Describe how to construct a detailed query in a step-by-step fashion
To construct a detailed query in a step-by-step fashion, do the following:
1 . List in the SELECT clause all the columns you want to display. If the name of a column appears in more than one table, precede the column name with the table name.
2 . List in the FROM clause all the tables involved in the query. Usually you include the tables that contain the columns listed in the SELECT clause. Occasionally, however, there might be a table that does not contain any columns used in the SELECT clause but that does contain columns used in the WHERE clause. In this case, you must also list the table.
3 . Take one pair of related tables at a time and indicate in the WHERE clause the condition that relates the tables. Join these conditions with the AND operator. When there are other conditions, include them in the WHERE clause and connect them to the other conditions with the AND operator.
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