--Create Table
CREATE TABLE [dbo].[TblA](a_id INT, c1 INT);
GO
INSERT INTO [dbo].[TblA](a_id,c1)
VALUES(1,345),(2,132);
GO
CREATE TABLE [dbo].[TblB](b_id INT, c2 INT);
GO
INSERT INTO [dbo].[TblB](b_id,c2)
VALUES(1,245),(2,456);
GO
--Solution 1
SELECT Distinct *
FROM [dbo].[TblA]
INNER JOIN [dbo].[TblB]
ON ([dbo].[TblA].a_id = [dbo].[TblB].b_id)
--Solution 2
SELECT *
FROM [dbo].[TblA] a, [dbo].[TblB] b
WHERE a.a_id = b.b_id
--Solution 3
SELECT * FROM [dbo].[TblA]
UNION ALL
SELECT * FROM [dbo].[TblB]
--Solution 4
DECLARE @some_value INT = 0;
SELECT *
FROM [dbo].[TblA] AS A
JOIN [dbo].[TblB] AS B
ON @some_value = 2;
DECLARE @some_value INT = 2;
SELECT *
FROM [dbo].[TblA] AS A
JOIN [dbo].[TblB] AS B
ON @some_value = 2;
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