group [-[no]parallel] <key> [<key> ...] [<aggcol> ...]
Calculates aggregate functions on groups of rows.
This does the same job as a
SELECT ... GROUP BY statement
with aggregate functions in ADQL/SQL.
The functionality is identical to that of the
and the meaning and syntax of the
<aggcol> words are identical too,
except that the
<aggcol> delimiter character
is an at sign ("
rather than a semicolon ("
so a group entry count can be added for instance using
are distinguished by the fact that they contain
at least one delimiter ("
for a full explanation of the syntax and functionality.
The syntax here is rather cramped,
so in many cases it will be more comfortable to use
but this filter is provided for cases where that may be