Question

The " * " symbol is used in which of the following cases in SQL?

I. Exponent notation
II. Multiplication
III. Selecting all rows from a table.
IV. Selecting all columns from a table.

a) II and IV.
b) I and III.
c) II and III.
d) I, II, III, and IV.
e) III and IV.

Answer 1

In SQL, the '*' symbol is used for multiplication and for selecting all columns from a table with a SELECT statement.

The * symbol in SQL is used for different purposes depending on the context. While in arithmetic, the * symbol is recognized as a multiplication operator, in SQL, it is most commonly used to select all columns from a table when used in the SELECT statement. For example, SELECT * FROM table_name; will return all columns from table_name. However, in SQL, the exponent notation is not represented by the * symbol; rather, SQL uses the POWER() function for such operations. Therefore, the correct uses of the * symbol in SQL are for multiplication and selecting all columns from a table.