SQL Filtering rows with no duplicate value - sql

Question

Hi so I'm new to SQL and I'm trying to find a way in which I can obtain only the rows that have values that are not duplicate to each other in a specific column of table.
For example the Table below is called T1 and contains:
ID|Branch ID
1 444
2 333
3 444
4 111
5 555
6 333
The result I want will be
ID|Branch ID
4 111
5 555
So only showing non duplicate rows
Edit: I want to apply this to a large relational code. Here is a snippet of where I want it to be added
FROM dbo.LogicalLine
INNER JOIN dbo.Page ON dbo.LogicalLine.page_id = dbo.Page.id
INNER JOIN dbo.Branch ON dbo.LogicalLine.branch_id = dbo.Branch.id
The table LogicalLine will have a column called branch_id containing duplicate id values. I wish to filter those out showing only the non-duplicate branch_id like above example then INNER JOIN the Branch table into the LogicalLine which I have done.
Added -Full Code here:
SELECT
(SELECT name
FROM ParentDevice
WHERE (Dev1.type NOT LIKE '%cable%') AND (id = Dev1.parent_device_id))T1_DeviceID,
(SELECT name
FROM Symbol
WHERE (id = CP1.symbol_id) AND (type NOT LIKE '%cable%'))T1_DeviceName,
(SELECT name
FROM Location
WHERE (id = Page.location_id))T1_Location,
(SELECT name
FROM Installation
WHERE (id = Page.installation_id))T1_Installation,
(SELECT name
FROM ParentDevice
WHERE (Dev2.type NOT LIKE '%cable%') AND (id = Dev2.parent_device_id))T2_DeviceID,
(SELECT name
FROM Symbol
WHERE ( id = CP2.symbol_id) AND (type NOT LIKE '%cable%'))T2_DeviceName,
(SELECT name
FROM Location
WHERE (id = PD2.location_id))T2_Location,
(SELECT name
FROM Installation
WHERE (id = Page.installation_id))T2_Installation,
(SELECT devicefamily
FROM Device
WHERE (type LIKE '%cable%') AND (id = SymCable.device_id))CablePartNumber,
(SELECT name
FROM ParentDevice
WHERE (id = DevCable.parent_device_id) AND (DevCable.type LIKE '%cable%'))CableTag
FROM dbo.LogicalLine
INNER JOIN dbo.Page ON dbo.LogicalLine.page_id = dbo.Page.id
INNER JOIN dbo.Branch ON dbo.LogicalLine.branch_id = dbo.Branch.id
LEFT OUTER JOIN dbo.Symbol AS SymCable ON dbo.LogicalLine.cable_id = SymCable.id
LEFT OUTER JOIN dbo.Device AS DevCable ON SymCable.device_id = DevCable.id
LEFT OUTER JOIN dbo.ParentDevice AS ParentCable ON DevCable.parent_device_id = ParentCable.id
INNER JOIN dbo.SymbolCP AS CP1 ON dbo.Branch.cp1_id = CP1.id
INNER JOIN dbo.SymbolCP AS CP2 ON dbo.Branch.cp2_id = CP2.id
INNER JOIN dbo.Symbol AS S1 ON CP1.symbol_id = S1.id
INNER JOIN dbo.Symbol AS S2 ON CP2.symbol_id = S2.id
INNER JOIN dbo.Device AS Dev1 ON S1.device_id = Dev1.id
INNER JOIN dbo.Device AS Dev2 ON S2.device_id = Dev2.id
INNER JOIN dbo.ParentDevice AS PD1 ON Dev1.parent_device_id = PD1.id
INNER JOIN dbo.ParentDevice AS PD2 ON Dev2.parent_device_id = PD2.id
INNER JOIN dbo.Location AS L1 ON PD1.location_id = L1.id
INNER JOIN dbo.Location AS L2 ON PD2.location_id = L2.id
INNER JOIN dbo.Installation AS I1 ON L1.installation_id = I1.id
INNER JOIN dbo.Installation AS I2 ON L2.installation_id = I2.id
WHERE
(PD1.project_id = #Projectid) AND (dbo.LogicalLine.drawingmode LIKE '%Single Line%');

Answer 1

Select Id, BranchId from table t
Where not exists
(Select * from table
where id != t.Id
and BranchId = t.BranchId)
or
Select Id, BranchId
From table
Group By BranchId
Having count(*) == 1
EDIT: to modify as requested, simply add to your complete SQL query a Where clause:
Select l.Id BranchId, [plus whatever else you have in your select clause]
FROM LogicalLine l
join Page p ON p.id = l.page_Id
join Branch b ON b.Id = l.branch_id
Group By l.branch_id, [Plus whatever else you have in Select clause]
Having count(*) == 1
or
Select l.Id BranchId, [plus whatever else you have in your select clause]
FROM LogicalLine l
join Page p on p.id = l.page_Id
join Branch b on b.Id = l.branch_id
Where not exists
(Select * from LogicalLine
where id != l.Id
and branch_id = l.branch_id)