{"id":532,"date":"2026-03-20T14:07:46","date_gmt":"2026-03-20T05:07:46","guid":{"rendered":"https:\/\/se-pg-toolbox.com\/?p=532"},"modified":"2026-03-20T14:07:47","modified_gmt":"2026-03-20T05:07:47","slug":"sql%e3%81%a7%e8%a4%87%e6%95%b0%e3%81%ae%e5%80%a4%e3%81%8b%e3%82%89%e6%9c%80%e5%a4%a7%e5%80%a4%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ab%e3%81%af%e3%81%a9%e3%81%86","status":"publish","type":"post","link":"https:\/\/se-pg-toolbox.com\/?p=532","title":{"rendered":"SQL\u3067\u8907\u6570\u306e\u5024\u304b\u3089\u6700\u5927\u5024\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u306f\u3069\u3046\u3057\u305f\u3089\u3044\u3044\u304b\uff1f"},"content":{"rendered":"\n<p>\u30b9\u30c8\u30a2\u30c9\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u30fc\u3092\u4f5c\u6210\u3059\u308b\u3068\u304d\u306a\u3069\u3001\u8907\u6570\u306e\u5024\u304b\u3089\u6700\u5927\u5024\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<br><br>\u3057\u304b\u3057\u3001\u3069\u306e\u3088\u3046\u306b\u30af\u30a8\u30ea\u3092\u66f8\u3051\u3070\u3044\u3044\u304b\u5206\u304b\u3089\u306a\u3044\u3002<br><br>\u305d\u3046\u3044\u3046\u3053\u3068\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br><br>\u4eca\u56de\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u8907\u6570\u306e\u5024\u304b\u3089\u6700\u5927\u5024\u3092\u53d6\u308c\u3070\u3044\u3044\u304b\u3001\uff12\u7a2e\u985e\u306e\u66f8\u304d\u65b9\u304b\u3089\u8003\u3048\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">GREATEST\u3092\u4f7f\u3046\u65b9\u6cd5<\/h2>\n\n\n\n<p>\u307e\u305a\u306f\u3001GREATEST\u3092\u4f7f\u3046\u65b9\u6cd5\u3092\u8003\u3048\u3066\u307f\u307e\u3059\u3002<br><br>GREATEST\u306fMySQL\u3001PostgreSQL\u3001Oracle\u3068\u4e3b\u8981\u306aSQL\u3067\u306f\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u3001SQL Server\u3082SQL Server2022\u304b\u3089\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br><br>\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7c21\u5358\u306a\u30af\u30a8\u30ea\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\" data-line=\"12\"><code>DECLARE @str1 as char(3);\nDECLARE @str2 as char(3);\nDECLARE @str3 as char(3);\nDECLARE @str4 as char(3);\n\nSELECT @str1 = &#039;200&#039;;\nSELECT @str2 = &#039;300&#039;;\nSELECT @str3 = &#039;500&#039;;\nSELECT @str4 = &#039;400&#039;;\n\n--4\u3064\u306e\u6587\u5b57\u5217\u306e\u6700\u5927\u5024\u3092\u6c42\u3081\u308b\nSELECT GREATEST(@str1, @str2, @str3, @str4)\n\nGO<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u30af\u30a8\u30ea\u3067\u306f\u3001\u6700\u521d\u306b\u5909\u6570\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u306e\u5f8c\u306b\u5909\u6570\u306b\u5024\u3092\u4ee3\u5165\u3057\u3066\u3044\u307e\u3059\u3002<br><br>\u305d\u3057\u3066\u3001GREATEST\u3092\u7528\u3044\u3066\u6700\u5927\u5024\u3092\u6c42\u3081\u3066\u3044\u307e\u3059\u3002<br><br>GREATEST\u306f\u5f15\u6570\u3068\u3057\u3066\u6307\u5b9a\u3055\u308c\u305f\u5024\u304b\u3089\u3001\u6700\u5927\u5024\u3068\u306a\u308b\u3082\u306e\u3092\u62bd\u51fa\u3059\u308b\u3082\u306e\u3067\u3059\u3002<br><br>\u3067\u3059\u306e\u3067\u3001\u3053\u306e\u30b9\u30c8\u30a2\u30c9\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u30fc\u3092\u5b9f\u884c\u3057\u305f\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"532\" height=\"508\" src=\"https:\/\/se-pg-toolbox.com\/wp-content\/uploads\/2026\/03\/image.png\" alt=\"\" class=\"wp-image-533\" \/><\/figure>\n<\/div>\n\n\n<p>@str3\u306b\u8a2d\u5b9a\u3057\u305f\u5024\u3067\u3042\u308b500\u304c\u6700\u3082\u5927\u304d\u3044\u305f\u3081\u3001\u7d50\u679c\u304c500\u3068\u8fd4\u3063\u3066\u304d\u305f\u306e\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">GREATEST\u304c\u4f7f\u3048\u306a\u3044\u5834\u5408\u306e\u4ee3\u66ff\u6848\u306b\u3064\u3044\u3066<\/h2>\n\n\n\n<p>\u3067\u306f\u3001\u53e4\u3044SQL