Question

我有一个简单的问题，我正在环顾四周，但不能让它适合我。我用当前日期做了一个查询，让我们说tomorow是星期二，但它还没有数据，因为它是未来。它还没有记录。

当我运行查询时，它只显示2个名为total | Date的列它做我说的。但是现在我希望它向我显示0而不是注意，只有2个列。

我确实搜索过COALESCE，但由于某些原因它没有用，它也没有给我任何错误。

SELECT
    SUM(totalExcl) AS total, 
    DATE_FORMAT(date_add, '%W') AS 'Date'  
FROM
    ex.ps_ox_quotation 
WHERE 
    WEEK(date_add) = WEEK (UTC_TIMESTAMP()) 
        AND saleType IN ('IEW' , 'A', 'Project')
        AND DAYOFWEEK(date_add) % 6 > 4 
GROUP BY Date 
ORDER BY 'Date' DESC

我有什么（表）=

| |total | Date

我想要什么（表）=

| |total | Date
     0     Tuesday

今天是星期三所以它是当前日期，这就是它显示的（顺便说一下，这是最新的）我只是展示它：

| |total | Date
    500    Wednesday

Answer 1

试试这个

SELECT
IF(SUM(totalExcl) is NULL,0,SUM(totalExcl)) AS total, 
DAYNAME(date_add) AS 'Date'  
FROM
ex.ps_ox_quotation 
WHERE 
WEEK(date_add) = WEEK (UTC_TIMESTAMP()) 
    AND saleType IN ('IEW' , 'A', 'Project')
    AND DAYOFWEEK(date_add) % 6 > 4 
GROUP BY Date 
ORDER BY 'Date' DESC

或者你可以这样做

SELECT
IF(SUM(totalExcl) is NULL,0,SUM(totalExcl)) AS total, 
IF(DATE_FORMAT(date_add, '%W') is null,DAYNAME(now()),DATE_FORMAT(date_add, '%W')) AS 'Date'  
FROM
ex.ps_ox_quotation 
WHERE 
WEEK(date_add) = WEEK (UTC_TIMESTAMP()) 
    AND saleType IN ('IEW' , 'A', 'Project')
    AND DAYOFWEEK(date_add) % 6 > 4 
GROUP BY Date 
ORDER BY 'Date' DESC

Answer 2

尝试使用 IFNULL ...

SELECT
    IFNULL(SUM(totalExcl),0) AS total, 
    DATE_FORMAT(date_add, '%W') AS 'Date'  
FROM
    ex.ps_ox_quotation 
WHERE 
    WEEK(date_add) = WEEK (UTC_TIMESTAMP()) 
        AND saleType IN ('IEW' , 'A', 'Project')
        AND DAYOFWEEK(date_add) % 6 > 4 
GROUP BY Date 
ORDER BY 'Date' DESC

如果没有找到记录，则sql为零

2 个答案: