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A Guide to SQL

9th Edition
Philip J. Pratt
ISBN: 9781111527273
Textbook Problem

How do you use a computed column in SQL? How do you name the computed column?

Program Explanation

Computed column in SQL:

  • User can perform computations using SQL queries.
  • A computed column does not occurs in the database however it can be computed by using data present in the existing columns.
  • The computations can involve any arithmetic operator.
  • Computations can computed by using the arithmetic operator such + (addition), - (subtraction), * (multiplication) and / (division).
    • Then write the computation result into a place of a particular column name.

Example:

The example for using computed column in SQL is given below:

SELECT STUDENT_ID, STUDENT_NAME, MAXIMUM_LIMIT – SCORE FROM STUDENT;

The above query is used to display student id, student name and student credit from “STUDENT” table...

Program Explanation

Naming the computed column in SQL:

  • User can assign a name to the computation by using below ways:
    • Name the computation with the word “AS”.
    • User desired name.

Example:

The example for naming the computed column in SQL is shown below:

SELECT STUDENT_ID, STUDENT_NAME, MAXIMUM_LIMIT – SCORE AS STUDENT_CREDIT FROM STUDENT;

The above query is used to display student id, student name and student credit from “STUDENT” table...

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