SQL SELECT Query on related table - ms-access

Question

I have a question for which I found a rather long solution of which I don't think that it is good practise.
However I feel there must be a syntax available that is able to solve this issue right away without too many complexities.
I bumped into this problem a few times already, and I'd like to know for once and for all.
I have a table called "T_STOP_LOSS", in which I have three columns "LIVES_FROM", "LIVES_TO" and "SL_VALUE" (All number types + the column containing ID with AutoNumber type).
I want to retrieve the record containing the SL_VALUE where a variable value lies in the interval between LIVES_FROM and LIVES_TO.
ID LIVES_FROM LIVES_TO NR_COUNTRIES_FROM NR_COUNTRIES_TO SL_VALUE
1 0 999 2 2 39,3
12 0 999 3 3 34,6
23 0 999 4 4 29,6
34 0 999 5 9 25,7
45 0 999 10 100 22,17
46 1000 1499 2 2 31,1
2 1000 1499 3 3 27,4
13 1000 1499 4 4 23,3
24 1000 1499 5 9 20,4
35 1000 1499 10 100 17,5
36 1500 1999 2 2 23,6
47 1500 1999 3 3 20,7
3 1500 1999 4 4 17,7
14 1500 1999 5 9 15,4
25 1500 1999 10 100 13,3
26 2000 2999 2 2 23,6
37 2000 2999 3 3 20,7
48 2000 2999 4 4 17,7
4 2000 2999 5 9 15,4
15 2000 2999 10 100 13,3
Normally I would use:
lNr_Lives = <Something> '(Retrieved via Textbox)
sSQL_Select = "SELECT SLVALUE FROM T_STOP_LOSS WHERE LIVES_FROM <= " & LNr_Lives & " AND LIVES_TO >= " & LNr_Lives & ";"
However, LIVES_FROM and LIVES_TO are related to the table NR_LIVES through a foreign key.
The above statement will never work because table 'NR_LIVES' contains an ID field as Primary Key, which is used to link to the T_STOP_LOSS table.
(The columns in NR_LIVES are named: ID, NR_LIVES_FROM and NR_LIVES_TO (not that it matters)).
ID NR_LIVES_FROM NR_LIVES_TO
1 0 999
2 1000 1499
3 1500 1999
4 2000 2999
Please tell me, what would you consider to be the briefest way to access the real value of LIVES_FROM and LIVES_TO that is stored in the NR_LIVES table and get my SELECT statement working the way I expect it (Return the record that contains the SL for the right interval).
I hope that my question is clear. If not, don't hesitate to mention.

Answer 1

Looks to me like you want to do some simple join queries. First check out these references here and here to get you more familiar with the approach.
Secondly, there is generally no reason to have the extra 'Lookup' columns in the child tables as these values can be accessed from an appropriate JOIN query.
I suspect the query you are looking for is:
SELECT SLVALUE FROM
T_STOP_LOSS
INNER JOIN
NR_LIVES
ON T_STOP_LOSS.ID=NR_LIVES.ID
WHERE
NR_LIVES_FROM <= LNr_Lives
AND
NR_LIVES_TO >= LNr_Lives ;

Answer 2

Thanks to Nicolas, I found what I needed.
Dim cQueries As clsQueries
Dim oRst As DAO.Recordset
Dim sSQL_Select As String
Dim LNr_Lives As Long
Dim iNr_Countries As Integer
Dim i As Integer
If Not IsNull(Me.txt_Nr_Lives) Then
LNr_Lives = Me.txt_Nr_Lives
Else
MsgBox "No number of lives defined!", vbCritical
Exit Sub
End If
If Not IsNull(Me.cbb_Nr_Countries) Then
iNr_Countries = Me.cbb_Nr_Countries
Else
MsgBox "No number of countries defined!", vbCritical
Exit Sub
End If
Set cQueries = New clsQueries
sSQL_Select = "SELECT " & _
"* " & _
"FROM " & _
"T_STOP_LOSS " & _
"INNER JOIN " & _
"NR_LIVES ON (T_STOP_LOSS.LIVES_FROM = NR_LIVES.ID) " & _
" WHERE " & _
"NR_LIVES.NR_LIVES_FROM <= " & LNr_Lives & _
" AND " & _
"NR_LIVES.NR_LIVES_TO >= " & LNr_Lives & _
" AND " & _
"T_STOP_LOSS.NR_COUNTRIES_FROM <= " & iNr_Countries & _
" AND " & _
"T_STOP_LOSS.NR_COUNTRIES_TO >= " & iNr_Countries & ";"
Set oRst = cQueries.Select_Statement(sSQL_Select)
oRst.MoveFirst
Do While Not oRst.EOF
Me.txt_FSL = oRst![SL_VALUE]
oRst.MoveNext
Loop