ROWS(LEFT) and ROWS(RIGHT)

ROWS(LEFT)

ROWS(RIGHT)

The ROWS(LEFT) and ROWS(RIGHT) keywords indicate the parameter being passed to the TRANSFORM function is a record set. These are used in functions where a dataset is being passed, such as COMBINE, ROLLUP, JOIN, DENORMALIZE, and LOOP.

Example:

NormRec := RECORD
  STRING20 thename;
  STRING20 addr;
END;
NamesRec := RECORD
  UNSIGNED1 numRows;
  STRING20 thename;
  DATASET(NormRec) addresses;
END;
NamesTable := DATASET([ {0,'Kevin',[]},{0,'Liz',[]},
                        {0,'Mr Nobody',[]},{0,'Anywhere',[]}],
                      NamesRec);
NormAddrs := DATASET([{'Kevin','10 Malt Lane'},
                      {'Liz','10 Malt Lane'},
                      {'Liz','3 The cottages'},
                      {'Anywhere','Here'},
                      {'Anywhere','There'},
                      {'Anywhere','Near'},
                      {'Anywhere','Far'}],NormRec);
NamesRec DeNormThem(NamesRec L, DATASET(NormRec) R) := TRANSFORM
  SELF.NumRows := COUNT(R);
  SELF.addresses := R;
  SELF := L;
END;
DeNormedRecs := DENORMALIZE(NamesTable, NormAddrs,
                            LEFT.thename = RIGHT.thename,
                            GROUP,
                            DeNormThem(LEFT,ROWS(RIGHT)));
OUTPUT(DeNormedRecs);