在复杂分析中,可以将ROW_NUMBER()与其他窗口函数如SUM()、AVG()等结合使用。例如,计算每个部门的累计薪资并附加行号: SELECTROW_NUMBER()OVER(PARTITIONBYdepartmentORDERBYsalaryDESC)ASrow_num,department,name,salary,SUM(salary)OVER(PARTITIONBYdepartmentORDERBYsalaryDESC)AScumulative_salaryFROMemployees; 1. 2. ...
1、postgresql 查询每组第一个 ROW_NUMBER () OVER (partition by 字段 ORDER BY 字段 DESC) 写法:SELECT ROW_NUMBER () OVER (partition by 字段 ORDER BY 字段 DESC) AS 字段别名 FROM 表名; SELECT * FROM (SELECT *,ROW_NUMBER () OVER (partition by 字段 ORDER BY 字段 DESC) AS 字段别名(group...
3,row_number() OVER()对分组后的数据标注行号,从1开始。 postgres=#SELECTrow_number()OVER(PARTITIONBYsubjectORDERBYscoreDESC),*FROMscores; row_number|id|subject|stu_name|score---+---+---+---+---1|2|Chinese|user2|902|3|Chinese|user3|903|1|Chinese|user1|801|8|English|user2|902|7|...
c:770 #8 0x0000000000749bc6 in exec_simple_query (query_string=0x1becfa0 "select row_number() over() as rownum, id from aa;") at postgres.c:1231 #9 0x000000000074aea2 in PostgresMain (argc=<optimized out>, argv=argv@entry=0x1c16f70, dbname=0x1c16e98 "postgres", username=<...
SELECTid,salesperson,region,amount,ROW_NUMBER()OVER(PARTITIONBYregionORDERBYamountDESC)ASrow_numFROMsales; 1. 2. 3. 结果: 3. 获取分组中第一条记录 通过ROW_NUMBER()和WHERE子句,获取每个区域中金额最高的记录: SELECTid,salesperson,region,amountFROM(SELECTid,salesperson,region,amount,ROW_NUMBER()OVER...
可以使用以下 SQL 语句实现：SELECT product_id, sale_date, quantity, ROW_NUMBER() OVER (PARTITION BY product_id ORDER BY sale_date DESC) AS row_numFROM sales;在这个例子中，我们首先使用 PARTITION BY product_id 对数据进行分组，然后使用 ORDER BY sale_date DESC 对每个分组内的数据按照销售日期...
1、使用ROW_NUMBER()函数 ROW_NUMBER()函数是PostgreSQL中用于生成序号的一种方法,它可以在查询时为每一行数据分配一个唯一的序号。 示例: SELECT ROW_NUMBER() OVER (ORDER BY column1) AS rn, t.* FROM table_name t; 在这个示例中,ROW_NUMBER()函数通过OVER子句指定了排序规则(ORDER BY column1),表示...
PostgreSQL , rownum , Oracle 兼容性 , row_number 窗口 , limit , PPAS , EDB 背景 Oracle ROWNUM是一个虚拟列,每输出一行递增1。 Oracle rownum 通常被用于LIMIT输出记录数。 SELECT ROWNUM, empno, ename, job FROM emp WHERE ROWNUM < 5 ORDER BY ename; rownum | empno | ename | job ---+---...
SELECTd.department_name"部门名称",concat(e.first_name,',',e.last_name)"姓名",e.salary"月薪",ROW_NUMBER()OVER(PARTITIONBYe.department_idORDERBYe.salaryDESC)AS"row_number",RANK()OVER(PARTITIONBYe.department_idORDERBYe.salaryDESC)AS"rank",DENSE_RANK()OVER(PARTITIONBYe.department_idORDERBYe....
PostgreSQL ROW_NUMBER() function and DISTINCT operator The following query uses the ROW_NUMBER() function to assign integers to the distinct prices from the products table. SELECT DISTINCT price, ROW_NUMBER () OVER ( ORDER BY price ) FROM products ORDER BY price; However, the result is not...