How to Select Columns on the Basis Of Column Names In Oracle?

To select columns based on their names in Oracle, you can specify the column names in the SELECT statement separated by commas. Make sure to use the specific column names that you want to retrieve data from, following the SELECT keyword. This will allow you to fetch only the specific columns you are interested in without retrieving unnecessary data. By selecting columns based on their names, you can ensure that your query is more efficient and only retrieves the data that you require for your analysis or application.

What is the best approach to choose columns based on their names in Oracle?

The best approach to choose columns based on their names in Oracle is to use the SELECT statement with the specific column names you want to retrieve.

For example, if you have a table with columns named column1, column2, and column3, you can use the following query to select only column1 and column2:

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SELECT column1, column2
FROM table_name;

This way, you can specify exactly which columns you want to include in your query results based on their names.

What is the syntax for selecting columns with specific names in Oracle?

To select columns with specific names in Oracle, you can use the following syntax:

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SELECT column1, column2, column3
FROM table_name;

Replace column1, column2, column3, and table_name with the actual column names and table name that you want to select from.

Alternatively, you can use the following syntax to select all columns from a table and filter the results based on specific column names:

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SELECT *
FROM table_name
WHERE column_name = 'specific value';

Replace table_name, column_name, and 'specific value' with the actual table name, column name, and specific value you want to filter by.

What is the alternative way to select columns by their names in Oracle?

One alternative way to select columns by their names in Oracle is to use the AS keyword to assign aliases to the columns in the SELECT statement. This way, you can refer to the columns by their aliases in the query result. Here's an example:

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SELECT column1 AS alias1, column2 AS alias2
FROM table_name;

In this example, column1 and column2 are the original column names in the table, and alias1 and alias2 are the aliases assigned to them in the SELECT statement. You can then refer to these columns by their aliases in subsequent parts of the query.