Question

7.1 Describe the six clauses in the syntax of an SQL retrieval query. Show what type of constructs can be specified in each of the six clauses. Which of the six clauses are required and which are optional

Answer 1

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Step-by-step explanation:

The syntax of an SQL retrieval query is made up of six clauses. In the order in which they are used, they consist of: SELECT, FROM, WHERE, GROUP BY, HAVING and order by.

Of all these clauses, the SELECT clause and the FROM clause are required and must be included. They are the first two used to begin the retrieval query. The others are optional.

The SELECT clause allows you to choose the columns you want to get information or data, from.

The FROM clause identifies the table where the information is being retrieved.

The WHERE clause specifies a condition for the retrieval of information.

You use the GROUP BY clause to group your data in a meaningful way.

You use the HAVING clause to specify a condition on the group.

The ORDER BY clause is used to order results rows in descending or ascending order.