Server\u3092\u4f7f\u3063\u3066\u3044\u308b\u306a\u3069\u3067GREATEST\u304c\u4f7f\u3048\u306a\u3044\u5834\u5408\u306f\u3069\u3046\u3057\u305f\u3089\u3088\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<br><br>\u305d\u306e\u5834\u5408\u306f\u3001GREATEST\u3092\u4f7f\u3048\u306a\u3044\u305f\u3081\u3001\u4ed6\u306e\u65b9\u6cd5\u3092\u8003\u3048\u308b\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u3002<br><br>\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306b\u5024\u3092UNION ALL\u3067\u7d50\u5408\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u610f\u3057\u3001\u305d\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u95a2\u3057\u3066MAX\u95a2\u6570\u3067\u6700\u5927\u5024\u3092\u53d6\u308b\u306a\u3069\u3092\u8003\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>DECLARE @str1 as char(3);\nDECLARE @str2 as char(3);\nDECLARE @str3 as char(3);\nDECLARE @str4 as char(3);\n\nSELECT @str1 = &#039;200&#039;;\nSELECT @str2 = &#039;300&#039;;\nSELECT @str3 = &#039;500&#039;;\nSELECT @str4 = &#039;400&#039;;\n\n--4\u3064\u306e\u6587\u5b57\u5217\u306e\u6700\u5927\u5024\u3092\u6c42\u3081\u308b\nSELECT MAX(val)\nFROM (\n  SELECT @str1 AS val\n  UNION ALL SELECT @str2\n  UNION ALL SELECT @str3\n  UNION ALL SELECT @str4\n) t\n\nGO<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u3053\u3067\u306fUNION ALL\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u6bd4\u8f03\u3059\u308b\u5024\u306e\u6570\u304c\u591a\u304f\u306a\u3051\u308c\u3070\u7279\u306bUNION\u3092\u4f7f\u3063\u3066\u3082\u554f\u984c\u306f\u306a\u3044\u3067\u3059\u3002<br><br>\u3053\u306e\u30af\u30a8\u30ea\u3092\u5b9f\u969b\u306b\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"484\" height=\"573\" src=\"https:\/\/se-pg-toolbox.com\/wp-content\/uploads\/2026\/03\/image-1.png\" alt=\"\" class=\"wp-image-534\" \/><\/figure>\n\n\n\n<p>\u7d50\u679c\u306e\u3068\u3053\u308d\u3092\u898b\u3066\u9802\u304f\u3068\u5206\u304b\u308b\u3088\u3046\u306b\u3001\u3053\u3061\u3089\u3082\u304d\u3061\u3093\u3068\u6700\u5927\u5024\u3067\u3042\u308b500\u3092\u53d6\u5f97\u3057\u3066\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306bGREATEST\u3092\u4f7f\u3048\u306a\u3044\u6642\u306e\u4ee3\u66ff\u7b56\u306f\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u884c\u6570\u304c\u5897\u3048\u3066\u3084\u3084\u4e0d\u4fbf\u306a\u66f8\u304d\u65b9\u306b\u306a\u308b\u306e\u306f\u899a\u609f\u3057\u3066\u304a\u3044\u305f\u65b9\u304c\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u8907\u6570\u306e\u5024\u304b\u3089\u6700\u5927\u5024\u3092\u6c42\u3081\u308b\u65b9\u6cd5\u3068\u3057\u3066GREATEST\u3092\u4f7f\u3046\u65b9\u6cd5\u3068\u3001GREATEST\u304c\u4f7f\u3048\u306a\u3044\u5834\u5408\u306e\u4ee3\u66ff\u3068\u306a\u308b\u65b9\u6cd5\u306e\uff12\u3064\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<br><br>GREATEST\u306f\u4fbf\u5229\u306a\u95a2\u6570\u306a\u306e\u3067\u3001\u4f7f\u3048\u308b\u5834\u5408\u306f\u7a4d\u6975\u7684\u306b\u4f7f\u3063\u3066\u3044\u304f\u3053\u3068\u306b\u8d8a\u3057\u305f\u3053\u3068\u306f\u306a\u3044\u3067\u3059\u304c\u3001SQL