This introduction covers Talking to Databases within SQL for GCSE Computer Science. Revise SQL in 3.7 Relational Databases and SQL for GCSE Computer Science with 19 exam-style questions and 10 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 2 of 9 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
Talking to Databases
SQL (Structured Query Language) is how we communicate with databases. Think of a database as a massive, organised filing cabinet. SQL is the language you use to ask questions: "Give me all customers from London" or "Show products under £50 sorted by price." SELECT retrieves data, FROM specifies the table, WHERE filters results. It's like Google for databases!
Practice questions for SQL
Which SQL keyword is used to choose which columns to retrieve from a database table?
Explain the difference between using AND and OR to combine conditions in an SQL WHERE clause. Give an example of when each would be used.