Best approach to SQL Server query using distinct

SELECT * FROM TableA
JOIN
(SELECT DISTINCT IdA FROM TableB WHERE Date = '20090110') a
ON a.IDA = TAbleA.IDA
ORDER BY TableA.IdA

SELECT *
FROM TableA A
WHERE Exists( select B.IdA from TableB B where A.IdA = B.IdA and B.Date = '2009-01-10' )
ORDER BY A.Id;

Select TableA.*, groupedTableB.OtherData
From TableA
Inner join
(
    select TableB.IdA, Sum(TableB.Data) SummaryData
    from TableB where TableB.Date = '2009-01-10'
    group by TableB.IdA

) groupedTableB on groupedTableB.IdA = TableA.IdA

distinct

distinct