{"id":1030,"date":"2019-06-05T14:12:53","date_gmt":"2019-06-05T06:12:53","guid":{"rendered":"http:\/\/www.hefeiyu.com\/?p=1030"},"modified":"2019-06-05T14:12:53","modified_gmt":"2019-06-05T06:12:53","slug":"%e5%b8%b8%e8%a7%81oracle%ef%bc%bfsql%e9%99%b7%e9%98%b1","status":"publish","type":"post","link":"https:\/\/www.hefeiyu.com\/?p=1030","title":{"rendered":"\u5e38\u89c1Oracle\uff3fSQL\u9677\u9631"},"content":{"rendered":"

\u5e38\u89c1SQL\u9677\u9631<\/strong><\/p>\n

\u8868\u680f\u4f4d\u8bf4\u660e\u53ca\u6570\u636edemo\u5982\u4e0b\uff1a<\/p>\n

t_salary<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n
\u5de5\u8d44\u5e74\u6708<\/td>\n\u9879\u6b21<\/td>\n\u5de5\u53f7<\/td>\n\u5165\u804c\u65e5\u671f<\/td>\n\u57fa\u672c\u5de5\u8d44<\/td>\n\u7ee9\u6548<\/td>\n<\/tr>\n
slip<\/strong><\/td>\nitem<\/strong><\/td>\nidcard<\/strong><\/td>\nemploydate<\/strong><\/td>\nbase_salary<\/strong><\/td>\nperformance_salary<\/strong><\/td>\n<\/tr>\n
201308<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02<\/td>\n1156888<\/td>\n2010-08-11<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a05500.00<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a01000.00<\/td>\n<\/tr>\n
201409<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a01<\/td>\n<\/td>\n <\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6500.00<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 500.00<\/td>\n<\/tr>\n
201409<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a02<\/td>\n1156888<\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
201308<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a01<\/td>\n1234568<\/td>\n2009-10-20<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3000.00<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 500.00<\/td>\n<\/tr>\n
201410<\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a01<\/td>\n1134807<\/td>\n <\/td>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8000.00<\/td>\n <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

———————————————————————————————————————————————<\/p>\n

1<\/strong>\u3001SUM()\u6c42\u548c\uff1a<\/strong>\u65e0\u8d44\u6599\u65f6SUM()\u662fNULL\uff0c\u800c\u4e0d\u662f0<\/p>\n

\u6709\u8d44\u6599\u65f6\uff0c\u67d0\u4e00\u7b14\u88absum\u7684\u6570\u636e\u4e3aNULL\u503c\u6ca1\u6709\u5173\u7cfb\uff0c\u4f9d\u7136\u53ef\u4ee5\u6b63\u786esum<\/p>\n

\"IMG_256\"<\/p>\n

\u4fee\u6b63\u540e\u7684\u5199\u6cd5\uff0c\u6ce8\u610f\u4e24\u79cdnvl\u5904\u7406\uff0cnvl\u7684\u4f4d\u7f6e\u4e0d\u5bf9\u4e5f\u4f1a\u5bfc\u81f4\u7ed3\u679c\u4e3aNULL<\/p>\n

    \n
  1. SELECT<\/strong>\u00a0sum(nvl(base_salary,0)),\u00a0\u00a0–\u00d7\uff0c\u7ed3\u679c\u4f9d\u7136\u4e3aNULL<\/li>\n
  2. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0nvl(sum(base_salary),0)\u00a0\u00a0\u00a0–\u221a<\/li>\n
  3. \u00a0\u00a0FROM<\/strong>\u00a0t_salary<\/li>\n
  4. \u00a0\u00a0WHERE<\/strong>\u00a0slip\u00a0=\u00a0‘200812’<\/li>\n<\/ol>\n

    ———————————————————————————————————————————————<\/p>\n

    2<\/strong>\u3001NULL\u503c\u7684\u53c2\u4e0e\u7684\u4efb\u4f55\u8ba1\u7b97\uff1a<\/strong>\u8ba1\u7b97\u7ed3\u679c\u540e\u4f9d\u7136\u90fd\u662fNULL<\/p>\n

      \n
    1. –\u5c06\u5e74\u6708\u4e3a201410\u00a0\u5de5\u53f7\u4e3a1134807\u7684\u7ee9\u6548\u4e0a\u8c031000\uff08\u539f\u672c\u662fnull\uff09<\/li>\n
    2. UPDATE<\/strong>\u00a0t_salary<\/li>\n
    3. \u00a0\u00a0\u00a0SET<\/strong>\u00a0performance_salary\u00a0=\u00a0performance_salary\u00a0+\u00a01000<\/li>\n
    4. \u00a0WHERE<\/strong>\u00a0slip\u00a0=\u00a0‘201410’<\/li>\n
    5. \u00a0\u00a0\u00a0AND\u00a0idcard\u00a0=\u00a0‘1134807’<\/li>\n
    6. <\/li>\n
    7. –\u4e0a\u8c03\u7ee9\u6548\u66f4\u65b0\u63d0\u4ea4\u540e\u518d\u67e5\u8be2\u6570\u636e<\/li>\n
    8. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary<\/li>\n
    9. \u00a0WHERE<\/strong>\u00a0slip\u00a0=\u00a0‘201410’<\/li>\n
    10. \u00a0\u00a0\u00a0AND\u00a0idcard\u00a0=\u00a0‘1134807’<\/li>\n<\/ol>\n