Server\u3092\u4f7f\u3063\u3066\u3044\u3066\u3001\u306a\u304a\u304b\u3064\u53e4\u3044\u30b7\u30b9\u30c6\u30e0\u3067\u3042\u308b\u306a\u3069\u3068\u3044\u3046\u3001GREATEST\u304c\u4f7f\u3048\u306a\u3044\u30b1\u30fc\u30b9\u3082\u5b58\u5728\u3059\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<br><br>GREATEST\u304c\u4f7f\u3048\u306a\u3044\u5834\u5408\u3067\u3082\u3001\u304d\u3061\u3093\u3068\u4ee3\u66ff\u7b56\u3092\u899a\u3048\u3066\u304a\u3044\u3066\u5b9f\u88c5\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3068SQL Server\u3092\u4f7f\u3063\u305f\u53e4\u3044\u30b7\u30b9\u30c6\u30e0\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3092\u884c\u3046\u6642\u306b\u5f79\u306b\u7acb\u3061\u307e\u3059\u3002<br><br>\u4e00\u822c\u7684\u306b\u5927\u898f\u6a21\u306a\u30b7\u30b9\u30c6\u30e0\u306fOracle\u306a\u3069\u3092\u4f7f\u3046\u3053\u3068\u304c\u591a\u304f\u3001SQL Server\u306e\u77e5\u8b58\u304c\u4e0d\u8981\u306a\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u304c\u3001\u4e2d\u5c0f\u898f\u6a21\u306e\u30b7\u30b9\u30c6\u30e0\u306e\u5834\u5408\u306f\u53e4\u3044SQL Server\u3092\u5229\u7528\u3057\u3066\u904b\u7528\u3055\u308c\u3066\u3044\u308b\u30b7\u30b9\u30c6\u30e0\u3082\uff10\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u306e\u3067\u3001\u305d\u3093\u306a\u30b7\u30b9\u30c6\u30e0\u306e\u6539\u4fee\u3084\u4fdd\u5b88\u3092\u884c\u3046\u5834\u5408\u306fGREATEST\u3092\u4f7f\u3048\u306a\u3044\u5834\u5408\u306e\u4ee3\u66ff\u7b56\u3092\u4f7f\u3063\u3066\u3001\u540c\u7b49\u306e\u51e6\u7406\u3092\u5b9f\u88c5\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u304a\u3044\u305f\u65b9\u304c\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><span class=\"marker\">\u4eca\u56de\u306e\u8a18\u4e8b\u306f\u3053\u3053\u307e\u3067\u3068\u306a\u308a\u307e\u3059\u3002<br>\u307e\u305f\u6b21\u306e\u8a18\u4e8b\u3067\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30b9\u30c8\u30a2\u30c9\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u30fc\u3092\u4f5c\u6210\u3059\u308b\u3068\u304d\u306a\u3069\u3001\u8907\u6570\u306e\u5024\u304b\u3089\u6700\u5927\u5024\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002 \u3057\u304b\u3057\u3001\u3069\u306e\u3088\u3046\u306b\u30af\u30a8\u30ea\u3092\u66f8\u3051\u3070\u3044\u3044\u304b\u5206\u304b\u3089\u306a\u3044\u3002 \u305d\u3046\u3044\u3046\u3053\u3068\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002 \u4eca\u56de\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u8907\u6570\u306e\u5024\u304b\u3089\u6700\u5927\u5024\u3092\u53d6\u308c\u3070\u3044<\/p>\n","protected":false},"author":2,"featured_media":359,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jin_ogp_image_url":"","_jin_last_featured_id":0,"footnotes":""},"categories":[23],"tags":[24],"class_list":["post-532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database","tag-24"],"_links":{"self":[{"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=\/wp\/v2\/posts\/532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=532"}],"version-history":[{"count":2,"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=\/wp\/v2\/posts\/532\/revisions"}],"predecessor-version":[{"id":536,"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=\/wp\/v2\/posts\/532\/revisions\/536"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=\/wp\/v2\/media\/359"}],"wp:attachment":[{"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/se-pg-toolbox.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}