[Not a question] Dear all, Please help me it's very urgent to achieve below query, I want to join different table on condition (table2 and table3)

DECLARE @query VARCHAR(MAX);
--Beginning part of the query
SET @query = 'SELECT * FROM table1 INNER JOIN ';

--Get ID from the table
SELECT  @ID = ID FROM table1 WHERE BLAH-BLAH = BLAH-BLAH;
--With respect to ID table name is set to the query
IF (@ID = 1)
SET @query += 'table2 ';
else
SET @query += 'table3 ';

--Final part of query
SET @query += 'ON tbljoin.id=table1.id';

--Now execute the query
exec(@query);