{"id":41639,"date":"2023-12-06T04:46:28","date_gmt":"2023-02-18T02:10:22","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-postgresql-%e7%9a%84-round-%e5%87%bd%e6%95%b0%e8%ae%a8%e8%ae%ba\/"},"modified":"2024-01-15T11:05:07","modified_gmt":"2024-01-15T03:05:07","slug":"%e5%85%b3%e4%ba%8e-postgresql-%e7%9a%84-round-%e5%87%bd%e6%95%b0%e8%ae%a8%e8%ae%ba","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-postgresql-%e7%9a%84-round-%e5%87%bd%e6%95%b0%e8%ae%a8%e8%ae%ba\/","title":{"rendered":"\u5173\u4e8e PostgreSQL \u7684 round() \u51fd\u6570\u8ba8\u8bba"},"content":{"rendered":"

\u8fd9\u662f PostgreSQL Advent Calendar 2019 \u7b2c13\u5929\u7684\u6587\u7ae0\u3002<\/p>\n

\u8fd9\u6b21\u6211\u4eec\u5c06\u8ba8\u8bbaPostgreSQL\u63d0\u4f9b\u7684round\u51fd\u6570\u3002\u5728PostgreSQL\u7684\u65e5\u672c\u8bed\u6587\u6863\u4e2d\uff0cround()\u88ab\u89e3\u91ca\u4e3a”\u53d6\u6700\u63a5\u8fd1\u7684\u6574\u6570”\uff0c\u5b83\u7ecf\u5e38\u88ab\u7528\u6765\u8fdb\u884c\u6570\u503c\u7684\u56db\u820d\u4e94\u5165\u3002\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u5728PostgreSQL 12\u7684\u7248\u672c\u4e2d\u9a8c\u8bc1\uff0c\u5728\u7ed9round()\u4f20\u9012\u4ece1.0\u52303.0\u7684NUMERIC\u7c7b\u578b\u7684\u503c\uff0c\u4ee50.1\u4e3a\u95f4\u9694\u65f6\u53ef\u4ee5\u89c2\u5bdf\u5230\u4ee5\u4e0b\u7684\u56db\u820d\u4e94\u5165\u7ed3\u679c\u3002<\/p>\n

=#<\/span> SELECT<\/span> num<\/span>,<\/span> round<\/span>(<\/span>num<\/span>::<\/span>NUMERIC<\/span>)<\/span> FROM<\/span> generate_series<\/span>(<\/span>1<\/span>.<\/span>0<\/span>,<\/span> 3<\/span>.<\/span>0<\/span>,<\/span> 0<\/span>.<\/span>1<\/span>)<\/span> num<\/span>;<\/span>\r\n num<\/span> |<\/span> round<\/span> \r\n-----+-------<\/span>\r\n 1<\/span>.<\/span>0<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>1<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>2<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>3<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>4<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>5<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>6<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>7<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>8<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>9<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>0<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>1<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>2<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>3<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>4<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>5<\/span> |<\/span>     3<\/span>\r\n 2<\/span>.<\/span>6<\/span> |<\/span>     3<\/span>\r\n 2<\/span>.<\/span>7<\/span> |<\/span>     3<\/span>\r\n 2<\/span>.<\/span>8<\/span> |<\/span>     3<\/span>\r\n 2<\/span>.<\/span>9<\/span> |<\/span>     3<\/span>\r\n 3<\/span>.<\/span>0<\/span> |<\/span>     3<\/span>\r\n(<\/span>21<\/span> rows<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u5f53\u5c06DOUBLE PRECISION\u7c7b\u578b\u7684\u6570\u503c\u4ece1.0\u52303.0\u4ee50.1\u7684\u7cbe\u5ea6\u4f20\u5165round()\u51fd\u6570\u65f6\uff0c\u7ed3\u679c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
