The LEFT JOIN keyword returns all records from the left table (table1), and the matching records from the right table (table2). The result is 0 records from the right side, if there is no match.
The answer is C. this is a Left Join. In this case you show everything on the left side regardless of whether they appear on the right. When it does not appear on the right you represent that with a Null. So, for a3, store id is null.
C is the correct answer.
In a LEFT JOIN, all the records from the left table are included, and only the matching records from the right table are added. In this case, "a1" and "a4" from the left table (favorite_stores) match with "a1" and "a4" from the right table (sales). So, these matching records are fetched. Additionally, all the records from the left table, including "a3," are included. Since "a3" has no corresponding store_id in the right table, the store_id for "a3" will be NULL. Therefore, after the LEFT JOIN, the result will include "a1," "a3" (with a NULL store_id), and "a4."
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