SQL Server LEFT JOIN and WHERE clause

Question

Here is my code

SELECT ID, Name, Phone 
FROM Table1 
LEFT JOIN Table2 ON Table1.ID = Table2.ID
WHERE Table1.ID = 12 AND Table2.IsDefault = 1

<

Answer 1

SELECT ID, Name, Phone FROM Table1 
  LEFT JOIN Table2 ON Table1.ID = Table2.ID
  WHERE Table1.ID = 12 
    AND (Table2.IsDefault IS NULL OR Table2.IsDefault = 1);