Display %ROWCOUNT value in a select statement - intersystems-cache

Question

How is the result of %ROWCOUNT displayed in the SQL statement.
Example
Select top 10 * from myTable.
I would like the results to have a rowCount for each row returned in the result set
Ex
+----------+--------+---------+
|rowNumber |Column1 |Column2 |
+----------+--------+---------+
|1 |A |B |
|2 |C |D |
+----------+--------+---------+

Answer 1

There are no any simple way to do it. You can add Sql Procedure with this functionality and use it in your SQL statements.
For example, class:
Class Sample.Utils Extends %RegisteredObject
{
ClassMethod RowNumber(Args...) As %Integer [ SqlProc, SqlName = "ROW_NUMBER" ]
{
quit $increment(%rownumber)
}
}
and then, you can use it in this way:
SELECT TOP 10 Sample.ROW_NUMBER(id) rowNumber, id,name,dob
FROM sample.person
ORDER BY ID desc
You will get something like below
+-----------+-------+-------------------+-----------+
|rowNumber |ID |Name |DOB |
+-----------+-------+-------------------+-----------+
|1 |200 |Quigley,Neil I. |12/25/1999 |
|2 |199 |Zevon,Imelda U. |04/22/1955 |
|3 |198 |O'Brien,Frances I. |12/03/1944 |
|4 |197 |Avery,Bart K. |08/20/1933 |
|5 |196 |Ingleman,Angelo F. |04/14/1958 |
|6 |195 |Quilty,Frances O. |09/12/2012 |
|7 |194 |Avery,Susan N. |05/09/1935 |
|8 |193 |Hanson,Violet L. |05/01/1973 |
|9 |192 |Zemaitis,Andrew H. |03/07/1924 |
|10 |191 |Presley,Liza N. |12/27/1978 |
+-----------+-------+-------------------+-----------+

Answer 2

If you are willing to rewrite your query then you can use a view counter to do what you are looking for. Here is a link to the docs.
The short version is you move your query into a FROM clause sub query and use the special field %vid.
SELECT v.%vid AS Row_Counter, Name
FROM (SELECT TOP 10 Name FROM Sample.Person ORDER BY Name) v
Row_Counter Name
1 Adam,Thelma P.
2 Adam,Usha J.
3 Adams,Milhouse A.
4 Allen,Xavier O.
5 Avery,James R.
6 Avery,Kyra G.
7 Bach,Ted J.
8 Bachman,Brian R.
9 Basile,Angelo T.
10 Basile,Chad L.