Question

我有一张包含以下数据的表格：

licence_number
date_of_birth
organisation

我想在以下地址进行查询：

在organisation1中获取licence_numbers和dobs 许可证号码和数据包都在组织中。

我知道这很难，但是我很难挣扎。

Answer 1

您可以按照license_number和date_of_birth分组，其中组织设置为两个有趣的组织之一，并计算组中有多少个不同的组织。

如果一个组中有两个可能，则有一个命中。

SELECT license_number, date_of_birth
FROM mytable
WHERE organisation IN ('organisation1', 'organisation2')
GROUP BY license_number, date_of_birth
HAVING COUNT(DISTINCT organisation) = 2;

...或者您可以使用INTERSECT;

SELECT license_number, date_of_birth
FROM mytable WHERE organisation = 'organisation1'
INTERSECT
SELECT license_number, date_of_birth
FROM mytable WHERE organisation = 'organisation2'

An SQLfiddle to test both

Answer 2

select 
from t t0
where
    organization = 'organization1'
    and
    exists (
        select 1
        from t
        where
            organization = 'organization2'
            and
            licence_number = t0.licence_number
            and
            date_of_birth = t0.date_of_birth
    )

Answer 3

您可以自行加入许可证编号和日期相同的表格，但组织不是：

SELECT DISTINCT p1.licence_number, p1.date_of_birth
FROM people p1
INNER JOIN people p2
ON p1.licence_number = p2.licence_number AND
p1.date_of_birth = p2.date_of_birth AND
p1.organisation <> p2.organisation

SQL Fiddle here

Answer 4

是JOIN还是1张桌子？

Select 

[licence_number],
[date_of_birth],
[organisation]
From YourTable
Where organisation1 = organisation2

--OR 

Select 

[licence_number],
[date_of_birth],
[organisation]
From YourTable
Where organisation1 IN ('organisation2','organisation3','organisation3')
Order By [licence_number]

SQL SUBQUERY ON SELF

4 个答案: