{"id":5544,"date":"2024-11-14T09:11:05","date_gmt":"2024-11-14T01:11:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5544\/"},"modified":"2024-11-14T09:11:05","modified_gmt":"2024-11-14T01:11:05","slug":"mysql%e6%80%8e%e4%b9%88%e4%bf%9d%e7%95%99%e4%b8%a4%e4%bd%8d%e5%b0%8f%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5544\/","title":{"rendered":"mysql\u600e\u4e48\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570"},"content":{"rendered":"

\n \u5728 mysql \u4e2d\uff0c\u4f7f\u7528 round() \u51fd\u6570\u53ef\u4fdd\u7559\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u6570\u5b57\uff0c\u5176\u8bed\u6cd5\u4e3a round(x, 2)\uff0c\u5176\u4e2d x \u662f\u8981\u820d\u5165\u7684\u6570\u5b57\u3002\u5176\u4ed6\u793a\u4f8b\u5305\u62ec\u4fdd\u7559\u4e00\u4f4d\u5c0f\u6570\uff08round(x, 1)\uff09\u3001\u56db\u4f4d\u5c0f\u6570\uff08round(x, 4)\uff09\uff0c\u6ce8\u610f\u820d\u5165\u8d1f\u6570\u65f6\u7ed3\u679c\u5c06\u5411\u4e0b\u820d\u5165\uff0c\u5c0f\u6570\u4f4d\u4e3a 5 \u65f6\u820d\u5165\u5230\u6700\u63a5\u8fd1\u7684\u5076\u6570\u3002\n<\/p><\/blockquote>\n

\"mysql\u600e\u4e48\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\u63d2\u56fe\"<\/p>\n

MySQL\u4e2d\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570<\/strong><\/p>\n

\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7ROUND()\u51fd\u6570\u6765\u4fdd\u7559\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u6570\u5b57\u3002\u8be5\u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

ROUND(x, d)<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  • x\u662f\u8981\u820d\u5165\u7684\u6570\u5b57<\/li>\n
  • d\u662f\u8981\u820d\u5165\u5230\u7684\u4f4d\u6570\uff08\u5c0f\u6570\u70b9\u540e\u51e0\u4f4d\uff09<\/li>\n<\/ul>\n
    \u8981\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\uff0c\u53ea\u9700\u5c06d\u8bbe\u7f6e\u4e3a2\u5373\u53ef\u3002\u4f8b\u5982\uff1a<\/p>\n
    SELECT ROUND(123.4567, 2);<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u7ed3\u679c\uff1a<\/p>\n
    123.45<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u5176\u4ed6\u793a\u4f8b<\/strong><\/p>\n
      \n
    • \u4fdd\u7559\u4e00\u4f4d\u5c0f\u6570\uff1aROUND(123.4567, 1)\uff0c\u7ed3\u679c\u4e3a123.5<\/li>\n
    • \u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\uff1aROUND(123.4567, 4)\uff0c\u7ed3\u679c\u4e3a123.4567<\/li>\n<\/ul>\n
      \u6ce8\u610f<\/strong><\/p>\n
        \n
      • \u5982\u679c\u8981\u820d\u5165\u8d1f\u6570\uff0c\u7ed3\u679c\u5c06\u88ab\u5411\u4e0b\u820d\u5165\u3002\u4f8b\u5982\uff0cROUND(-123.4567, 2)\u7684\u7ed3\u679c\u4e3a-123.45\u3002<\/li>\n
      • \u820d\u5165\u65f6\uff0c\u5982\u679c\u5c0f\u6570\u4f4d\u4e0a\u4e3a5\uff0c\u5219\u5c06\u820d\u5165\u5230\u6700\u63a5\u8fd1\u7684\u5076\u6570\u3002\u4f8b\u5982\uff0cROUND(123.455, 2)\u7684\u7ed3\u679c\u4e3a123.46\u3002<\/li>\n<\/ul>\n
        \u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\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":"
        \u5728 mysql \u4e2d\uff0c\u4f7f\u7528 round() \u51fd\u6570\u53ef\u4fdd\u7559\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u6570\u5b57\uff0c\u5176\u8bed\u6cd5\u4e3a round(x, 2)\uff0c\u5176\u4e2d x \u662f\u8981\u820d\u5165\u7684\u6570\u5b57\u3002\u5176\u4ed6\u793a\u4f8b\u5305\u62ec\u4fdd\u7559\u4e00\u4f4d\u5c0f\u6570\uff08round(x, 1)\uff09\u3001\u56db\u4f4d\u5c0f\u6570\uff08round(x, 4)\uff09\uff0c\u6ce8\u610f\u820d\u5165\u8d1f\u6570\u65f6\u7ed3\u679c\u5c06\u5411\u4e0b\u820d\u5165\uff0c\u5c0f\u6570\u4f4d\u4e3a 5 \u65f6\u820d\u5165\u5230\u6700\u63a5\u8fd1\u7684\u5076\u6570\u3002 MySQL\u4e2d\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570 \u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7ROUND()\u51fd\u6570\u6765\u4fdd\u7559\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u6570\u5b57\u3002\u8be5\u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a ROUND(x, d) \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a x\u662f\u8981\u820d\u5165\u7684\u6570\u5b57 d\u662f\u8981\u820d\u5165\u5230\u7684\u4f4d\u6570\uff08\u5c0f\u6570\u70b9\u540e\u51e0\u4f4d\uff09 \u8981\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\uff0c\u53ea\u9700\u5c06d\u8bbe\u7f6e\u4e3a2\u5373\u53ef\u3002\u4f8b\u5982\uff1a SELECT ROUND(123.4567, 2); \u767b\u5f55\u540e\u590d\u5236 \u7ed3\u679c\uff1a 123.45 \u767b\u5f55\u540e\u590d\u5236 \u5176\u4ed6\u793a\u4f8b \u4fdd\u7559\u4e00\u4f4d\u5c0f\u6570\uff1aROUND(123.4567, 1)\uff0c\u7ed3\u679c\u4e3a123.5 \u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\uff1aROUND(123.4567, 4)\uff0c\u7ed3\u679c\u4e3a123.4567 \u6ce8\u610f \u5982\u679c\u8981\u820d\u5165\u8d1f\u6570\uff0c\u7ed3\u679c\u5c06\u88ab\u5411\u4e0b\u820d\u5165\u3002\u4f8b\u5982\uff0cROUND(-123.4567, 2)\u7684\u7ed3\u679c\u4e3a-123.45\u3002 \u820d\u5165\u65f6\uff0c\u5982\u679c\u5c0f\u6570\u4f4d\u4e0a\u4e3a5\uff0c\u5219\u5c06\u820d\u5165\u5230\u6700\u63a5\u8fd1\u7684\u5076\u6570\u3002\u4f8b\u5982\uff0cROUND(123.455, 2)\u7684\u7ed3\u679c\u4e3a123.46\u3002 \u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5544","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5544","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=5544"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5544\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5544"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5544"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5544"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}