WebMar 2, 2024 · 适用于: SQL Server Azure SQL 数据库 Azure SQL 托管实例 Azure Synapse Analytics Analytics Platform System (PDW) 对结果集的输出进行编号。. 具体来说,返回 … Web1:Partition BY 用来分组. 2:Order by 用来排序. 接下来用 row_number() over 进行去重。. 首先用name 进行分组,id进行排序。. 具体SQL 语句如下. SELECT * FROM (. select *,ROW_NUMBER () over (partition by name order by id desc) AS rn from userinfo ) AS u WHERE u.rn=1. 结果如下.
sql - Assigning unique ROW NUMBER() for all the PARTITIONED RECOR…
WebDISTINCT is evaluated last or almost last of all the clauses. Therefore, it can't be used on the same level as ROW_NUMBER to get the results you want. Either use a derived table with … WebMar 27, 2024 · Distinct + rownum 用法. 查询结果会有重复行,rownum是对表中的数据顺序编号,查询时加上rownum之后,每一行的数据都会有一个不同的rownum值,查询结果如下:. 但是,使用select distinct id from table_a 可以达到同样的效果。. 补充:distinct是对select distinct 后面的所有字段 ... ezekiel 41:19
SQL去重的三种方法汇总(distict、group by 和 row_number() over )
WebApr 13, 2024 · ROWNUMBER ( [] [, ] [, ] [, ] ) A table expression where the RANK is computed. If omitted, OrderBy must be explicitly specified. Columns that define how each partition is sorted. If omitted, Relation must be explicitly specified. Defines how to handle BLANK OrderBy values. WebNov 2, 2024 · distinct group by row_number() over() 需求分析 对下表中uid字段去重,并且把去重后所有字段输出。 distinct方法 ditinct方法适合于单字段去重,但是单字段去重还要保留其他字段数据,就无法完成了; distinct对NULL是不进行过滤的,即返回的结果中是包 … WebDec 8, 2024 · The second query has conditions REC_CREATE_DT_KEY = 20241130 and MODEL_ID = 'ABC' in the outer query, while in the first query these are in the inner query.. … hh sankt pauli