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Question 4What will this query return?SELECT *FROM Books_tableLEFT JOIN Biography_table1 pointAll records in Books_table and any matching rows from Biography_tableAll records in both Books_table and Biography_tableAll records in Biography_table and any matching rows from Books_tableAll rows from Books_table joined together with Biography_table

Question

Question 4What will this query return?SELECT *FROM Books_tableLEFT JOIN Biography_table1 pointAll records in Books_table and any matching rows from Biography_tableAll records in both Books_table and Biography_tableAll records in Biography_table and any matching rows from Books_tableAll rows from Books_table joined together with Biography_table

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Solution

This SQL query will return all records in the Books_table and any matching rows from the Biography_table.

Here's a step-by-step explanation:

  1. SELECT * - This part of the query is asking to return all columns. The asterisk (*) is a wildcard character that represents all columns.

  2. FROM Books_table - This part of the query specifies the primary table that we are selecting records from, which is the Books_table.

  3. LEFT JOIN Biography_table - This part of the query is performing a LEFT JOIN operation with the Biography_table. A LEFT JOIN returns all the records from the left table (Books_table), and the matched records from the right table (Biography_table). If there is no match, the result is NULL on the right side.

So, the query will return all records in the Books_table, and for those records where there is a matching record in the Biography_table, the columns from the Biography_table will also be included. If there is no matching record in the Biography_table, those columns will be filled with NULL.

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