Selecting lines having same values for first two columns Post: 302748871

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Top Forums Shell Programming and Scripting Selecting lines having same values for first two columns Post 302748871 by pamu on Thursday 27th of December 2012 04:17:58 AM

12-27-2012

Registered User

Quote:

Originally Posted by manojmalhotra13

Thanks for replying so quickly and providing me the desired solution.

I tried the solution provided by RudiC and Sathyaonunix. Both are providing me the solutions. I am looking into the script by Pamu ( I am finding it difficult to understand as my expertise in Unix is not good, so kindly give me some time.)

As regarding query raised by RudiC

(i) if the third column entries are identical, then only one row is to be retained in the original file.

(ii) values cannot be negative.

(iii) the lines without duplicate values to be retained in the orginal file as such.

Thank you once again.

Manoj

Thanks for providing above details.

As per your current requirement I've modified script lit bit.

Now please check.

Code:

awk 'NR==FNR{A[$1,$2]++; B[$1,$2]=B[$1,$2]?B[$1,$2]<$3?$3:B[$1,$2]:$3;next}
{if(A[$1,$2]>1){if(B[$1,$2]==$3){B[$1,$2]=0;print }else{print > "another_file"}}else{print }}' file file

A[$1,$2]++ # Increments the array index for $1 and $2.

B[$1,$2]=B[$1,$2]?B[$1,$2]<$3?$3:B[$1,$2]:$3 # Here we compare is $3 is greater than previous $3 for $1 and $2 and retain max value and assign it to B[$1,$2]

I hope this helps Smilie

pamu

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spi_modifytuple

SPI_MODIFYTUPLE(3)					  PostgreSQL 9.2.7 Documentation					SPI_MODIFYTUPLE(3)

NAME

       SPI_modifytuple - create a row by replacing selected fields of a given row

SYNOPSIS

       HeapTuple SPI_modifytuple(Relation rel, HeapTuple row, int ncols,
				 int * colnum, Datum * values, const char * nulls)

DESCRIPTION

       SPI_modifytuple creates a new row by substituting new values for selected columns, copying the original row's columns at other positions.
       The input row is not modified.

ARGUMENTS

       Relation rel
	   Used only as the source of the row descriptor for the row. (Passing a relation rather than a row descriptor is a misfeature.)

       HeapTuple row
	   row to be modified

       int ncols
	   number of column numbers in the array colnum

       int * colnum
	   array of the numbers of the columns that are to be changed (column numbers start at 1)

       Datum * values
	   new values for the specified columns

       const char * Nulls
	   which new values are null, if any (see SPI_execute_plan for the format)

RETURN VALUE

       new row with modifications, allocated in the upper executor context; NULL only if row is NULL

       On error, SPI_result is set as follows:

       SPI_ERROR_ARGUMENT
	   if rel is NULL, or if row is NULL, or if ncols is less than or equal to 0, or if colnum is NULL, or if values is NULL.

       SPI_ERROR_NOATTRIBUTE
	   if colnum contains an invalid column number (less than or equal to 0 or greater than the number of column in row)

PostgreSQL 9.2.7						    2014-02-17							SPI_MODIFYTUPLE(3)