sql自连接表删除重复的行
I have the following table: 我有以下表格: ╔════════╦════════════╗║ USERID ║ LANGUAGEID ║╠════════╬════════════╣║ 1 ║ 2 ║║ 1 ║ 7...
选择给定列中包含“_”的所有行[重复]
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python pandas:删除列A的重复项,保持列B中具有最高值的行
I have a dataframe with repeat values in column A. I want to drop duplicates, keeping the row with the highest value in column B. 我在A列中有一个重复值的数据框。我想删除...
奇怪问题求指导!DataSet里用SQL语句加行可以,但在DataGridView中追加相同新行,更新到数据库提示主键重复!
数据连接和变量先前定义好的。 SqlCeCommand scCommand = new SqlCeCommand(); scCommand.CommandText = "select * from Pro_Info"; p...
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My pivot query is generating duplicate rows, and i'm blocked. can anyone solve this? 我的透视查询正在生成重复的行,我被阻止了。有谁能解决这个问题? CREATE PROCEDURE [dbo].[test2]AS ...
“完整性约束违反:1062重复项”——但没有重复行。
I'm converting an app from native mysqli calls to PDO. Running into an error when attempting to insert a row into a table with a foreign key constrain...
在列中查找具有重复值的行
I have a table author_data: 我有一个表author_data: author_id | author_name ----------+---------------- 9 | ernest jordan 14 | k moribe 15 ...
从重复结果中选择具有最大日期的行
Note: I am working with SQL 2000. 注意:我正在使用SQL 2000。 I would like to select the row with the MAX date for t2.JobCompletionTime by doing something like ...
如何将重复行添加到R中的数据框?
I currently have an edge list in R that looks something like this: 我目前在R中有一个边缘列表,看起来像这样: From To Start End A B 1/1/2011 1/2/2011A ...
在表中插入多行而不插入重复行
I would like to merge a table that the data comes from 2 differents databases. I operated as described below: 我想合并一个数据来自2个不同数据库的表。我操作如下: 1 – I have do...
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I am working on a query that will collect data from a table and display the data for a report. 我正在处理一个查询,该查询将从表中收集数据并显示报告的数据。 The data looks like thi...
SQL用于选择一列中具有重复值的所有行
I have a users table that has duplicate values in the employee_id column. I need to list all rows with duplicate employee_ids, along with their names....
SQL Server 表中删除重复行
前言 MySQL去重例子https://blog.51cto.com/fengyuzaitu/2687655https://blog.51cto.com/fengyuzaitu/5790968select id,name,age from user a where id...
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I want to repeat the rows of a data.frame, each N times. The result should be a new data.frame (with nrow(new.df) == nrow(old.df) * N) keeping the dat...
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sql里将重复行数据合并为一行数据使用逗号进行分隔
sql里将重复行数据合并为一行,将多行fieldname字段的内容串联起来,用逗号分隔,接下来为大家介绍下详细的实现sql语句,希望对你有所帮助
perl去除重复内容的脚本代码(重复行+数组重复字段)
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This question already has an answer here: 这个问题在这里已有答案: Non-redundant version of expand.grid 5 answers expand.grid的非冗余版本5答案 I need to make ...