{"id":1180,"date":"2015-06-04T17:17:40","date_gmt":"2015-06-04T09:17:40","guid":{"rendered":"http:\/\/www.821121.com\/?p=1180"},"modified":"2020-12-18T17:28:53","modified_gmt":"2020-12-18T09:28:53","slug":"oracle-sql%e8%af%ad%e5%8f%a5-%e4%b9%8b-decode%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1180","title":{"rendered":"Oracle SQL\u8bed\u53e5 \u4e4b decode\u51fd\u6570"},"content":{"rendered":"<h1>\u5b9a\u4e49<\/h1>\n<p>decode\u51fd\u6570\u80fd\u591f\u6bd4\u8f83\u8f93\u5165\u7684\u8868\u8fbe\u5f0f\u548c\u641c\u7d22\u5b57\uff0c\u5982\u679c\u5339\u914d\uff0c\u8fd4\u56de\u7ed3\u679c\uff1b\u5982\u679c\u4e0d\u5339\u914d\uff0c\u8fd4\u56dedefault\u503c\uff1b\u5982\u679c\u672a\u5b9a\u4e49default\u503c\uff0c\u5219\u8fd4\u56de\u7a7a\u503c\u3002<\/p>\n<h1>\u8bed\u6cd5<\/h1>\n<p>decode(expr1,expr2,expr3,[expr4])<br \/>\n1\uff09\u5982\u679cexpr1 = expr2,decode\u51fd\u6570\u8fd4\u56deexpr3\u8868\u8fbe\u5f0f\u7684\u503c;<br \/>\n2\uff09\u5982\u679cexpr1 != expr2,decode\u51fd\u6570\u8fd4\u56deexpr4\u8868\u8fbe\u5f0f\u7684\u503c,\u5982\u679cexpr4\u672a\u6307\u5b9a\uff0c\u5219\u8fd4\u56denull\u3002<\/p>\n<h1>\u8fd4\u56de\u503c\u7c7b\u578b<\/h1>\n<p>\u5b57\u7b26\u4e32<\/p>\n<h1>\u4e3e\u4f8b<\/h1>\n<h2>\u573a\u666f1\uff1a\u6307\u5b9a\u9ed8\u8ba4\u503c<\/h2>\n<h3>\u672a\u52a0\u5165\u51fd\u6570<\/h3>\n<pre><code class=\"language-sql\">select * from test<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608283210047.png\" alt=\"file\" \/><\/p>\n<h3>\u52a0\u5165\u51fd\u6570<\/h3>\n<pre><code class=\"language-sql\">select name,decode(score,80,95,90) as score,subject from test<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608283334623.png\" alt=\"file\" \/><\/p>\n<h2>\u573a\u666f2\uff1a\u884c\u8f6c\u5217<\/h2>\n<h3>\u672a\u52a0\u5165\u51fd\u6570<\/h3>\n<pre><code class=\"language-sql\">select * from test<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608283405578.png\" alt=\"file\" \/><\/p>\n<h3>\u52a0\u5165\u51fd\u6570<\/h3>\n<pre><code class=\"language-sql\">select name,\n       decode(subject, &#039;\u6570\u5b66&#039;, score, null) as \u6570\u5b66,\n       decode(subject, &#039;\u82f1\u8bed&#039;, score, null) as \u82f1\u8bed,\n       decode(subject, &#039;\u8bed\u6587&#039;, score, null) as \u8bed\u6587\n  from test<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608283558751.png\" alt=\"file\" \/><br \/>\n\u5c0f\u6280\u5de7\uff1a\u5982\u4f55\u53bb\u9664\u7ed3\u679c\u4e2d\u7684\u7a7a\u503c<\/p>\n<pre><code class=\"language-sql\">select name,\n       sum(decode(subject, &#039;\u6570\u5b66&#039;, score, null)) as \u6570\u5b66,\n       sum(decode(subject, &#039;\u82f1\u8bed&#039;, score, null)) as \u82f1\u8bed,\n       sum(decode(subject, &#039;\u8bed\u6587&#039;, score, null)) as \u8bed\u6587\n  from test\n  group by name<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608283649268.png\" alt=\"file\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b9a\u4e49 decode\u51fd\u6570\u80fd\u591f\u6bd4\u8f83\u8f93\u5165\u7684\u8868\u8fbe\u5f0f\u548c\u641c\u7d22\u5b57<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48],"tags":[],"class_list":["post-1180","post","type-post","status-publish","format-standard","hentry","category-sql"],"_links":{"self":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1180","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1180"}],"version-history":[{"count":1,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1180\/revisions"}],"predecessor-version":[{"id":1186,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1180\/revisions\/1186"}],"wp:attachment":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1180"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}