{"description":"SQL\u306e\u901f\u5ea6\u30a2\u30c3\u30d7\u306e\u8a71\u3067\u3001DISTINCT\u3092\u4f7f\u3063\u3066\u91cd\u8907\u6392\u9664\u3059\u308b\u306e\u306f\u9045\u3044\u306e\u3067\u3001EXISTS\u3092\u4f7f\u3048\u3001\u3068\u3044\u3046\u8a71\u3092\u805e\u3044\u3066\u77e5\u3063\u3066\u306f\u3044\u305f\u306e\u3060\u3051\u3069\u3001\u306a\u3093\u3067EXISTS\u3092\u4f7f\u3046\u3068\u91cd\u8907\u6392\u9664\u3067\u304d\u308b\u306e\u304b\u5206\u3089\u306a\u304b\u3063\u305f\u3002 \u3069\u3046\u3084\u3089\u3001\u3053\u3093\u306a\u611f\u3058\u3002\u9867\u5ba2\u30de\u30b9\u30bf A B C \u5546\u54c1\u30de\u30b9\u30bf X Y Z \u3068\u3042\u308b\u3068\u304d\u3001 \u8ca9\u58f2\u30c6\u30fc\u30d6\u30eb\u304c A-X A-Y A-X B-Y B-Z B-Z \u3068\u3042\u308b\u3068\u304d\u3001 \u8ca9\u58f2\u30c6\u30fc\u30d6\u30eb\u306e\u3001\u4e00\u56de\u3067\u3082\u58f2\u308c\u305f\u3053\u3068\u306e\u3042\u308b\u5546\u54c1\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u91cd\u8907\u6392\u9664\u3059\u308b\u5834\u5408\u3001SELECT DISTINCT \u5546\u54c1 FROM \u8ca9\u58f2\u30c6\u30fc\u30d6\u30eb \u3063\u3066\u3001\u611f\u3058\u3067\u3084\u308b\u307b\u304b\u306b\u3001 SELECT \u5546\u54c1 FROM \u5546\u54c1\u30de\u30b9\u30bf WHERE EXISTS (SELEC\u2026","provider_url":"https://hatena.blog","blog_url":"https://annin102.hatenadiary.jp/","url":"https://annin102.hatenadiary.jp/entry/20060908/1157734624","width":"100%","image_url":null,"provider_name":"Hatena Blog","published":"2006-09-08 01:57:04","author_name":"annin102","blog_title":"\u3042\u3093\u306b\u3093\u306b\u3063\u304d\u3002","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fannin102.hatenadiary.jp%2Fentry%2F20060908%2F1157734624\" title=\" DISTINCT\u306f\u99c4\u76ee\u3060\u3001EXISTS\u3092\u4f7f\u3046\u306e\u3060\u3002 - \u3042\u3093\u306b\u3093\u306b\u3063\u304d\u3002\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","type":"rich","height":"190","categories":["\u30d7\u30ed\u30b0\u30e9\u30e0\u95a2\u9023\u30cd\u30bf"],"title":" DISTINCT\u306f\u99c4\u76ee\u3060\u3001EXISTS\u3092\u4f7f\u3046\u306e\u3060\u3002","version":"1.0","author_url":"https://blog.hatena.ne.jp/annin102/"}