{"id":200111,"date":"2020-11-15T08:45:27","date_gmt":"2020-11-15T00:45:27","guid":{"rendered":"http:\/\/4563.org\/?p=200111"},"modified":"2020-11-15T08:45:27","modified_gmt":"2020-11-15T00:45:27","slug":"mysql-decimal-%e7%b1%bb%e5%9e%8b%e7%9a%84%e7%bb%9f%e8%ae%a1%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=200111","title":{"rendered":"mysql decimal \u7c7b\u578b\u7684\u7edf\u8ba1\u7684\u95ee\u9898"},"content":{"rendered":"
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mysql decimal \u7c7b\u578b\u7684\u7edf\u8ba1\u7684\u95ee\u9898 <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : singerll <\/span> <\/i> 4<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u73b0\u5728\u6709\u4e2a\u9700\u6c42\uff0c\u6211\u60f3\u626b\u63cf\u4e0b\u6570\u636e\u5e93\u8868\u4e2d\u5b57\u6bb5\u4fe1\u606f\uff08\u6700\u5927\u6700\u5c0f\u503c\u3001\u4e0d\u4e3a\u7a7a\u884c\u6570\uff09\uff0c\u6bd4\u5982 user \u8868\u6709 id\uff0cname\uff0cmoney \u4e09\u4e2a\u5b57\u6bb5\uff0c\u5b9e\u73b0 sql \u5982\u4e0b\uff1a<\/p>\n

select count(\u5b57\u6bb5) from \u8868\u540d \uff1b<\/p>\n

select count(*) from \u8868\u540d where \u5b57\u6bb5 is not null \uff1b<\/p>\n

\u73b0\u5728\u53d1\u73b0\u5176\u4ed6\u5b57\u6bb5\u90fd\u6ca1\u95ee\u9898\uff0c\u53ea\u6709 decimal \u7c7b\u578b\u7684\u5b57\u6bb5\uff0c\u65e0\u6cd5\u8fdb\u884c count\uff0c\u56e0\u6570\u636e\u91cf\u5f88\u5927\uff0csum \u7b49\u51fd\u6570\u4e5f\u4e0d\u9002\u5408\uff0c\u95ee\u4e0b\u5927\u4f6c\u4eec\u6709\u5176\u4ed6\u7684\u65b9\u6cd5\u5417\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (7<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
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    \n
    \u8cc7\u6df1\u5927\u4f6c : basstk <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e2a\u4eba\u8ba4\u4e3a\u6570\u636e\u5e93\u6700\u597d\u53ea\u5b58\u50a8\u6570\u636e,\u5c11\u53c2\u4e0e\u8ba1\u7b97.\u4f60\u53ef\u4ee5\u5148\u628a\u503c\u53d6\u51fa\u6765,\u7136\u540e\u5728\u540e\u7aef\u91cc\u8ba1\u7b97. <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : singerll <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @basstk #1 \u6211\u8fd9\u4e2a\u4e0d\u662f\u4e1a\u52a1\u9700\u6c42\uff0c\u662f\u5386\u53f2\u5e93\u7684\u7edf\u8ba1\u9700\u6c42\uff0c\u4ec5\u6b64\u4e00\u6b21\uff0c\u6ca1\u5fc5\u8981\u5199\u7a0b\u5e8f\uff0c\u800c\u4e14\u6570\u636e\u91cf\u592a\u5927\uff0c\u7a0b\u5e8f\u4e5f\u9876\u4e0d\u4f4f\u554a\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : wysnylc <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @singerll #2 \u5206\u6279\u591a\u6b21 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : zhangysh1995 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u633a\u8ff7\u7684\uff0ccount(\u5b57\u6bb5\uff09\u662f\u884c\u6570\uff0c\u6570\u636e\u7c7b\u578b\u5e94\u8be5\u6ca1\u4ec0\u4e48\u5f71\u54cd\u7684\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : singerll <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zhangysh1995 #4 \u5f88\u5947\u602a\uff0cmax \u548c min \u51fd\u6570\u597d\u50cf\u4e5f\u4e0d\u80fd\u7528 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : singerll <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @wysnylc #3 \u5149\u78c1\u76d8 io \u548c\u7f51\u7edc\u5e26\u5bbd\u90fd\u80fd\u8ba9\u8fd9\u4e2a\u7a0b\u5e8f\u8dd1\u4e24\u5468\u3002\u3002\u3002\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
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    \u8cc7\u6df1\u5927\u4f6c : zarte <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5efa\u8bae\u68c0\u67e5\u4e0b\u7a0b\u5e8f\uff0c\u6216\u8005\u53d1\u4e0b\u5b9e\u9645\u7684\u5177\u4f53 sql \u3002\u4f60\u53d1\u73b0\u7684\u95ee\u9898\u70b9\u5e94\u8be5\u662f\u9519\u7684\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    mysql decimal \u7c7b\u578b\u7684…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/200111"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=200111"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/200111\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=200111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=200111"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=200111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}