{"type":"rich","blog_url":"https://bg1.hatenablog.com/","version":"1.0","image_url":null,"height":"190","width":"100%","description":"SUM\u3067\u5408\u8a08\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u51fa\u6765\u308b\u3002https://www.postgresql.jp/docs/9.4/functions-aggregate.html postgresdb1=# SELECT * FROM products; id | name | price | tax | quantity | discount ----+------------+--------+-------+----------+---------- 1 | \u30da\u30f3 | 100.00 | 10.00 | 50 | 5.00 2 | \u30ce\u30fc\u30c8 | 200.00 | 10.00 | 10 | 3.00 3 | \u30da\u30f3\u30b1\u30fc\u30b9\u2026","author_url":"https://blog.hatena.ne.jp/BG1/","categories":["PostgreSQL"],"provider_name":"Hatena Blog","url":"https://bg1.hatenablog.com/entry/2025/07/15/210000","published":"2025-07-15 21:00:00","blog_title":"\u8eca\u8f2a\u306ex\u767a\u660e ~B.G's Blog~","author_name":"BG1","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbg1.hatenablog.com%2Fentry%2F2025%2F07%2F15%2F210000\" title=\"SUM - \u8eca\u8f2a\u306ex\u767a\u660e ~B.G&#39;s Blog~\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_url":"https://hatena.blog","title":"SUM"}