{"id":2988,"date":"2021-07-17T22:28:16","date_gmt":"2021-07-17T13:28:16","guid":{"rendered":"https:\/\/obenkyolab.com\/?p=2988"},"modified":"2022-10-12T22:41:07","modified_gmt":"2022-10-12T13:41:07","slug":"%e3%80%90postgresql%e3%80%91lag-lead%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/obenkyolab.com\/?p=2988","title":{"rendered":"\u3010PostgreSQL\u3011\u524d\u5f8c\u306e\u884c\u3092\u53d6\u5f97\u3067\u304d\u308bLAG LEAD\u95a2\u6570\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#%E6%A6%82%E8%A6%81\" >\u6982\u8981<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#%E7%92%B0%E5%A2%83\" >\u74b0\u5883<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#%E6%BA%96%E5%82%99\" >\u6e96\u5099<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#LAG_LEAD%E3%81%AE%E4%BD%BF%E3%81%84%E6%96%B9\" >LAG(), LEAD()\u306e\u4f7f\u3044\u65b9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#SQL%E4%BE%8B\" >SQL\u4f8b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#%E7%B5%90%E6%9E%9C\" >\u7d50\u679c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#SQL%E4%BE%8B-2\" >SQL\u4f8b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#%E7%B5%90%E6%9E%9C-2\" >\u7d50\u679c<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#%E4%BE%BF%E5%88%A9%E3%81%AA%E4%BE%8B\" >\u4fbf\u5229\u306a\u4f8b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#SQL%E4%BE%8B-3\" >SQL\u4f8b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/obenkyolab.com\/?p=2988\/#%E7%B5%90%E6%9E%9C-3\" >\u7d50\u679c<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A6%82%E8%A6%81\"><\/span>\u6982\u8981<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>PostgreSQL\u3067\u4f7f\u7528\u3067\u304d\u308b\u30a6\u30a3\u30f3\u30c9\u30a6\u95a2\u6570\u306e\u4e2d\u306bLAG\u3068LEAD\u95a2\u6570\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u6307\u5b9a\u3057\u305f\u9805\u76ee\u3092\u884c\u65b9\u5411\u306b\u305a\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4eca\u56de\u306f\u3053\u306eLAG,LEAD\u95a2\u6570\u306e\u5177\u4f53\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u30e1\u30e2\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%92%B0%E5%A2%83\"><\/span>\u74b0\u5883<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>PostgreSQL 11.5<\/p>\n\n\n\n<p>\u3000\u3000<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%BA%96%E5%82%99\"><\/span>\u6e96\u5099<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u307e\u305a\u306fPostgreSQL\u306b\u9069\u5f53\u306a\u30c6\u30b9\u30c8\u7528\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u30c7\u30fc\u30bf\u3092\u7528\u610f\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306bSQL\u306e\u4f8b\u3092\u8f09\u305b\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>CREATE TABLE lag_lead_test(\n\tnum INTEGER\n);\n\nINSERT INTO lag_lead_test\nVALUES\n\t(1)\n\t,(2)\n\t,(3)\n\t,(4)\n\t,(5)\n\t,(6)\n\t,(7)\n\t,(8)\n\t,(9)\n\t,(10)<\/code><\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>\u30c6\u30fc\u30d6\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306fWITH\u53e5\u3092\u4f7f\u3063\u3066\u30af\u30a8\u30ea\u3067\u751f\u6210\u3057\u3066\u3082\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>WITH lag_lead_test AS (\nSELECT\n\t*\nFROM\n\t(\n\tVALUES\n\t\t(1)\n\t\t,(2)\n\t\t,(3)\n\t\t,(4)\n\t\t,(5)\n\t\t,(6)\n\t\t,(7)\n\t\t,(8)\n\t\t,(9)\n\t\t,(10)\n\t) col(num)\n)<\/code><\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"LAG_LEAD%E3%81%AE%E4%BD%BF%E3%81%84%E6%96%B9\"><\/span>LAG(), LEAD()\u306e\u4f7f\u3044\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u307e\u305a\u306f\u4e00\u756a\u30b7\u30f3\u30d7\u30eb\u306a\u5f15\u6570\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u4f7f\u3046\u5834\u5408\u3067\u3059\u3002\u5f15\u6570\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u3001LAG\u3067\u306f\u6307\u5b9a\u3057\u305f\u9805\u76ee\u304c\u4e00\u884c\u4e0b\u306b\u305a\u308c\u3001LEAD\u306f\u4e00\u884c\u4e0a\u306b\u305a\u308c\u307e\u3059\u3002\u307e\u305f\u3001\u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3057\u306a\u3044\u7b87\u6240\u306fNULL\u304c\u5165\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\u3068\u3057\u3066\u306f\u3001LAG\u3068LEAD\u306e\u5f15\u6570\u306b\u9805\u76ee\u3092\u5165\u308c\u3001OVER\u53e5\u3067\u4e26\u3073\u66ff\u3048\u9806\u3092\u5165\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>LAG(\u9805\u76ee)\u3000OVER(ORDER BY \u9805\u76ee)<\/p>\n\n\n\n<p>LEAD(\u9805\u76ee)\u3000OVER(ORDER BY \u9805\u76ee)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SQL%E4%BE%8B\"><\/span>SQL\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT\n\t*\n\t,LAG(num) OVER(ORDER BY num) as lag\n\t,LEAD(num) OVER(ORDER BY num) as lead\nFROM lag_lead_test<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%B5%90%E6%9E%9C\"><\/span><strong>\u7d50\u679c<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>num<\/td><td>lag<\/td><td>lead<\/td><\/tr><tr><td>1<\/td><td><\/td><td>2<\/td><\/tr><tr><td>2<\/td><td>1<\/td><td>3<\/td><\/tr><tr><td>3<\/td><td>2<\/td><td>4<\/td><\/tr><tr><td>4<\/td><td>3<\/td><td>5<\/td><\/tr><tr><td>5<\/td><td>4<\/td><td>6<\/td><\/tr><tr><td>6<\/td><td>5<\/td><td>7<\/td><\/tr><tr><td>7<\/td><td>6<\/td><td>8<\/td><\/tr><tr><td>8<\/td><td>7<\/td><td>9<\/td><\/tr><tr><td>9<\/td><td>8<\/td><td>10<\/td><\/tr><tr><td>10<\/td><td>9<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u6b21\u306b\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u3067\u3059\u3002<\/p>\n\n\n\n<p>LAG, LEAD\u306b<strong>\u305a\u3089\u3059\u884c\u6570<\/strong>\u3068<strong>\u30c7\u30fc\u30bf\u304c\u306a\u3044\u5834\u5408\u306e\u88dc\u9593\u5024<\/strong>\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>LAG(\u9805\u76ee,\u305a\u3089\u3059\u884c\u6570,\u88dc\u9593\u5024)\u3000OVER(ORDER BY \u9805\u76ee)<\/p>\n\n\n\n<p>LEAD(\u9805\u76ee,\u305a\u3089\u3059\u884c\u6570,\u88dc\u9593\u5024)\u3000OVER(ORDER BY \u9805\u76ee)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SQL%E4%BE%8B-2\"><\/span>SQL\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT\n\t*\n\t,lag(num,2,0) OVER(ORDER BY num) as lag\n\t,lead(num,2,0) OVER(ORDER BY num) as lead\nFROM lag_lead_test<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%B5%90%E6%9E%9C-2\"><\/span><strong>\u7d50\u679c<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>num<\/td><td>lag<\/td><td>lead<\/td><\/tr><tr><td>1<\/td><td><span class=\"has-inline-color has-vivid-red-color\"><strong>0<\/strong><\/span><\/td><td>3<\/td><\/tr><tr><td>2<\/td><td><span class=\"has-inline-color has-vivid-red-color\"><strong>0<\/strong><\/span><\/td><td>4<\/td><\/tr><tr><td>3<\/td><td>1<\/td><td>5<\/td><\/tr><tr><td>4<\/td><td>2<\/td><td>6<\/td><\/tr><tr><td>5<\/td><td>3<\/td><td>7<\/td><\/tr><tr><td>6<\/td><td>4<\/td><td>8<\/td><\/tr><tr><td>7<\/td><td>5<\/td><td>9<\/td><\/tr><tr><td>8<\/td><td>6<\/td><td>10<\/td><\/tr><tr><td>9<\/td><td>7<\/td><td><span