{"author_name":"takuya_1st","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftakuya-1st.hatenablog.jp%2Fentry%2F2013%2F03%2F26%2F111529\" title=\"\u30d5\u30e9\u30b0\u3068 not null \u306e\u5909\u63db   - \u305d\u308c\u30de\u30b0\u3067\uff01\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_name":"Hatena Blog","title":"\u30d5\u30e9\u30b0\u3068 not null \u306e\u5909\u63db  ","width":"100%","version":"1.0","url":"https://takuya-1st.hatenablog.jp/entry/2013/03/26/111529","image_url":null,"published":"2013-03-26 11:15:29","height":"190","categories":[],"blog_title":"\u305d\u308c\u30de\u30b0\u3067\uff01","type":"rich","blog_url":"https://takuya-1st.hatenablog.jp/","author_url":"https://blog.hatena.ne.jp/takuya_1st/","description":"\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u30d5\u30e9\u30b0\u3092\u6301\u305f\u305b\u308b\u3068\u304d\u3001\u3044\u3064\u3082\u8ff7\u3044\u307e\u3059\u3002\u305d\u306e\u30d5\u30e9\u30b0\u307b\u3093\u3068\u3046\u306b\u5fc5\u8981\u304b\uff1f\u3068\u81ea\u554f\u3057\u3066\u3044\u307e\u3059\u3002\u65e2\u8aad\u3068\u304b\u672a\u8aad\u3068\u304b\u3001\u524a\u9664\u3068\u304b\u6709\u52b9\u3068\u304b\u30d5\u30e9\u30b0\u304c\u3044\u3063\u3071\u3044\u3064\u3044\u3066\u308b\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u3089\u306a\u3044\u3088\u3046\u306b\u5fc3\u304c\u3051\u3066\u3044\u307e\u3059\u3002 \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\uff13\u5024\u3068\u304a\u307c\u3048\u307e\u3059 \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\uff13\u5024\u3068\u304a\u307c\u3048\u3066\u304a\u304f\u3068\u6357\u308a\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u306f\u5024\u304c\uff13\u3064\u3042\u308a\u307e\u3059\u3002 true / false / null \u5168\u90e8\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u30ab\u30e9\u30e0\u306b not null \u304c\u66f8\u304b\u308c\u3066\u3066\u305f\u308a\u3057\u3066\u30a2\u30ec\u30fb\u30fb\u30fb is null / is not null \u306e\u5229\u7528 case \u4f7f\u3048\u3070\u3044\u3044\u3068\u601d\u3046\u3093\u3067\u3059\u3088\u30fb select ( case when read_date is null then \u2026"}