When joining tables using SQL, the tables are typically joined with a condition that equates a _______ in the main table (on the "one" side of the relationship) with a _________ in the secondary table (on the "many" side of the relationship). Generally, the main table is the larger of the two tables. (This is a SQL question, but I am not asking about SQL code. I know what you're thinking...)

Question

When joining tables using SQL, the tables are typically joined with a condition that equates a _______ in the main table (on the "one" side of the relationship) with a _________ in the secondary table (on the "many" side of the relationship).  Generally, the main table is the larger of the two tables.  (This is a SQL question, but I am not asking about SQL code.  I  know what you're thinking...)

BlackTom AI · Accepted Answer

To begin, restating the core idea: when joining tables in SQL, the common pattern is to connect a key from the main (one) side to a key on the related (many) side.
Option 1: 'Public key, Private key' is incorrect because SQL joins rely on keys used to enforce relationships, not labels like public/private keys used in cryptography.
Option 2: 'Primary key, Foreign key' matches the typical relational design: the main table's primary key uniquely identifies each row, and the secondary (many) table contains a foreign key that references that primary key to establish the relationship.
Option 3: 'Primary key, Primary key' is flawed because both sides would be primary keys; that would imply both tables independently have unique identifiers that do not create a meaningful one-to-many relationship through a shared reference.
Option 4: 'Foreign key, Foreign key' is incorrect because the joining side in the main table should expose the primary identifier that is being referenced; using a foreign key in the main table would imply the main table points to another table's key, not the typical one-to-many linkage from the parent to the child.

In more depth: the canonical foreign key pattern involves the child (secondary) table containing a foreign key column that references the primary key of the parent (main) table. This ensures referential integrity and enables efficient joins to retrieve related data across tables.
By contrast, using two foreign keys or mismatched key roles would break the standard one-to-many join logic and complicate the relationship semantics.

So, on balance, only Option 2 correctly identifies the primary key in the main table and the corresponding foreign key in the secondary table as the typical join condition.

ISA235 A Exam 2:CH 5-7 (Remotely Proctored)

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