Help with CASE

Question

Hello people.
TABLE PHONECALLS FIELDS: EMP_ID, TELNO, COST, TYPE
TYPE can be DATA or VOICE
1 EMP_ID owns more than 1 TELNO
I need a report with the following columns:
EMP_ID, TELNO, VOICE_COST, DATA_COST
I need something like:
SELECT EMP_ID , TELNO, SUM(COST),
SUM(CASE COST WHEN TYPE = DATE THEN ...... END) AS VOICE,
SUM(CASE COST WHEN TYPE = VOICE ...... END) AS DATA
FROM PHONECALLS
GROUP BY EMP_ID, TELNO
ORDER BY EMP_ID ASC;Thank you in advance.

Answer 1

Something like this?
SELECT EMP_ID , TELNO, SUM(COST),
SUM(CASE TYPE WHEN 'DATE' THEN COST END) AS VOICE,
SUM(CASE TYPE WHEN 'VOICE' THEN COST END) AS DATA
FROM PHONECALLS
GROUP BY EMP_ID, TELNO
ORDER BY EMP_ID ASC;Or the alternative way of using CASE:
SELECT EMP_ID , TELNO, SUM(COST),
SUM(CASE WHEN TYPE = 'DATE' THEN COST END) AS VOICE,
SUM(CASE WHEN TYPE = 'VOICE' THEN COST END) AS DATA
FROM PHONECALLS
GROUP BY EMP_ID, TELNO
ORDER BY EMP_ID ASC;The first use of CASE is simple - the other can have as complex expressions as needed ;-)