{"id":55,"date":"2006-11-27T14:53:17","date_gmt":"2006-11-27T05:53:17","guid":{"rendered":"https:\/\/wp-78qb7hnp.pistolfly.jp\/weblog\/2006\/11\/3null.html"},"modified":"2006-11-27T14:53:17","modified_gmt":"2006-11-27T05:53:17","slug":"3null","status":"publish","type":"post","link":"https:\/\/www.pistolfly.com\/weblog\/2006\/11\/3null.html","title":{"rendered":"3\u5024\u8ad6\u7406\u3068NULL"},"content":{"rendered":"<p><a href=\"http:\/\/codezine.jp\/a\/article\/aid\/532.aspx\">http:\/\/codezine.jp\/a\/article\/aid\/532.aspx<\/a><\/p>\n<blockquote><p>\n\u3000\u3057\u304b\u3057\u3001NOT\u306e\u5834\u5408\u306f\u5358\u7d14\u3060\u304b\u3089\u3044\u3044\u3068\u3057\u3066\u3001AND\u3068OR\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u5168\u90e8\u899a\u3048\u308b\u306e\u306f\u306a\u304b\u306a\u304b\u5927\u5909\u3067\u3059\u3002\u305d\u3053\u3067\u30013\u3064\u306e\u771f\u7406\u5024\u306e\u9593\u306b\u6b21\u306e\u3088\u3046\u306a\u512a\u5148\u9806\u4f4d\u304c\u3042\u308b\u3068\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n * AND\u306e\u5834\u5408\uff1a false \uff1e unknown \uff1e true<br \/>\n * OR\u306e\u5834\u5408\u3000\uff1a true \uff1e unknown \uff1e false<br \/>\n\u3000\u5f37\u3044\u65b9\u304c\u5f31\u3044\u65b9\u3092\u5451\u307f\u8fbc\u307f\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u300ctrue AND unknown\u300d\u306a\u3089\u3001unknown\u306e\u65b9\u304c\u5f37\u3044\u306e\u3067\u3001\u7d50\u679c\u3082unknown\u306b\u306a\u308a\u307e\u3059\u3002\u3068\u3053\u308d\u304c\u3001\u300ctrue OR unknown\u300d\u306e\u5834\u5408\u3001\u4eca\u5ea6\u306ftrue\u306e\u65b9\u304c\u5f37\u304f\u306a\u308b\u306e\u3067\u3001\u7d50\u679c\u306ftrue\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u9806\u4f4d\u3092\u899a\u3048\u3066\u304a\u3051\u3070\u30013\u5024\u8ad6\u7406\u6f14\u7b97\u3082\u898b\u901a\u3057\u304c\u3088\u304f\u306a\u308a\u307e\u3059\u3002\u7279\u306b\u3001AND\u306e\u6f14\u7b97\u306bunknown\u304c\u542b\u307e\u308c\u305f\u5834\u5408\u3001\u7d50\u679c\u304c\u7d76\u5bfe\u306btrue\u306b\u306a\u3089\u306a\u3044\u3068\u3044\u3046\u7279\u5fb4\u3092\u3088\u304f\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u5f8c\u3067\u3053\u308c\u304c\u91cd\u8981\u306a\u30ad\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\n<\/p><\/blockquote>\n<p><a href=\"http:\/\/codezine.jp\/a\/article.aspx?aid=532&amp;p=2\">http:\/\/codezine.jp\/a\/article.aspx?aid=532&amp;p=2<\/a><\/p>\n<blockquote><p>\n\t<strong>NOT IN\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u4f7f\u7528\u3055\u308c\u308b\u30c6\u30fc\u30d6\u30eb\u306e\u9078\u629e\u5217\u306bNULL\u304c\u5b58\u5728\u3059\u308b\u5834\u5408<\/strong>\u3001SQL\u5168\u4f53\u306e\u7d50\u679c\u306f\u5e38\u306b\u7a7a\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u6050\u308d\u3057\u3044\u73fe\u8c61\u3067\u3059\u3002<br \/>\n\t\u6b63\u3057\u3044\u7d50\u679c\u3092\u5f97\u308b\u306b\u306f\u3001EXISTS\u8ff0\u8a9e\u3092\u4f7f\u3063\u3066\u66f8\u304d\u307e\u3059\u3002<br \/>\n\tEXISTS\u8ff0\u8a9e\u304c\u7d76\u5bfe\u306bunknown\u3092\u8fd4\u3055\u306a\u3044\u304b\u3089\u3067\u3059\u3002EXISTS\u306f\u3001true\u3068false\u3057\u304b\u8fd4\u3057\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u306b\u3001IN\u3068EXISTS\u306f\u540c\u5024\u5909\u63db\u304c\u53ef\u80fd\u306a\u306e\u306b\u3001NOT IN\u3068NOT EXISTS\u306f\u540c\u5024\u3067\u306f\u306a\u3044\u3068\u3044\u3046\u7d1b\u3089\u308f\u3057\u3044\u72b6\u6cc1\u304c\u751f\u3058\u3066\u3044\u307e\u3059\u3002\n<\/p><\/blockquote>\n<p><a href=\"http:\/\/codezine.jp\/a\/article.aspx?aid=532&amp;p=2\">http:\/\/codezine.jp\/a\/article.aspx?aid=532&amp;p=2<\/a><\/p>\n<blockquote><p>\n\t...\u3053\u308c\u306f\u3001<strong>\u5165\u529b\u304c\u7a7a\u30c6\u30fc\u30d6\u30eb\uff08\u7a7a\u96c6\u5408\uff09\u3060\u3063\u305f\u5834\u5408\u306fNULL\u3092\u8fd4\u3059<\/strong>\u3068\u3044\u3046\u6975\u5024\u95a2\u6570\u306e\u4ed5\u69d8\u306b\u3088\u308a\u307e\u3059\u3002...\u5165\u529b\u304c\u7a7a\u30c6\u30fc\u30d6\u30eb\u3060\u3063\u305f\u5834\u5408\u306bNULL\u3092\u8fd4\u3059\u306e\u306f\u3001\u6975\u5024\u95a2\u6570\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002COUNT\u95a2\u6570\u4ee5\u5916\u306e\u96c6\u7d04\u95a2\u6570\u3082\u305d\u3046\u3067\u3059\u3002\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>http:\/\/codezine.jp\/a\/article\/aid\/532.aspx \u3000\u3057\u304b\u3057\u3001NOT\u306e\u5834\u5408\u306f\u5358\u7d14\u3060\u304b\u3089\u3044\u3044\u3068\u3057\u3066\u3001AND\u3068OR\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u5168\u90e8\u899a\u3048\u308b\u306e\u306f\u306a\u304b\u306a\u304b\u5927\u5909\u3067\u3059\u3002\u305d\u3053\u3067\u30013\u3064\u306e\u771f\u7406\u5024\u306e\u9593\u306b\u6b21\u306e\u3088 &hellip; <a href=\"https:\/\/www.pistolfly.com\/weblog\/2006\/11\/3null.html\" class=\"more-link\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">3\u5024\u8ad6\u7406\u3068NULL<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"","_original_post":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[11],"tags":[],"class_list":["post-55","post","type-post","status-publish","format-standard","hentry","category-sql","ja"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>3\u5024\u8ad6\u7406\u3068NULL - Pistolfly<\/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.pistolfly.com\/weblog\/2006\/11\/3null.html\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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