class=\"has-inline-color has-vivid-red-color\"><strong>0<\/strong><\/span><\/td><\/tr><tr><td>10<\/td><td>8<\/td><td><span class=\"has-inline-color has-vivid-red-color\"><strong>0<\/strong><\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u8d64\u5b57\u306e\u90e8\u5206\u304c\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6307\u5b9a\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u3068\u306e\u9055\u3044\u306e\u7b87\u6240\u3067\u3059\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BE%BF%E5%88%A9%E3%81%AA%E4%BE%8B\"><\/span>\u4fbf\u5229\u306a\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u6642\u7cfb\u5217\u30c7\u30fc\u30bf\u306e\u5834\u5408\u306a\u3069\u306b\u3001\u6642\u523b\u5dee\u5206\u306a\u3069\u304c\u53d6\u308c\u308b\u305f\u3081\u4fbf\u5229\u3067\u3059<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SQL%E4%BE%8B-3\"><\/span>SQL\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>WITH time_lead_test AS (\nSELECT\n\t*\nFROM\n\t(\n\tVALUES\n\t\t(&#39;2021\/7\/17 11:00:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:02:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:05:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:10:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:11:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:18:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:20:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:27:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:35:00&#39;)\n\t\t,(&#39;2021\/7\/17 11:40:00&#39;)\n\t) col(datetime)\n)\nSELECT\n\tdatetime\n\t,lead(datetime) OVER(ORDER BY datetime) AS lead\n\t,CAST(lead(datetime) OVER(ORDER BY datetime) AS TIMESTAMP)-CAST(datetime AS TIMESTAMP) AS timespan\nFROM time_lead_test<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%B5%90%E6%9E%9C-3\"><\/span>\u7d50\u679c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>datetime<\/td><td>lead<\/td><td>timespan<\/td><\/tr><tr><td>2021\/7\/17 11:00<\/td><td>2021\/7\/17 11:02<\/td><td>0:02:00<\/td><\/tr><tr><td>2021\/7\/17 11:02<\/td><td>2021\/7\/17 11:05<\/td><td>0:03:00<\/td><\/tr><tr><td>2021\/7\/17 11:05<\/td><td>2021\/7\/17 11:10<\/td><td>0:05:00<\/td><\/tr><tr><td>2021\/7\/17 11:10<\/td><td>2021\/7\/17 11:11<\/td><td>0:01:00<\/td><\/tr><tr><td>2021\/7\/17 11:11<\/td><td>2021\/7\/17 11:18<\/td><td>0:07:00<\/td><\/tr><tr><td>2021\/7\/17 11:18<\/td><td>2021\/7\/17 11:20<\/td><td>0:02:00<\/td><\/tr><tr><td>2021\/7\/17 11:20<\/td><td>2021\/7\/17 11:27<\/td><td>0:07:00<\/td><\/tr><tr><td>2021\/7\/17 11:27<\/td><td>2021\/7\/17 11:35<\/td><td>0:08:00<\/td><\/tr><tr><td>2021\/7\/17 11:35<\/td><td>2021\/7\/17 11:40<\/td><td>0:05:00<\/td><\/tr><tr><td>2021\/7\/17 11:40<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>PostgreSQL\u3092\u4e00\u304b\u3089\u52c9\u5f37\u3059\u308b\u306b\u306f\u30b3\u30c1\u30e9\u304c\u304a\u3059\u3059\u3081\u3067\u3059<\/p>\n\n\n\n<iframe style=\"width:120px;height:240px;\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" frameborder=\"0\" src=\"https:\/\/rcm-fe.amazon-adsystem.com\/e\/cm?ref=tf_til&amp;t=sebone0f-22&amp;m=amazon&amp;o=9&amp;p=8&amp;l=as1&amp;IS2=1&amp;detail=1&amp;asins=4798160431&amp;linkId=acff604846f4762e68a8025575ce4a0c&amp;bc1=000000&amp;lt1=_blank&amp;fc1=333333&amp;lc1=0066c0&amp;bg1=ffffff&amp;f=ifr\">\n    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