Oracle中的SUM用法讲解

SELECT
AREA_CODE,
SUM (
CASE
WHEN IPTV_NBR IS NULL or IPTV_NBR = '' THEN
0
ELSE
1
END
),
SUM (
CASE
WHEN ACC_NBR IS NULL or ACC_NBR = '' THEN
0
ELSE
1
END
),
COUNT (*)
FROM
GAT_SQMS.GAT_SQMS_BAND_IPTV_VIEW
GROUP BY
AREA_CODE;