{"id":311,"date":"2013-06-03T21:57:45","date_gmt":"2013-06-03T12:57:45","guid":{"rendered":"http:\/\/taitan916.info\/blog\/?p=311"},"modified":"2024-04-20T12:59:54","modified_gmt":"2024-04-20T03:59:54","slug":"post-311","status":"publish","type":"post","link":"https:\/\/taitan916.info\/blog\/archives\/311","title":{"rendered":"MySQL\u3067\u7279\u5b9a\u306e\u5024\u3092\u52a0\u7b97\u3057\u3064\u3064NULL\u5024\u306e\u5834\u5408\u306f0\u306b\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>\u3044\u304f\u3064\u304b\u306e\u30b3\u30fc\u30c9\u306b\u5bfe\u3057\u3066\u6295\u7968\u3092\u884c\u3044\u3001\u305d\u306e\u5408\u8a08\u5024\u3092\u30b9\u30b3\u30a2\u3068\u3057\u3066\u51fa\u3057\u305f\u3044\u3002\u305f\u3060\u3001\u6295\u7968\u3055\u308c\u306a\u304b\u3063\u305f\u308a\u958b\u50ac\u76f4\u5f8c\u306f\u5f53\u71360\u306b\u306a\u308b\u306f\u305a\u3060\u3051\u3069\u3001<span class=\"keyword\">MySQL<\/span>\u3067\u306fNULL\u304c\u8fd4\u3055\u308c\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u7279\u5b9a\u306e\u5024\u3092\u52a0\u7b97\u3057\u3064\u3064NULL\u5024\u306e\u5834\u5408\u306f0\u306b\u3059\u308b\u65b9\u6cd5\u3092\u30e1\u30e2\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">SELECT\r\n    p.code , COALESCE(SUM(g.score),0) AS p_score\r\nFROM\r\n    table_p AS p\r\nLEFT JOIN\r\n    table_g AS g\r\nON p.code = g.code\r\nWHERE p.e_code = xxxxxxxx\r\nGROUP BY p.code<\/pre>\n<p>&nbsp;<\/p>\n<h2>COALECE<\/h2>\n<p><a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/ja\/comparison-operators.html#function_coalesce\" target=\"_blank\" rel=\"noopener\">https:\/\/dev.mysql.com\/doc\/refman\/8.0\/ja\/comparison-operators.html#function_coalesce<\/a><\/p>\n<p>\u30ea\u30b9\u30c8\u306e\u6700\u521d\u306e\u975e NULL \u5024\u3092\u623b\u3059\u304b\u3001\u975e NULL \u5024\u304c\u306a\u3044\u5834\u5408\u306f NULL \u3092\u623b\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u53c2\u8003\u30b5\u30a4\u30c8<\/h2>\n<p><a href=\"http:\/\/detail.chiebukuro.yahoo.co.jp\/qa\/question_detail\/q1014972535\" target=\"_blank\" rel=\"noopener\">http:\/\/detail.chiebukuro.yahoo.co.jp\/qa\/question_detail\/q1014972535<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3044\u304f\u3064\u304b\u306e\u30b3\u30fc\u30c9\u306b\u5bfe\u3057\u3066\u6295\u7968\u3092\u884c\u3044\u3001\u305d\u306e\u5408\u8a08\u5024\u3092\u30b9\u30b3\u30a2\u3068\u3057\u3066\u51fa\u3057\u305f\u3044\u3002\u305f\u3060\u3001\u6295\u7968 ... <\/p>\n","protected":false},"author":1,"featured_media":1072,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-311","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" 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