Case with group by function

Question

I have the following script pulling from the work order module(*where clause omitted):
SELECT status,
COUNT(distinct NUM) countofWO FROM wo
GROUP BY status; Result set is: DS -1; WAPPR-2; INPRG-3;
I have another script that pulls from the equipment module:
select count(*) equipment_count from equipment; with result set 500
I need a sql statement that will provide me with the following results:
equipment_count - 500
sum(countofWO) for all status - 6
sum(countofWO) if status = DS - 1
sum(countofWO) if status = DS and INPRG - 4
sum(countofWO) if status = WAPPR and INPRG - 5;
I started by creating multiple instances of the select statement with different where clauses and UNION'ed them. It took 30 minutes to execute. I tried to use the case statement, but had issues with the group by

Answer 1

Hi,
Welcome to the forum!
Whenever you have a question, it helps to post:
(1) The version of Oracle (and any other relevant software) you're using
(2) A little sample data (just enough to show what the problem is) from all the relevant tables
(3) The results you want from that data
(4) Your best attempt so far (formatted)
(5) The full error message (if any), including line number
Executable SQL statements (like "CREATE TABLE AS ..." or "INSERT ..." statements) are best for (2).
If you can present your problem using commonly available tables (for example, tables in scott schema, or views in the data dictionary), then you can omit (2).
Formatted tabular output is okay for (3). Type these 6 characters:
{code}
(small letters only, inside curly brackets) before and after formatted text, to preserve spacing.
Without the information above, the best I can do is guess.
For the totals on the wo table, this might be what you want:
SELECT       COUNT (DISTINCT num)                              AS all_status
,       COUNT (DISTINCT CASE WHEN status = 'DS'    THEN num END)     AS ds
,       COUNT (DISTINCT CASE WHEN status = 'DS'
                            OR   status = 'INPRG' THEN num END)     AS ds_inprg
,       COUNT (DISTINCT CASE WHEN status = 'WAPPR'
                      OR   status = 'INPRG' THEN num END)     AS wappr_inprg
FROM       wo
;You might use a cross-join to get the data from the equipment table in the same result set. Without the information above, I can't tell.