{"id":134491,"date":"2024-03-26T07:59:20","date_gmt":"2024-03-25T22:59:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aenullif%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/"},"modified":"2024-04-04T10:15:21","modified_gmt":"2024-04-04T01:15:21","slug":"mysql%e3%81%aenullif%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aenullif%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/","title":{"rendered":"MySQL\u306eNULLIF\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002"},"content":{"rendered":"

MySQL\u306eNULLIF\u95a2\u6570\u306f\u30012\u3064\u306e\u5f0f\u306e\u5024\u304c\u7b49\u3057\u3044\u5834\u5408\u306fNULL\u3092\u8fd4\u3057\u3001\u7b49\u3057\u304f\u306a\u3044\u5834\u5408\u306f\u6700\u521d\u306e\u5f0f\u306e\u5024\u3092\u8fd4\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u4ee5\u4e0b\u306e\u6587\u6cd5\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

IFNULL(expression1, expression2)<\/p>\n

expression1 \u3068 expression2 \u304c\u6bd4\u8f03\u5bfe\u8c61\u306e\u5f0f\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u79c1\u306f\u3068\u3066\u3082\u5e78\u305b\u3060<\/p>\n

NULLIF(10, 10)\u306f\u300110\u304c10\u306b\u7b49\u3057\u3044\u306e\u3067NULL\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n

NULLIF(10,20)\u306710\u304c\u8fd4\u308a\u307e\u3059\u300210\u306f20\u306b\u7b49\u3057\u304f\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n

NULLIF(\u2018abc\u2019, \u2018abc\u2019) \u2013 NULL\u3092\u8fd4\u3057\u307e\u3059\u3002\u306a\u305c\u306a\u3089\u2019abc\u2019\u3068\u2019abc\u2019\u306f\u7b49\u3057\u3044\u304b\u3089\u3067\u3059<\/p>\n

SELECT NULLIF(‘abc’, ‘def’); \u2013 ‘abc’\u306f’def’\u3068\u7b49\u3057\u304f\u306a\u3044\u306e\u3067\u3001’abc’\u304c\u8fd4\u3055\u308c\u308b<\/p>\n

\u5b9f\u4f7f\u7528\u3067\u306f\u3001NULLIF\u95a2\u6570\u306f\u3001\u6bd4\u8f03\u6f14\u7b97\u6642\u306b\u8d77\u3053\u308a\u5f97\u308b\u30bc\u30ed\u9664\u7b97\u3084\u305d\u306e\u4ed6\u306e\u7570\u5e38\u306a\u72b6\u6cc1\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30af\u30a8\u30ea\u7d50\u679c\u304c\u7570\u5e38\u5024\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u3053\u3068\u3092\u907f\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

MySQL\u306eNULLIF\u95a2\u6570\u306f\u30012\u3064\u306e\u5f0f\u306e\u5024\u304c\u7b49\u3057\u3044\u5834\u5408\u306fNULL\u3092\u8fd4\u3057\u3001\u7b49\u3057\u304f\u306a\u3044\u5834\u5408\u306f\u6700\u521d\u306e\u5f0f\u306e\u5024\u3092\u8fd4\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 \u4ee5\u4e0b\u306e\u6587\u6cd5\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002 IFNULL(expression1, expressio […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-134491","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nMySQL\u306eNULLIF\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/mysql\u306enullif\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL\u306eNULLIF\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta property=\"og:description\" content=\"MySQL\u306eNULLIF\u95a2\u6570\u306f\u30012\u3064\u306e\u5f0f\u306e\u5024\u304c\u7b49\u3057\u3044\u5834\u5408\u306fNULL\u3092\u8fd4\u3057\u3001\u7b49\u3057\u304f\u306a\u3044\u5834\u5408\u306f\u6700\u521d\u306e\u5f0f\u306e\u5024\u3092\u8fd4\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 \u4ee5\u4e0b\u306e\u6587\u6cd5\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002 IFNULL(expression1, expressio […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/mysql\u306enullif\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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