MySQL多查询返回空值查询

我的查询语句在设置和预算时都返回null。MySQL多查询返回空值查询

但是，如果我删除值11后的所有内容，它的工作原理。

有谁知道最近怎么回事？

SELECT SUM(setup_fee) AS setup, 
     SUM(budget) AS budget 
FROM gdn 
WHERE client = 11 
AND start_date BETWEEN 2017-03-26 AND 2017-04-30 
AND end_date BETWEEN 2017-03-26 AND 2017-04-30

来源

2017-04-05 David

尝试enc用'（）'丢失每个条件 – Swellar

您错过了'group by'子句 – Jens

如果删除'client = 11 AND'，会发生什么？ – Bondt

您的问题既不是由于缺乏组也不周围条件的括号，但你要引用的日期值：

SELECT SUM(setup_fee) AS setup, 
     SUM(budget) AS budget 
FROM gdn 
WHERE client = 11 
     AND start_date BETWEEN '2017-03-26' AND '2017-04-30' 
     AND end_date BETWEEN '2017-03-26' AND '2017-04-30'

您可以看到复制问题的简化版本here

来源

2017-04-05 10:18:53

谢谢！当它允许我时，我会标记为正确 – David

尝试使用下面的查询

SELECT SUM(setup_fee) AS setup, SUM(budget) AS budget FROM gdn WHERE client = 
    11 AND (start_date BETWEEN 2017-03-26 AND 2017-04-30) AND (end_date BETWEEN 
    2017-03-26 AND 2017-04-30) group by client

来源

2017-04-05 10:12:16

没有工作--MySQL返回了一个空的结果集 – David

你能否请求验证客户端的列名？客户端是你的整数列吗？ –

MySQL多查询返回空值查询

回答

相关问题