Row – Reduce to exactly one row
Row, Target table [, Source table [, Filter instruction]]
This function is only intended for rare special cases:
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If, during generation of a new table, the term 'Row' is used (or Record) instead of the term 'Table', once the target table had been generated, a row is selected and the table is reduced to this one row
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Since the table now only contains one row, no further filtering can be done with this table