Question

我在Patient表中有PatientUid主键，而且还有一些表，例如Patient Address，Contact Info，----我在其中使用它作为外键。我想在我的数据库中的表中搜索一个特定PatientUid的出现

Answer 1

如果我的理解是正确的：
查找一个子表（PatientAddress）的No_of_Occurences

select PatientUID,count(PatientUID) as No_of_Occurences
from PatientAddress
group by PatientUID

同样适用于所有子表（ContactInfo）

然后使用UNION ALL操作符

来控制所有内容

select PatientUID,count(PatientUID) as No_of_Occurences
from PatientAddress
group by PatientUID
union all
select PatientUID,count(PatientUID) as No_of_Occurences
from ContactInfo
group by PatientUID

然后，DB中所有表格的总No_of_Occurence可以在下面找到

select PatientUID,sum(No_of_Occurences) as No_of_Occurences
from
(
select PatientUID,count(PatientUID) as No_of_Occurences
from PatientAddress
group by PatientUID
union all
select PatientUID,count(PatientUID) as No_of_Occurences
from ContactInfo
group by PatientUID
) as all_tables
group by PatientUID

使用最终查询中的where子句搜索您选择的某个特定PatientUid的出现位置。

Answer 2

选择 tab1.name为[referenced_table]， col1.name as [referrenced_key_column]， tab2.name为[primary_table]， col2.name as [primary_Key_column] 来自sys.foreign_key_columns fkc

内部联接sys.objects obj on obj.object_id = fkc.constraint_object_id tab1.object_id = fkc.parent_object_id上的内连接sys.tables选项卡 col1.column_id = parent_column_id上的内连接sys.columns col1和col1.object_id = tab1.object_id tab2.object_id = fkc.referenced_object_id上的内连接sys.tables选项卡2 col2.column_id = referenced_column_id上的内连接sys.columns col2和col2.object_id = tab2.object_id

其中obj.name喜欢＆＃39;％Patient％＆＃39;和col2.name喜欢＆＃39;％PatientUid％＆＃39;

想要在表格中找到PatientUid的出现

2 个答案: