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Oracle SQL: An Introduction to the most popular database

A quick tour of the six principal clauses of the SELECT statement.

This course is a brief presentation of Oracle SQL.

We will install a version of Oracle Express Edition and Oracle SQL Developer for free.

  • The Oracle Express Edition is the back engine, which does all of the work.

  • Oracle SQL Developer is the front engine, which allows you to send queries and see the results.

We’ll then look at the SELECT statement with its 6 main clauses (SELECT, FROM, WHERE, GROUP BY, HAVING and ORDER BY).

  • The SELECT clause says what fields you want to retrieve.

  • The FROM clause shows the data source.

  • The WHERE clause filters it down, based on criteria you choose.

  • The GROUP BY clause aggregates (sums, count, min, max) it together, creating a summary.

  • The HAVING clause can summarise it further.

  • The ORDER BY clause then orders the results.

As part of this, we’ll be looking at how you can rename fields in a query, how you can use the AS keyword, and semicolons and comments.

Following this, we’ll look at what else you need to know, and resources (which range from FREE to very expensive) which will help you to learn it.

No prior knowledge is required – just a willingness to learn.

See you on the course.

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