Does Nodupkey keep first record?
Does Nodupkey keep first record?
NODUPKEY writes only the first observation of each BY group to the new data set TOWNS.
How does PDV work in SAS?
SAS uses the input pointer to read data from the input buffer to the PDV. At the moment, the input pointer is positioned at the beginning of the input buffer. Next, the INPUT statement reads data values from the record in the input buffer according to instructions from the INPUT statement and writes them to the PDV.
What does Noduprecs do in SAS?
PROC SORT’s NODUPRECS (or NODUPREC) (or NODUP) option identifies observations with identical values for all columns are removed from the output data set. The resulting output data saw the removal of the duplicate observations for Brave Heart and Rocky because they have identical data for all columns.
What is the difference between nodupkey and nodup in SAS?
The NODUPKEY option removes duplicate observations where value of a variable listed in BY statement is repeated while NODUP option removes duplicate observations where values in all the variables are repeated (identical observations). The difference between these two options are explained in detail below with SAS codes-
What is the difference between nodup and nodukey in SQL?
The NODUPKEY option removes duplicate observations where value of a variable listed in BY statement is repeated while NODUP option removes duplicate observations where values in all the variables are repeated (identical observations). The NODUPKEY has deleted 5 observations with duplicate values whereas NODUP has not deleted any observations.
How do I get duplicates from a SAS data set?
Use the DUPOUT= option with NODUPKEY (or NODUP) to output duplicates to the specified SAS data set: PROC SORT DATA = readin NODUPKEY DUPOUT= readin1; BY ID; RUN; The output is shown below :
Why does nodup not remove two identical records from a list?
Although ID 3 has two identical records (See observation 5 and 7), NODUP option has not removed them. It is because they are not next to one another in the dataset and SAS only looks at one record back. To fix this issue, sort on all the variables in the dataset READIN.
