sql-server - sum COALESCE 0 而不是 null

Question

我不能添加零值而不是空值，这是我的 sql:

 SELECT
                        S.STOCK_ID,
                        S.PRODUCT_NAME,
                        SUM(COALESCE(AMOUNT,0)) AMOUNT,
                        DATEPART(MM,INVOICE_DATE) AY
                    FROM
                        #DSN3_ALIAS#.STOCKS S
                            LEFT OUTER JOIN DAILY_PRODUCT_SALES DPS ON S.STOCK_ID = DPS.PRODUCT_ID
                    WHERE
                        MONTH(INVOICE_DATE) >= #attributes.startdate# AND 
                        MONTH(INVOICE_DATE) < #attributes.finishdate+1#
                    GROUP BY
                        DATEPART(MM,INVOICE_DATE),
                        S.STOCK_ID,
                        S.PRODUCT_NAME
                    ORDER BY
                        S.PRODUCT_NAME

和我的 table :

<cfoutput query="get_sales_total" group="stock_id">
                            <tr height="20" class="color-row">
                                <td>#product_name#</td>
                                <cfoutput group="ay"><td><cfif len(amount)>#amount#<cfelse>0</cfif></td></cfoutput>
                            </tr>
                        </cfoutput>

我想要的结果:

我得到的结果:

谢谢大家的帮助!

+ 编辑:

我已经使用了交叉连接技术，重新编写了sql:

SELECT
                        SUM(COALESCE(AMOUNT,0)) AMOUNT,S.STOCK_ID,S.PRODUCT_NAME,DPS.AY
                    FROM
                        #DSN3_ALIAS#.STOCKS S
                            CROSS JOIN (SELECT DISTINCT <cfif attributes.time_type eq 2>DATEPART(MM,INVOICE_DATE) AY<cfelse>DATEPART(DD,INVOICE_DATE) AY</cfif> 
                            FROM DAILY_PRODUCT_SALES) DPS
                            LEFT OUTER JOIN DAILY_PRODUCT_SALES DP ON S.STOCK_ID = DP.PRODUCT_ID AND 
                            <cfif attributes.time_type eq 2>DATEPART(MM,DP.INVOICE_DATE)<cfelse>DATEPART(DD,DP.INVOICE_DATE)</cfif> = DPS.AY
                    WHERE
                    <cfif attributes.time_type eq 2>
                        MONTH(INVOICE_DATE) >= #attributes.startdate# AND 
                        MONTH(INVOICE_DATE) < #attributes.finishdate+1#
                    <cfelse>
                        MONTH(INVOICE_DATE) = #attributes.startdate#
                    </cfif>
                    <cfif len(trim(attributes.product_cat)) and len(attributes.product_code)>
                        AND S.STOCK_CODE LIKE '#attributes.product_code#%'
                    </cfif>
                    GROUP BY DPS.AY,S.STOCK_ID,S.PRODUCT_NAME
                    ORDER BY DPS.AY,S.STOCK_ID,S.PRODUCT_NAME

结果是:

Answer 1

改用 CASE

SUM(当 A 为空时，则为 0 ELSE A END)