53f7\u603b\u957f\u5ea6\u4e3a8\u4f4d\uff1a<\/p>\n
SELECT LPAD('P' || product_id, 8, 'P') AS padded_product_id, product_name\nFROM products;<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5148\u4f7f\u7528\u62fc\u63a5\u64cd\u4f5c\u7b26\u201c||\u201d\u5c06\u5b57\u6bcd\u201cP\u201d\u548cproduct_id\u8fde\u63a5\u8d77\u6765\uff0c\u7136\u540e\u518d\u5bf9\u7ed3\u679c\u5e94\u7528LPAD\u51fd\u6570\uff0c\u586b\u5145\u4e3a\u603b\u957f\u5ea6\u4e3a8\u4f4d\u7684\u5546\u54c1\u7f16\u53f7\u3002<\/p>\n
\u9664\u4e86\u586b\u5145\u5b57\u7b26\uff0cLPAD\u51fd\u6570\u8fd8\u53ef\u4ee5\u7528\u6765\u5728\u5b57\u7b26\u4e32\u5de6\u4fa7\u586b\u5145\u5176\u4ed6\u5b57\u7b26\u4e32\uff0c\u6bd4\u5982\u586b\u5145\u7a7a\u683c\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8868\u683c\u5305\u542b\u8ba2\u5355\u53f7\u548c\u8ba2\u5355\u91d1\u989d\uff0c\u6211\u4eec\u60f3\u8981\u5728\u8ba2\u5355\u53f7\u7684\u5de6\u4fa7\u586b\u5145\u7a7a\u683c\uff0c\u4f7f\u5f97\u8ba2\u5355\u53f7\u603b\u957f\u5ea6\u4e3a10\u4f4d\uff1a<\/p>\n
SELECT LPAD(order_number, 10, ' ') AS padded_order_number, order_amount\nFROM orders;<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0cLPAD\u51fd\u6570\u5c06\u4f1a\u628aorder_number\u7684\u503c\u586b\u5145\u4e3a10\u4f4d\uff0c\u4e0d\u8db3\u7684\u4f4d\u7f6e\u7528\u7a7a\u683c\u6765\u586b\u5145\uff0c\u7136\u540e\u5c06\u7ed3\u679c\u4f5c\u4e3apadded_order_number\u8fdb\u884c\u67e5\u8be2\u8f93\u51fa\u3002<\/p>\n
\u603b\u7684\u6765\u8bf4\uff0cOracle\u7684LPAD\u51fd\u6570\u662f\u4e00\u4e2a\u975e\u5e38\u7075\u6d3b\u4e14\u5b9e\u7528\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u586b\u5145\u5b57\u7b26\u4e32\uff0c\u4f7f\u5f97\u6570\u636e\u5904\u7406\u66f4\u52a0\u65b9\u4fbf\u548c\u9ad8\u6548\u3002\u901a\u8fc7\u4ee5\u4e0a\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u76f8\u4fe1\u8bfb\u8005\u5df2\u7ecf\u5bf9LPAD\u51fd\u6570\u7684\u7528\u6cd5\u6709\u4e86\u66f4\u6df1\u5165\u7684\u4e86\u89e3\uff0c\u5e0c\u672f\u53ef\u4ee5\u5728\u5b9e\u9645\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\u52a0\u4ee5\u8fd0\u7528\u3002<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aOracle LPAD\u51fd\u6570\u89e3\u6790\uff1a\u5b57\u7b26\u4e32\u586b\u5145\u7684\u9ad8\u6548\u6280\u5de7\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6570\u636e\u5e93\u77e5\u8bc6\uff01<\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
Oracle LPAD\u51fd\u6570\u89e3\u6790\uff1a...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199942","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199942","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=199942"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199942\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199942"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199942"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}