小编use*_*952的帖子

如何在ORACLE SQL的PIVOT函数中将NULL替换为0？这是我要编写的查询：

SELECT * 
FROM
(
SELECT DISTINCT
    CUSTOMER_ID AS CUSTOMER_ID,
    CASE  
        WHEN CATEGORY_CODE = '01' THEN 'CAT 01'
        WHEN CATEGORY_CODE = '02' THEN 'CAT 02'
        WHEN CATEGORY_CODE = '03' THEN 'CAT 03'
        ELSE 'OTHER' END AS CATEGORY,
    SUM(ORDERS) AS ORDERS
FROM
    TABLE_01
GROUP BY
    CUSTOMER_ID,
    CASE  
        WHEN CATEGORY_CODE = '01' THEN 'CAT_01'
        WHEN CATEGORY_CODE = '02' THEN 'CAT_02'
        WHEN CATEGORY_CODE = '03' THEN 'CAT_03'
        ELSE 'OTHER' END
)
PIVOT
    (
    SUM(ORDERS)
    FOR CATEGORY IN 
        (
        'CAT_01',
        'CAT_02',
        'CAT_03',
        'OTHER' …