      \u7ed3\u679c\u6570\u636e\u4f9d\u7136\u6ca1\u66f4\u65b0\u4e0a\u53bb\uff1a<\/p>\n

      \"IMG_257\"<\/p>\n

      \u5e94\u8be5\u8fd9\u6837\u5199\uff1a\u7528nvl\u5904\u7406\u7a7a\u503c<\/p>\n

        \n
      1. UPDATE<\/strong>\u00a0t_salary<\/li>\n
      2. \u00a0\u00a0\u00a0SET<\/strong>\u00a0performance_salary\u00a0=\u00a0nvl(performance_salary,0)\u00a0+\u00a01000<\/li>\n
      3. \u00a0WHERE<\/strong>\u00a0slip\u00a0=\u00a0‘201410’<\/li>\n
      4. \u00a0\u00a0\u00a0AND\u00a0idcard\u00a0=\u00a0‘1134807’<\/li>\n<\/ol>\n

        ———————————————————————————————————————————————<\/p>\n

        3<\/strong>\u3001NULL\u503c \u4e0d\u7b49\u540c \u7a7a\u503c’ ‘<\/strong><\/p>\n

          \n
        1. –\u2460\uff1a\u7ed3\u679c\u4e3a4<\/li>\n
        2. SELECT<\/strong>\u00a0COUNT(*)\u00a0FROM<\/strong>\u00a0t_salary<\/li>\n
        3. \u00a0WHERE<\/strong>\u00a0idcard\u00a0IN\u00a0(‘1234568′,’1156888′,’1134807’)\u00a0OR\u00a0idcard\u00a0=\u00a0”;\u00a0\u00a0\u00a0\u00a0–”\uff0c\u7a7a<\/li>\n
        4. –\u2461\u00a0\uff1a\u7ed3\u679c\u4e3a5\uff0ct_salary\u8868\u91cc\u9762\u5b9e\u9645\u4e5f\u662f5\u6761\u6570\u636e<\/li>\n
        5. SELECT<\/strong>\u00a0COUNT(*)\u00a0FROM<\/strong>\u00a0t_salary<\/li>\n
        6. \u00a0WHERE<\/strong>\u00a0idcard\u00a0IN\u00a0(‘1234568′,’1156888′,’1134807’)\u00a0OR\u00a0idcard\u00a0IS<\/strong>\u00a0NULL\u00a0–NULL<\/li>\n<\/ol>\n

          ———————————————————————————————————————————————<\/p>\n

          4<\/strong>\u3001\u53d6\u7b2c\u4e00\u6761\u6570\u636e\/\u524d\u51e0\u6761\u6570\u636e\uff1a\u4f60\u662f\u5426\u5728\u7528ORDER BY \u548c rownum=1 \/ rownum<xx\u00a0\u6765SQL<\/strong><\/p>\n

          \u7279\u522b\u8bf4\u660e\uff1a\u4e0a\u9762\u63d0\u4f9b\u7684demo\u4e2d\u67092\u6761slip=201308\u7684\u6570\u636e\uff0c\u4e14item\u5206\u522b\u4e3a1\u30012\uff0c\u5176\u4e2ditem=2\u7684\u5148\u63d2\u5165\u6570\u636e\u5e93\uff0c\u518d\u63d2\u5165item=1\u7684\u6570\u636e<\/p>\n

            \n
          1. –\u53d6201308\u5e74\u6708\u91cc\u9762ORDER\u00a0BY\u00a0slip\u00a0ASC,item\u00a0ASC\u7684\u7b2c\u4e00\u7b14\u6570\u636e<\/li>\n
          2. –\u00d7\uff0c\u5f88\u591a\u4eba\u7ecf\u5e38\u5982\u4e0b\u5199SQL\uff0corder\u00a0by\u6392\u5e8f\u7136\u540e\u4ee5\u4e3arownum=1\u5c31\u662f\u53d6\u7684\u7b2c\u4e00\u6761\u60f3\u8981\u7684\u6570\u636e<\/li>\n
          3. SELECT<\/strong>\u00a0rowid,rownum,t_salary.*\u00a0FROM<\/strong>\u00a0t_salary<\/li>\n
          4. \u00a0WHERE<\/strong>\u00a0slip=’201308′<\/li>\n
          5. \u00a0\u00a0\u00a0AND\u00a0rownum\u00a0=\u00a01<\/li>\n
          6. \u00a0ORDER<\/strong>\u00a0BY<\/strong>\u00a0slip\u00a0ASC<\/strong>,item\u00a0ASC<\/strong><\/li>\n<\/ol>\n

