Question

In SQL, how is a field name qualified?

1) By putting the name of the table in front of the field name and separating them with a period
2) By putting the name of the field in front of the table name and separating them with a period
3) By using parentheses around the field name
4) By using square brackets around the field name

Answer 1

In SQL, a field name is qualified by placing the table name before the field name, separated by a period. The correct answer is option (A).

Step-by-step explanation:

In SQL, a field name is qualified by putting the name of the table in front of the field name and separating them with a period. The correct way to qualify a field name is option 1: By putting the name of the table in front of the field name and separating them with a period. An example of this would be tableName.fieldName.

Qualifying field names is essential when dealing with queries that involve multiple tables where field names could be ambiguous. It helps to clearly distinguish which table the column belongs to. This is particularly useful in JOIN operations or when tables have columns with the same name.

Square brackets around the field name are used in some database systems like Microsoft SQL Server to handle field names with spaces or reserved keywords, but that is not a standard method for qualifying field names.