Oracle Group by multiple condition - sql

Question

I had a query to group types with sum of prices
SELECT t.type, sum(t.price) AS TOTAL
FROM table1 t
WHERE t.entry_date = & entryDate
GROUP BY t.type;
It works correctly and returns
+-----------+-----------+
| TYPE | TOTAL |
+-----------+-----------+
| | 741,5 |
| type1 | 108,54 |
| type2 | 216,35 |
+-----------+-----------+
In table some of the rows don't have a type name.
I want to add a case to check if exists add its price to type1 so
I tried something like
SELECT (CASE WHEN t.id = k.orderno AND length(k.invoice_no) < 12
THEN 'type1' ELSE t.type END
) AS TYPE,
SUM(t.price) AS TOTAL
FROM table1 t, table2 k
WHERE t.entry_date = & entryDate
GROUP BY TYPE;
It gives
ora-00937 not a single-group group function
I also tried group by when case but it didn't work either.

Answer 1

Without knowing your table definitions and what the columns are used for it is difficult to answer; however, it could be as simple as:
SELECT COALESCE( t.type, t.price ) AS type,
sum(t.price) AS TOTAL
FROM table1 t
WHERE t.entry_date = &entryDate
GROUP BY
t.type;
Or, if you want to join another table then you want to use a join condition (and, preferably, the ANSI join syntax rather the legacy comma join syntax):
SELECT CASE
WHEN COALESCE( LENGTH(k.invoice_no), 0 ) < 12
THEN 'type1' || t.price
ELSE t.type
END AS TYPE,
SUM(t.price) AS TOTAL
FROM table1 t
LEFT OUTER JOIN table2 k
ON ( t.id = k.orderno )
WHERE t.entry_date = &entryDate
GROUP BY
CASE
WHEN COALESCE( LENGTH(k.invoice_no), 0 ) < 12
THEN 'type1' || t.price
ELSE t.type
END;

Answer 2

You need to use the group by accordingly as follows:
select Case When t.id = k.orderno
and length(k.invoice_no) < 12
THEN 'type1'
ELSE t.type
END AS TYPE,
sum(t.price) as TOTAL
from table1 t, table2 k
where t.entry_date = &entryDate
group by Case When t.id = k.orderno
and length(k.invoice_no) < 12
THEN 'type1'
ELSE t.type
END;