摘要: 给定如下数据: id name salary 1 Alice 2000 2 Bob 3000 3 Charlie 2000 4 David 2000 5 Eddie 1500 SELECT * FROM employees ORDER BY salary DESC FETCH FIRST 2 ROW 阅读全文
posted @ 2022-01-20 20:20 zhjh256 阅读(47) 评论(0) 推荐(0) 编辑
摘要: 有个开发写了不带参数的OVER()分析函数,类似如下: SELECT categories_products.category_id, COUNT(*) OVER() AS all_products FROM categories_products; 经查,其用途相当于不带GROUP BY子句的聚合 阅读全文
posted @ 2022-01-20 18:57 zhjh256 阅读(89) 评论(0) 推荐(0) 编辑