ABAP CDS 中的透视表/反透视表

Question

Is it possible to do pivot query in ABAP CDS query? Is there a way we can achieve this like what we are always doing in SQL server and MySQL?

Answer 1

No, currently it is not supported natively neither in ABAP CDS nor in HANA.

There are several workarounds you can use to simulate pivot behavior:

1. Pivoting with COUNT and UNION ALL [sample]

    select vendor_id, sum("E1") AS "E1", SUM("E2") AS "E2", SUM("E3") AS "E3" FROM ( select vendor_id, COUNT(NUM) as "E1", 0 AS "E2" , 0 AS "E3" from "ABHISHEAGRAW". WHERE EMP_ID = 'E1' GROUP BY vendor_id union all select vendor_id, 0 AS “E1”, COUNT(NUM) as "E2", 0 AS "E3" from "ABHISHEAGRAW". WHERE EMP_ID = 'E2' GROUP BY vendor_id union all select vendor_id, 0 AS “E1”, 0 as "E2", COUNT(NUM) AS "E3" from "ABHISHEAGRAW". WHERE EMP_ID = 'E3' GROUP BY vendor_id ) GROUP BY vendor_id ORDER BY vendor_id

2. Pivoting with COUNT through CASE [sample]

    select vendor_id, sum("E1") AS "E1", SUM("E2") AS "E2", SUM("E3") AS "E3" FROM ( select vendor_id, CASE (EMP_ID) WHEN 'E1' THEN 1 ELSE 0 END as "E1", CASE (EMP_ID) WHEN 'E2' THEN 1 ELSE 0 END as "E2", CASE (EMP_ID) WHEN 'E3' THEN 1 ELSE 0 END as "E3" from “ABHISHEAGRAW”. )GROUP BY vendor_id ORDER BY vendor_id

3. Pivoting with CASE and grouping [sample]

The given snippets are HANA examples but they can be adapted to ABAP CDS. If you give a MCVE of your case, we can propose you a possible solution.