=#<\/span> SELECT<\/span> num<\/span>,<\/span> round<\/span>(<\/span>num<\/span>::<\/span>DOUBLE<\/span> PRECISION<\/span>)<\/span> FROM<\/span> generate_series<\/span>(<\/span>1<\/span>.<\/span>0<\/span>,<\/span> 3<\/span>.<\/span>0<\/span>,<\/span> 0<\/span>.<\/span>1<\/span>)<\/span> num<\/span>;<\/span>\r\n num<\/span> |<\/span> round<\/span> \r\n-----+-------<\/span>\r\n 1<\/span>.<\/span>0<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>1<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>2<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>3<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>4<\/span> |<\/span>     1<\/span>\r\n 1<\/span>.<\/span>5<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>6<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>7<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>8<\/span> |<\/span>     2<\/span>\r\n 1<\/span>.<\/span>9<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>0<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>1<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>2<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>3<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>4<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>5<\/span> |<\/span>     2<\/span>\r\n 2<\/span>.<\/span>6<\/span> |<\/span>     3<\/span>\r\n 2<\/span>.<\/span>7<\/span> |<\/span>     3<\/span>\r\n 2<\/span>.<\/span>8<\/span> |<\/span>     3<\/span>\r\n 2<\/span>.<\/span>9<\/span> |<\/span>     3<\/span>\r\n 3<\/span>.<\/span>0<\/span> |<\/span>     3<\/span>\r\n(<\/span>21<\/span> rows<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u770b\u5230\u8fd9\u4e9bround()\u7684\u6267\u884c\u7ed3\u679c\uff0c\u6709\u6ca1\u6709\u4ec0\u4e48\u5f15\u8d77\u4f60\u5173\u6ce8\u7684\u5730\u65b9\u5417\uff1f<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u5f53round(2.5)\u7684\u7ed3\u679c\u65f6\uff0c\u53c2\u65702.5\u4e3aNUMERIC\u7c7b\u578b\u65f6\u4e3a3\uff0c\u4e3aDOUBLE PRECISION\u7c7b\u578b\u65f6\u4e3a2\uff0c\u8fd9\u4e24\u8005\u7ed3\u679c\u662f\u4e0d\u540c\u7684\u3002\u5c062.5\u56db\u820d\u4e94\u5165\u4e3a3\u662f\u5e38\u89c4\u7684\u56db\u820d\u4e94\u5165\uff0c\u800c\u5c06\u5176\u56db\u820d\u4e94\u5165\u4e3a2\u662f\u6240\u8c13\u7684\u94f6\u884c\u820d\u5165\uff08\u5411\u5076\u6570\u820d\u5165\uff0c\u4e94\u820d\u4e94\u5165\uff09\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728PostgreSQL\u4e2d\uff0cround()\u7684\u884c\u4e3a\u6839\u636e\u53c2\u6570\u7684\u6570\u636e\u7c7b\u578b\u800c\u5f02\uff0cround(NUMERIC)\u8fdb\u884c\u5e38\u89c4\u56db\u820d\u4e94\u5165\uff0c\u800cround(DOUBLE PRECISION)\u5219\u8fdb\u884c\u94f6\u884c\u820d\u5165\u3002<\/p>\n
\u5f53\u6211\u4eec\u5c061.5\u30012.5\u30013.5\u7b49\u6570\u5b57\u5206\u522b\u4ee5NUMERIC\u578b\u548cDOUBLE PRECISION\u578b\u4f20\u9012\u7ed9round()\u51fd\u6570\u65f6\uff0c\u53ef\u4ee5\u6e05\u695a\u5730\u770b\u5230\u7ed3\u679c\u7684\u5dee\u5f02\u3002<\/p>\n
=#<\/span> SELECT<\/span> num<\/span>,<\/span> round<\/span>(<\/span>num<\/span>::<\/span>NUMERIC<\/span>)<\/span> \"NUMERIC\"<\/span>,<\/span> round<\/span>(<\/span>num<\/span>::<\/span>DOUBLE<\/span> PRECISION<\/span>)<\/span> \"DOUBLE\"<\/span> FROM<\/span> generate_series<\/span>(<\/span>1<\/span>.<\/span>5<\/span>,<\/span> 10<\/span>.<\/span>5<\/span>,<\/span> 1<\/span>.<\/span>0<\/span>)<\/span> num<\/span>;<\/span>\r\n num<\/span>  |<\/span> NUMERIC<\/span> |<\/span> DOUBLE<\/span> \r\n------+---------+--------<\/span>\r\n  1<\/span>.<\/span>5<\/span> |<\/span>       2<\/span> |<\/span>      2<\/span>\r\n  2<\/span>.<\/span>5<\/span> |<\/span>       3<\/span> |<\/span>      2<\/span>\r\n  3<\/span>.<\/span>5<\/span> |<\/span>       4<\/span> |<\/span>      4<\/span>\r\n  4<\/span>.<\/span>5<\/span> |<\/span>       5<\/span> |<\/span>      4<\/span>\r\n  5<\/span>.<\/span>5<\/span> |<\/span>       6<\/span> |<\/span>      6<\/span>\r\n  6<\/span>.<\/span>5<\/span> |<\/span>       7<\/span> |<\/span>      6<\/span>\r\n  7<\/span>.<\/span>5<\/span> |<\/span>       8<\/span> |<\/span>      8<\/span>\r\n  8<\/span>.<\/span>5<\/span> |<\/span>       9<\/span> |<\/span>      8<\/span>\r\n  9<\/span>.