            \"IMG_258\"<\/p>\n

            SQL\u5e94\u8be5\u5982\u4e0b\u8fd9\u6837\u5199\uff1a<\/p>\n

              \n
            1. –\u5148\u5c06\u67e5\u8be2\u6392\u5e8f\u505a\u4e3a1\u4e2a\u7ed3\u679c\u96c6\uff0c\u518d\u4ece\u8fd9\u4e2a\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u96c6\u91cc\u9762\u518d\u53d6rownum=1\u7684\u6570\u636e,\u53d6\u5f97\u5230\u624d\u662f\u6309\u6392\u5e8f\u540e\u7684\u7b2c\u4e00\u6761\u6570\u636e<\/li>\n
            2. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong><\/li>\n
            3. \u00a0\u00a0(SELECT<\/strong>\u00a0t_salary.*\u00a0FROM<\/strong>\u00a0t_salary<\/li>\n
            4. \u00a0\u00a0\u00a0\u00a0WHERE<\/strong>\u00a0slip=’201308′<\/li>\n
            5. \u00a0\u00a0\u00a0–AND\u00a0rownum\u00a0=\u00a01<\/li>\n
            6. \u00a0\u00a0ORDER<\/strong>\u00a0BY<\/strong>\u00a0slip\u00a0ASC<\/strong>,item\u00a0ASC<\/strong><\/li>\n
            7. \u00a0\u00a0)<\/li>\n
            8. \u00a0WHERE<\/strong>\u00a0rownum\u00a0=\u00a01<\/li>\n
            9. \u00a0–ORDER\u00a0BY\u00a0slip\u00a0ASC,item\u00a0ASC<\/li>\n<\/ol>\n

              ———————————————————————————————————————————————<\/p>\n

              5<\/strong>\u3001NULL\u3001”\u3001’ ‘ \u4e4b\u95f4\u7684\u533a\u522b<\/strong><\/p>\n

                \n
              1. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary\u00a0WHERE<\/strong>\u00a0NULL\u00a0=\u00a0NULL;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0–\u00d7\uff0c\u4e0eNULL\u6bd4\u8f83\u5e94\u8be5\u4f7f\u7528\u00a0is\u00a0\u6216\u00a0is\u00a0not<\/li>\n
              2. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary\u00a0WHERE<\/strong>\u00a0NULL\u00a0is<\/strong>\u00a0NULL;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0–true<\/li>\n
              3. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary\u00a0WHERE<\/strong>\u00a0NULL\u00a0is<\/strong>\u00a0not\u00a0NULL;\u00a0\u00a0–false<\/li>\n
              4. <\/li>\n
              5. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary\u00a0WHERE<\/strong>\u00a0”\u00a0\u00a0is<\/strong>\u00a0NULL;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0–true\uff0c\u00a0”\u4e2d\u95f4\u6ca1\u4efb\u4f55\u7a7a\u683c<\/li>\n
              6. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary\u00a0WHERE<\/strong>\u00a0”\u00a0\u00a0is<\/strong>\u00a0not\u00a0NULL;\u00a0\u00a0\u00a0–false\uff0c”\u4e2d\u95f4\u6ca1\u4efb\u4f55\u7a7a\u683c<\/li>\n
              7. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary\u00a0WHERE<\/strong>\u00a0‘\u00a0‘\u00a0is<\/strong>\u00a0NULL;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0–false\uff0c’\u00a0‘\u4e2d\u95f4\u6709\u4e00\u4e2a\u7a7a\u683c<\/li>\n
              8. SELECT<\/strong>\u00a0*\u00a0FROM<\/strong>\u00a0t_salary\u00a0WHERE<\/strong>\u00a0‘\u00a0‘\u00a0is<\/strong>\u00a0not\u00a0NULL;\u00a0\u00a0\u00a0–true\uff0c\u00a0‘\u00a0‘\u4e2d\u95f4\u6709\u4e00\u4e2a\u7a7a\u683c<\/li>\n<\/ol>\n

                ———————————————————————————————————————————————<\/p>\n

                \u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a\u8d6b\u975e\u57df<\/a> » \u5e38\u89c1Oracle\uff3fSQL\u9677\u9631<\/a><\/p>","protected":false},"excerpt":{"rendered":"

                \u5e38\u89c1SQL\u9677\u9631 \u8868\u680f\u4f4d\u8bf4\u660e\u53ca\u6570\u636edemo\u5982\u4e0b\uff1a t_salary \u5de5\u8d44\u5e74\u6708 \u9879\u6b21 \u5de5\u53f7 \u5165\u804c\u65e5\u671f \u57fa\u672c\u5de5\u8d44 \u7ee9\u6548 slip item idcard employdate base_salary performance_salary 201308 \u00a0\u00a0 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[309,216],"class_list":["post-1030","post","type-post","status-publish","format-standard","hentry","category-unix","tag-salary","tag-sql"],"_links":{"self":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/1030","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1030"}],"version-history":[{"count":1,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/1030\/revisions"}],"predecessor-version":[{"id":1034,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/1030\/revisions\/1034"}],"wp:attachment":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1030"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1030"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}