I have the following doubt about this simple INNER JOIN query.
I have these two tables that have to be joined togheter:
The first table is named VulnerabilityFix and contains the following columns:
Id: int identity
FixName: varchar
Vendor: varchar
Title: varchar
Version: varchar
The second table is named VulnerabilityAlertDocument_VulnerabilityFix (this bind the previous table to another table, but this is not important at this time) and contains the following columns:
VulnerabilityAlertDocumentId: int
VulnerabilityFixId: int
Now, on my DB the VulnerabilityFix table contains only an empty record (this record have an id but all the other fields are empty\null), infact if I perform a select *, I obtain:
select * from VulnerabilityFix
Id FixName Vendor Title Version
1
Into the VulnerabilityAlertDocument_VulnerabilityFix I have something like this:
select * from VulnerabilityAlertDocument_VulnerabilityFix
VulnerabilityAlertDocumentId VulnerabilityFixId
78385 1
78386 1
....................................................
....................................................
....................................................
78398 1
Ok, so I want JOIN toghert these 2 table in in such a way that passing the value of the VulnerabilityAlertDocumentId field of the VulnerabilityAlertDocument_VulnerabilityFix table, I obtain all the related record in the VulnerabilityFix table.
So in this case I aspect to retrieve the previous only record that having an id (having a value equal to 1) and all the other fields are empty\null.
So my query is:
SELECT VF.* FROM VulnerabilityAlertDocument_VulnerabilityFix VAD_VF
INNER JOIN VulnerabilityFix VF ON VAD_VF.VulnerabilityAlertDocumentId = VF.Id
WHERE VAD_VF.VulnerabilityAlertDocumentId = 1
The problem is that when I execute this query I obtain an empty set of records and not the unique record that I expetc to obtain.
Why? What am I missing?
Tnx