select row_number() over() as

This is an incomplete SQL statement. It is missing the table or subquery that the row number function will be applied to. The complete statement would be something like: SELECT row_number() OVER (ORDER BY column_name) AS row_num, column1, column2 FROM table_name; This statement would generate a new column called "row_num" that assigns a unique number to each row in the table, based on the order of the values in the "column_name" column. The other columns selected (column1 and column2) could be any other columns from the same table.

怎么优化下面SQL： select distinct bid from ( select row_number() over(order by bid,start_date) as num,bid,start_date,end_date from t1 )a inner join ( select row_number() over(order by bid,start_date) as num,bid,start_date,end_date from t1 )b on a.bid = b.bid where a.num = b.num+1

可以考虑使用CTE（公共表表达式）来优化该SQL语句。具体做法如下： ``` WITH cte AS ( SELECT ROW_NUMBER() OVER (ORDER BY bid, start_date) AS num, bid, start_date, end_date FROM t1 ) SELECT DISTINCT a.bid FROM cte a INNER JOIN cte b ON a.bid = b.bid AND a.num = b.num + 1 ``` 使用公共表表达式的好处是可以避免重复计算，使得SQL语句更加简洁和易于理解。在这个例子中，我们只需要计算一次ROW_NUMBER()函数，然后在CTE中引用它即可。同时，使用WITH语句也可以使得SQL语句更加可读性强，更加易于维护。

SELECT row_number() over

引用\[1\]和\[2\]提供了使用row_number()函数对订单进行编号，并按照订单时间倒序的示例代码。这个函数可以在SELECT语句中使用，通过在ORDER BY子句中指定排序的列和顺序来对结果集进行编号。在这个例子中，使用了ROW_NUMBER() over (order by OrderTime desc) as rowIndex来为每个订单分配一个行号，并按照订单时间倒序排列。引用\[3\]提供了另一种分页的示例代码，使用了OFFSET和FETCH NEXT子句来实现。在这个例子中，使用了OFFSET (pageindex-1) * pagesize rows fetch pagesize rows only来指定要返回的行数和偏移量。请注意，这个语法只适用于SQL Server 2012及以上版本。 #### 引用[.reference_title] - *1* *2* [【SQL】ROW_NUMBER() OVER(partition by 分组列 order by 排序列)用法详解+经典实例](https://blog.csdn.net/m0_38017766/article/details/110520169)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down1,239^v3^insert_chatgpt"}} ] [.reference_item] - *3* [SQL中ROW_NUMBER() OVER()的用法详解](https://blog.csdn.net/qq_46505849/article/details/119929644)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down1,239^v3^insert_chatgpt"}} ] [.reference_item] [ .reference_list ]

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select row_number() over() as

怎么优化下面SQL： select distinct bid from ( select row_number() over(order by bid,start_date) as num,bid,start_date,end_date from t1 )a inner join ( select row_number() over(order by bid,start_date) as num,bid,start_date,end_date from t1 )b on a.bid = b.bid where a.num = b.num+1

SELECT row_number() over

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