{"provider_name":"Hatena Blog","provider_url":"https://hatena.blog","version":"1.0","description":"\u8efd\u304fOracle Label Security(OLS)\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u76ee\u3092\u901a\u3057\u3066\u307f\u305f\u304c\u3001\u4e00\u3064\u8151\u306b\u843d\u3061\u306a\u3044\u70b9\u304c\u3042\u308b\u3002OLS\u306f\u5185\u90e8\u7684\u306b Virtual Private Database (VPD) \u3068\u3044\u3046\u6280\u8853\u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u3089\u3057\u3044\u306e\u3060\u304c\u3001\u3053\u308c\u306f\u884c\u30ec\u30d9\u30eb\u306e\u30a2\u30af\u30bb\u30b9\u5236\u5fa1(\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0)\u306e\u305f\u3081\u306b\u3001\u5f37\u5236\u7684\u306bWHERE\u53e5\u306b\u6761\u4ef6\u3092\u304f\u3063\u3064\u3051\u308b\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30af\u30a8\u30ea\u306e\u5834\u5408\u3001\u3069\u3046\u306a\u308b\u306e\u3060\u308d\u3046\u304b\u3002 SELECT t1.x, t1.y, t2.z FROM t1 LEFT OUTER JOIN t2 ON t1.x = t2.x; (*) t1, t2\u306e\u5b9a\u7fa9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3068\u3059\u308b\u3002 (*) \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u884c\u30e9\u30d9\u30eb\u306e\u2026","url":"https://kaigai.hatenablog.com/entry/20070424/1177343786","width":"100%","height":"190","blog_url":"https://kaigai.hatenablog.com/","blog_title":"KaiGai\u306e\u4ffa\u30e1\u30e2","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkaigai.hatenablog.com%2Fentry%2F20070424%2F1177343786\" title=\"\u7d20\u6734\u306a\u7591\u554f - KaiGai\u306e\u4ffa\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/kaigai/","title":"\u7d20\u6734\u306a\u7591\u554f","image_url":null,"type":"rich","categories":["OSS/Linux"],"author_name":"kaigai","published":"2007-04-24 00:56:26"}