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Software Engineering › Key terms › Y12 Programming for the Web › SQL JOIN

SQL JOIN

Code pattern Y12 Programming for the Web

Definition

Combines rows from two or more tables by matching a primary key to a foreign key (INNER JOIN ... ON a.id = b.id).

Example

FROM Student JOIN Class ON Student.ClassID = Class.ClassID

Found in: syllabus, school notes.

Where it is used in the test

Syllabus area: Y12 Programming for the Web.

Question types it can appear in

Where it has appeared in the paper

Programming for the Web (Part A, B, C). Part letters follow each paper’s own layout.

Related past questions

These are the questions the flashcard set links to this term. Open each one and compare your answer with its marking criteria.

Study links

How to use it in an answer

A model sentence

General advice, built from the definition and example above

Code pattern: “Combines rows from two or more tables by matching a primary key to a foreign key (INNER JOIN ...” Then apply it: FROM Student JOIN Class ON Student.ClassID = Class.ClassID

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Technique for the question types

What the marking guidelines and feedback say

Sample exam Q17 (3 marks): SQL (join, filter, order)

An INNER JOIN ... ON equivalent is equally valid. Quote text values. Both tables have a column called Name, so qualify them (Table.Name).

2025 HSC Q9 (1 mark): ORM and SQL

Read from the MG table layout: row 2 has two ticks; rows 1 and 3 have one tick in the ORM column.

Worked answers from the marking guidelines

Familiarisation Q12b (3 marks): SQL (joins, AS) (3 marks): criteria and sample answer

Criteria

3: Correct SQL query. 2: Substantially correct query with at least TWO of: renaming the columns; selecting the three tables; joining the tables. 1: Some understanding of renaming the columns or joining the tables.

Sample answer

SELECT Customers.CustName as 'Customer', Products.ProductName as 'Product', Orders.OrderQuantity as 'Quantity' FROM Products, Customers, Orders WHERE Orders.ProductID = Products.ProductID AND Orders.CustID = Customers.CustID ORDER BY Orders.OrderID ASC

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Sample exam Q17 (3 marks): SQL (join, filter, order) (3 marks): criteria and sample answer

Criteria

3: Correct SQL query. 2: Addresses some of the requirements. 1: Some understanding of SQL.

Sample answer

SELECT Products.Name AS 'Product', Suppliers.Name AS 'Supplier' FROM Products, Suppliers WHERE Products.SupplierID = Suppliers.SupplierID AND Products.Producer = 'Yumtreats' AND Products.Mass >= 50 ORDER BY Products.Name DESC

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Common mistakes

Marker feedback on other questions of the same type (code and diagram feedback often applies across questions)
  • SQL questions (2025 HSC exam Q21): query must run; quotation marks around data being searched; use OR/AND in WHERE; correct GROUP BY and ORDER BY fields.
General advice
  • Use the term exactly as the syllabus words it, then link it to the scenario in the question; the 2025 feedback repeatedly rewards using the stimulus.
  • Answer the command word: outline gives main points only, explain gives a reason or cause, discuss gives both sides.

Same group in the syllabus: Shell commands (mkdir, cd, touch, cp, rm, cat, grep) · SQL SELECT · SQL WHERE · SQL ORDER BY · SQL GROUP BY · SQL aggregate functions (COUNT, SUM, AVG) · SQL alias (AS) · SQL constraints · Primary key and foreign key · Object-relational mapping (ORM) · Service worker · Web app manifest · CRUD

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