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Top Forums Shell Programming and Scripting Group by and string concatenation Post 302791635 by Yoda on Monday 8th of April 2013 08:14:06 PM
Old 04-08-2013
Code:
awk '
{
        # Check if array indexed by 1st field (A[$1]) is null.
        # If yes, assign value = 2nd field ($2)
        # If no, assign value = previous value (A[$1]) comma (",") 2nd field ($2)
        A[$1] = A[$1] == "" ? $2 : A[$1] "," $2
}
        # END Block
END {
        # For each element in array
        # Print
        for (i in A) {
                print i, A[i]
        }
} ' file

This User Gave Thanks to Yoda For This Post:
 

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END(7)								   SQL Commands 							    END(7)

NAME
END - commit the current transaction SYNOPSIS
END [ WORK | TRANSACTION ] DESCRIPTION
END commits the current transaction. All changes made by the transaction become visible to others and are guaranteed to be durable if a crash occurs. This command is a PostgreSQL extension that is equivalent to COMMIT [commit(7)]. PARAMETERS
WORK TRANSACTION Optional key words. They have no effect. NOTES
Use ROLLBACK [rollback(7)] to abort a transaction. Issuing END when not inside a transaction does no harm, but it will provoke a warning message. EXAMPLES
To commit the current transaction and make all changes permanent: END; COMPATIBILITY
END is a PostgreSQL extension that provides functionality equivalent to COMMIT [commit(7)], which is specified in the SQL standard. SEE ALSO
BEGIN [begin(7)], COMMIT [commit(7)], ROLLBACK [rollback(7)] SQL - Language Statements 2010-05-14 END(7)
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