{"id":7882,"date":"2024-03-14T23:04:50","date_gmt":"2024-03-14T14:04:50","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e3%81%a7%e3%81%aecoalesce%e9%96%a2%e6%95%b0%e3%81%ae%e5%bd%b9%e5%89%b2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2025-08-03T17:03:37","modified_gmt":"2025-08-03T08:03:37","slug":"sql%e3%81%a7%e3%81%aecoalesce%e9%96%a2%e6%95%b0%e3%81%ae%e5%bd%b9%e5%89%b2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e3%81%a7%e3%81%aecoalesce%e9%96%a2%e6%95%b0%e3%81%ae%e5%bd%b9%e5%89%b2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"SQL COALESCE\u95a2\u6570\u3068\u306f\uff1f\u57fa\u672c\u3068\u6d3b\u7528\u4f8b\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac"},"content":{"rendered":"

COALESCE \u95a2\u6570\u306f\u3001SQL\u3067\u4f7f\u7528\u3055\u308c\u308b\u95a2\u6570\u3067\u3042\u308a\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30ea\u30b9\u30c8\u306e\u4e2d\u3067\u6700\u521d\u306eNULL\u3067\u306a\u3044\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u30d1\u30e9\u30e1\u30fc\u30bf\u30ea\u30b9\u30c8\u306e\u3059\u3079\u3066\u306e\u5024\u304cNULL\u306e\u5834\u5408\u3001COALESCE \u95a2\u6570\u306fNULL\u3092\u8fd4\u3057\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n

COALESCE(value1, value2, ...)\r\n<\/code><\/pre>\n
    \n
  1. value1\u3001value2\u306a\u3069\uff1a\u78ba\u8a8d\u3059\u308b\u5024\u306e\u30ea\u30b9\u30c8\u3002<\/li>\n<\/ol>\n
    COALESCE \u95a2\u6570\u306e\u4e3b\u306a\u5f79\u5272\u306f\u3001SQL\u30af\u30a8\u30ea\u306b\u304a\u3051\u308bNULL\u5024\u306e\u51e6\u7406\u3092\u7c21\u7565\u5316\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u5b9f\u969b\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066\u3001\u8907\u6570\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304b\u3089\u6700\u521d\u306eNULL\u4ee5\u5916\u306e\u5024\u3092\u9078\u629e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001COALESCE \u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30ec\u30dd\u30fc\u30c8\u306e\u4f5c\u6210\u3084\u30c7\u30fc\u30bf\u5206\u6790\u3092\u884c\u3046\u969b\u306b\u3001\u9867\u5ba2\u306e\u9023\u7d61\u5148\u96fb\u8a71\u756a\u53f7\u3092\u8868\u793a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304c\u3001\u8907\u6570\u306e\u96fb\u8a71\u756a\u53f7\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u3042\u308a\u3001\u305d\u308c\u3089\u306e\u4e00\u90e8\u304c\u7a7a\u6b04\u306e\u5834\u5408\u3001COALESCE \u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u512a\u5148\u3059\u308b\u9023\u7d61\u5148\u96fb\u8a71\u756a\u53f7\u3092\u6c7a\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \u4f8b\u3048\u3070\u3001\u30d5\u30a3\u30fc\u30eb\u30c9phone1\u3001phone2\u3001\u304a\u3088\u3073phone3\u3092\u542b\u3080Customers\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002\u5404\u9867\u5ba2\u306e\u9023\u7d61\u5148\u96fb\u8a71\u756a\u53f7\u3092\u53d6\u5f97\u3057\u3001NULL\u3067\u306a\u3044\u96fb\u8a71\u756a\u53f7\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u512a\u5148\u7684\u306b\u9078\u629e\u3057\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306eSQL\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
    SELECT customer_name, COALESCE(phone1, phone2, phone3) AS contact_phone\r\nFROM Customers;\r\n<\/code><\/pre>\n
    \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u9867\u5ba2\u306e\u540d\u524d\u3068\u512a\u5148\u9023\u7d61\u5148\u96fb\u8a71\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\u3002phone1\u304c\u7a7a\u306e\u5834\u5408\u306f\u3001\u81ea\u52d5\u7684\u306bphone2\u3092\u9078\u629e\u3057\u3001\u305d\u308c\u4ee5\u964d\u3082\u540c\u69d8\u306b\u7d9a\u304d\u307e\u3059\u3002<\/p>\n
    \u8981\u8bf4\u5230\u5e95\uff0cCOALESCE\u51fd\u6570\u662fSQL\u67e5\u8be2\u4e2d\u975e\u5e38\u6709\u7528\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u5904\u7406NULL\u503c\u5e76\u7b80\u5316\u903b\u8f91\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    COALESCE \u95a2\u6570\u306f\u3001SQL\u3067\u4f7f\u7528\u3055\u308c\u308b\u95a2\u6570\u3067\u3042\u308a\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30ea\u30b9\u30c8\u306e\u4e2d\u3067\u6700\u521d\u306eNULL\u3067\u306a\u3044\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u30d1\u30e9\u30e1\u30fc\u30bf\u30ea\u30b9\u30c8\u306e\u3059\u3079\u3066\u306e\u5024\u304cNULL\u306e\u5834\u5408\u3001COALESCE \u95a2\u6570\u306fNULL\u3092\u8fd4\u3057\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[953,117,1419,119,688,14,407],"class_list":["post-7882","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-coalesce","tag-mysql","tag-postgresql","tag-sql","tag-sql-server","tag-14","tag-407"],"yoast_head":"\nSQL COALESCE\u95a2\u6570\u3068\u306f\uff1f\u57fa\u672c\u3068\u6d3b\u7528\u4f8b\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac - 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