How to Hide A Column In A Row In Oracle?

To hide a column in a row in Oracle, you can use the UPDATE statement to set the value of the column to NULL or empty string. Another option is to modify the SELECT statement to exclude the column from the result set. This can be done by specifying only the columns needed in the SELECT clause. Additionally, you can use the COLUMN command in SQL*Plus to set the format of the column to be hidden, making it invisible when queried.

What is the impact of hiding a column in a row in Oracle?

Hiding a column in a row in Oracle can have both positive and negative impacts.

Positive impacts:

1. Improved performance: Hiding unnecessary columns in a row can improve query performance as the database engine does not have to retrieve and process those columns.
2. Security: Hiding sensitive information by not displaying certain columns in a row can enhance data security and privacy.
3. User experience: Hiding irrelevant or redundant columns can make the user interface cleaner and easier to navigate.

Negative impacts:

1. Data completeness: Hiding columns may result in important data being overlooked or forgotten, leading to incomplete or inaccurate data analysis.
2. Data integrity: If critical columns are hidden, it may cause inconsistencies in the database and affect data integrity.
3. Troubleshooting: Hiding columns can make it difficult for developers or administrators to troubleshoot issues related to the data or database structure.

Overall, hiding a column in a row in Oracle should be done carefully and thoughtfully to ensure that it does not negatively impact data integrity, completeness, or usability.

What is the correct method for hiding a column in a row in Oracle?

To hide a column in a row in Oracle, you can use the SQL SELECT statement and specify the columns you want to display. By omitting the column you want to hide from the SELECT statement, you can effectively hide it from being displayed in the result set.

For example, if you have a table named employees with columns employee_id, first_name, last_name, and email and you want to hide the email column, you can write a SELECT statement like this:

1
2

SELECT employee_id, first_name, last_name
FROM employees;

This will display only the employee_id, first_name, and last_name columns in the result set, effectively hiding the email column.

How to hide a column from being displayed in a result set in Oracle?

To hide a column from being displayed in a result set in Oracle, you can simply exclude the column from the SELECT statement in your query.

For example, if you have a table called "employees" with columns "employee_id", "first_name", "last_name", and "salary", and you want to hide the "salary" column in the result set, you can do the following:

1
2

SELECT employee_id, first_name, last_name
FROM employees;

This query will only display the "employee_id", "first_name", and "last_name" columns in the result set, while omitting the "salary" column.

How to hide a column without affecting the query results in Oracle?

One way to hide a column without affecting the query results in Oracle is to use the "SELECT" statement with specific column names.

For example, suppose you have a table called "employees" with columns "emp_id", "emp_name", and "emp_salary". If you want to hide the "emp_salary" column in the query results, you can write the following query:

1
2

SELECT emp_id, emp_name
FROM employees;

This query will only display the "emp_id" and "emp_name" columns in the result set, effectively hiding the "emp_salary" column without affecting the query results.

What is the best practice for hiding a column in Oracle?

The best practice for hiding a column in Oracle is to use the "ALTER TABLE" statement to remove the column from the table. This will remove the column entirely, making it inaccessible to users and applications. This approach is the most secure way to hide a column as it ensures that the data is completely removed from the table structure. Alternatively, you can also set the column to be invisible by using the "ALTER TABLE" statement with the "MODIFY" option and the "INVISIBLE" keyword. This will hide the column from the table structure, but it can still be accessed by users with the appropriate privileges.