Foreign key: A primary key attribute in one table is the foreign key for another table. In logical way, a foreign key is used to establish a relationship between two tables. A foreign key is used for identifying a row of another table uniquely. Foreign keys are represented in italic form. ALTER TABLE Statement: “ALTER TABLE” statement comes under Data Definition Language (DDL). It is used to modify column, add constraints, add column(s), drop column, rename column name and table name, drop constraints, and so on. Syntax: The Syntax to drop constraint is as follows: ALTER TABLE table_Name ADD CONSTRAINT constraint_Name;

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(Short-answer) b. Continue from the previous question. Suppose part of the data you extracted from the data warehouse is the following. Identify the missing values you think exist in the dataset. Use Column letter and Row number to refer to each missing value in the dataset. Please write down how you want to address each particular missing value (you can group them if they receive same treatment). For imputation, you do not need to calculate the exact imputed values but just describe what kind of value you want to use to impute.

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Chapter 7, Problem 11SCG

Program Plan Intro

Foreign key:

A primary key attribute in one table is the foreign key for another table. In logical way, a foreign key is used to establish a relationship between two tables.

A foreign key is used for identifying a row of another table uniquely.

Foreign keys are represented in italic form.

ALTER TABLE Statement:

“ALTER TABLE” statement comes under Data Definition Language (DDL).

It is used to modify column, add constraints, add column(s), drop column, rename column name and table name, drop constraints, and so on.

Syntax:

The Syntax to drop constraint is as follows:

ALTER TABLE table_Name ADD CONSTRAINT constraint_Name;

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