<\/span>5<\/span> |<\/span>      10<\/span> |<\/span>     10<\/span>\r\n 10<\/span>.<\/span>5<\/span> |<\/span>      11<\/span> |<\/span>     10<\/span>\r\n(<\/span>10<\/span> rows<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u4e0a\u8ff0\u6240\u8ff0\u7684PostgreSQL\u63d0\u4f9b\u7684round\u51fd\u6570\u7684\u884c\u4e3a\u53d6\u51b3\u4e8e\u53c2\u6570\u7684\u6570\u636e\u7c7b\u578b\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u65f6\u9700\u8981\u6ce8\u610f\u3002\u5982\u679c\u60a8\u5728\u73b0\u6709\u7cfb\u7edf\u4e2d\u4f7f\u7528round\u51fd\u6570\uff0c\u8bf7\u786e\u8ba4\u662f\u5426\u5f97\u5230\u4e86\u9884\u671f\u7684\u6267\u884c\u7ed3\u679c\u3002<\/p>\n
\u9644\u52a0\u5185\u5bb9\uff1around()\u51fd\u6570\u7684\u5b9e\u73b0<\/h1>\n
\u5728\u4e2d\u56fd Postgres \u4e2d\u8c03\u7528round(NUMERIC)\u4f1a\u4f7f\u7528\u5185\u90e8\u51fd\u6570numeric_round\u6267\u884c\u56db\u820d\u4e94\u5165\u903b\u8f91\u7684\u5b9e\u73b0\u3002\u800cround(DOUBLE PRECISION)\u4f1a\u8c03\u7528\u5185\u90e8\u51fd\u6570dround\uff0c\u5728\u8be5\u51fd\u6570\u5185\u4ec5\u6267\u884c rint()\u3002<\/p>\n
rint()\u662f\u4e00\u4e2a\u5c06\u503c\u56db\u820d\u4e94\u5165\u5230\u6574\u6570\u7684\u5e93\u8c03\u7528\u3002\u901a\u8fc7\u5e93\u8c03\u7528fesetround()\u53ef\u4ee5\u6539\u53d8rint()\u7684\u820d\u5165\u6a21\u5f0f\u3002\u7531\u4e8ePostgreSQL\u6ca1\u6709\u901a\u8fc7fesetround()\u6539\u53d8\u820d\u5165\u6a21\u5f0f\uff0c\u6240\u4ee5rint()\u9075\u5faa\u9ed8\u8ba4\u7684\u820d\u5165\u6a21\u5f0f1\uff0c\u5373\u94f6\u884c\u820d\u5165\uff0c\u6765\u8fdb\u884c\u503c\u7684\u820d\u5165\u3002<\/p>\n
\u9644\u8d60\u5185\u5bb9\uff1a\u53c2\u6570\u8bbe\u5b9a\u65f6\u7684\u56db\u820d\u4e94\u5165\u3002<\/h1>\n
\u5982\u679c\u5728\u8bbe\u7f6ePostgreSQL\u53c2\u6570\uff08\u4f8b\u5982log_min_duration_statement\uff09\u65f6\u6307\u5b9a\u5e26\u6709\u5c0f\u6570\u70b9\u7684\u503c\uff0c\u8be5\u503c\u5c06\u901a\u8fc7rint\uff08\uff09\u8fdb\u884c\u56db\u820d\u4e94\u5165\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u94f6\u884c\u820d\u5165\u7ed3\u679c\u7684\u6574\u6570\u5c06\u6210\u4e3a\u53c2\u6570\u7684\u8bbe\u5b9a\u503c\u3002<\/p>\n
=#<\/span> SET<\/span> log_min_duration_statement<\/span> TO<\/span> 10<\/span>.<\/span>5<\/span>;<\/span>\r\n\r\n=#<\/span> SHOW<\/span> log_min_duration_statement<\/span>;<\/span>\r\n log_min_duration_statement<\/span> \r\n----------------------------<\/span>\r\n 10<\/span>ms<\/span>\r\n(<\/span>1<\/span> row<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u6839\u636e\u64cd\u4f5c\u7cfb\u7edf\u548c\u73af\u5883\u7684\u4e0d\u540c\uff0c\u53ef\u80fd\u9ed8\u8ba4\u7684\u56db\u820d\u4e94\u5165\u6a21\u5f0f\u4e0d\u662f\u94f6\u884c\u5bb6\u820d\u5165\u3002<\/div>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u662f PostgreSQL Advent Calendar 2019 \u7b2c13\u5929\u7684\u6587\u7ae0\u3002 \u8fd9\u6b21\u6211\u4eec\u5c06\u8ba8\u8bbaPost […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41639","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u5173\u4e8e PostgreSQL \u7684 round() \u51fd\u6570\u8ba8\u8bba - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5173\u4e8e-postgresql-\u7684-round-\u51fd\u6570\u8ba8\u8bba\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5173\u4e8e PostgreSQL \u7684 round() \u51fd\u6570\u8ba8\u8bba\" \/>\n<meta property=\"og:description\" content=\"\u8fd9\u662f PostgreSQL Advent Calendar 2019 \u7b2c13\u5929\u7684\u6587\u7ae0\u3002 \u8fd9\u6b21\u6211\u4eec\u5c06\u8ba8\u8bbaPost […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5173\u4e8e-postgresql-\u7684-round-\u51fd\u6570\u8ba8\u8bba\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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