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python - Replacing Header with Top Row - Stack Overflow Header refer to the Row number (s) to use as the column names Make no mistake, the row number is not the df but from the excel file (0 is the first row, 1 is the second and so on) This way, you will get the column name you want and won't have to write additional codes or create new df Good thing is, it drops the replaced row
sql - How to select only the first rows for each unique value of a . . . In the table, one customer like John Smith can have multiple addresses I need the SELECT query for this table to return only first row found where there are duplicates in 'CName' For this table it should return all rows except the 3rd (or 1st - any of those two addresses are okay but only one can be returned) Is there a keyword I can add to the SELECT query to filter based on whether the
Pandas: Get first row value of a given column - Stack Overflow If you select by column first, a view can be returned (which is quicker than returning a copy) and the original dtype is preserved In contrast, if you select by row first, and if the DataFrame has columns of different dtypes, then Pandas copies the data into a new Series of object dtype So selecting columns is a bit faster than selecting rows
sql - Best way to get 1st record per partition: FIRST_VALUE vs ROW . . . SELECT * FROM ( SELECT a,b,c, ROW_NUMBER() OVER ( PARTITION by a, b ORDER BY date DESC) as row_num FROM T ) WHERE row_num =1 But it probably does extra work behind the scene - I need only 1st row per partition Approach #2 using FIRST_VALUE () Since FIRST_VALUE () returns expression let pack concatenate a,b,c using some separator into single expression, e g :
How to get First and Last record from a sql query? In SQL Server, if you have a table with columns timestamp and action, your first query generates one row for every row in events On the first row, created_dt is the first timestamp as expected, but last_update_dt is always equal to created_dt That is, it's the last value seen to that point in the data retrieval Perhaps PostGreSQL is different
Select first row in each GROUP BY group? - Stack Overflow I'd like to select the first row of each set of rows grouped with a GROUP BY Specifically, if I've got a purchases table that looks like this: SELECT * FROM purchases; My Output: id customer tota
use first row data as column names in r - Stack Overflow Take a step back, when you read your data use skip=1 in read table to miss out the first line entirely This should make life a bit easier when you're cleaning data, particularly for data type This is key as your problem stems from your data being encoded as factor You can then read in your column names separately with nrows=1 in read table