Question

这应该很容易，但由于某种原因，我和我的大脑今天不想合作。

我有一个包含sales列的表brick_region。砖块区域始终属于region。现在我想选择sales中属于我选择的特定砖块区域的所有值。我该怎么做？

SELECT *
FROM sales
JOIN brick_regions
ON (brick_regions.id = sales.brick_region)
WHERE sales.date BETWEEN '2014-01-01' AND '2014-03-30'
AND sales.brick_region = 2

但我希望最后一行是这样的：

AND brick_regions.region = [region ID of the brick region with ID 2]

Answer 1

也许尝试使用子查询？

SELECT * FROM sales 
LEFT JOIN brick_regions ON brick_regions.id = sales.brick_region 
WHERE sales.date BETWEEN '2014-01-01' AND '2014-03-30' 
AND brick_regions.region = (SELECT region FROM brick_regions WHERE id = 2);

Answer 2

问题的描述很难:) 因此，您希望根据日期从销售中获取一些行从销售中获取具有所选行的相同brick_region的所有记录（按日期）？

如果是，那怎么样？

select * from sales where sales.brick_region IN(
select brick_region from sales WHERE 
WHERE sales.date BETWEEN '2014-01-01' AND '2014-03-30'
)

Answer 3

砖块区域始终属于区域表

假设您有region表。所以这个查询可能是

SELECT *
FROM sales
JOIN brick_regions
ON (brick_regions.id = sales.brick_region)
JOIN region
ON (brick_regions.region = region.id)
WHERE sales.date BETWEEN '2014-01-01' AND '2014-03-30'
AND brick_regions.region = 2

OR

SELECT *
FROM sales
JOIN brick_regions
ON (brick_regions.id = sales.brick_region)
JOIN region
ON (brick_regions.region = region.id)
WHERE sales.date BETWEEN '2014-01-01' AND '2014-03-30'
AND region.id = 2

根据另一个表中的值获取所有值

3 个答案: