How to Separate Range Of Year on Oracle?

To separate a range of years in Oracle, you can use the TO_CHAR function to extract the year from a date column and then create a condition using the BETWEEN operator.

For example, if you have a table called "sales" with a column "sale_date" of type DATE, you can write a query to select rows where the year is between 2018 and 2020 like this:

SELECT * FROM sales WHERE TO_CHAR(sale_date, 'YYYY') BETWEEN '2018' AND '2020';

This query will return all rows from the sales table where the year in the sale_date column is between 2018 and 2020. You can adjust the years in the BETWEEN condition to select a different range of years as needed.

How to handle null values in a year range on Oracle

When dealing with null values in a year range on Oracle, you have several options to consider:

1. Use COALESCE() function: You can use the COALESCE() function to replace any null values with a default value in the year range column.

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SELECT COALESCE(year_range_column, 'NA') AS year_range
FROM your_table;

1. Use CASE statement: You can use a CASE statement to handle null values in the year range column and replace them with a default value.

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SELECT 
  CASE 
    WHEN year_range_column IS NULL THEN 'NA' 
    ELSE year_range_column 
  END AS year_range
FROM your_table;

1. Filter out null values: You can simply filter out rows with null values in the year range column using a WHERE clause.

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SELECT year_range_column
FROM your_table
WHERE year_range_column IS NOT NULL;

1. Use NVL() function: The NVL() function can be used to replace null values with a default value in the year range column.

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SELECT NVL(year_range_column, 'NA') AS year_range
FROM your_table;

Choose the method that best suits your specific requirements and data handling preferences.

How to validate a year range on Oracle

There are several ways to validate a year range on Oracle.

One way is to use a CHECK constraint on the table column that stores the year. For example, you can add a CHECK constraint like this to ensure that the year is between 1900 and 2100:

ALTER TABLE table_name ADD CONSTRAINT check_year_range CHECK (year_column >= 1900 AND year_column <= 2100);

Another way is to use a trigger to validate the year range before inserting or updating a record. For example, you can create a trigger like this:

CREATE OR REPLACE TRIGGER validate_year_range BEFORE INSERT OR UPDATE ON table_name FOR EACH ROW BEGIN IF :NEW.year_column < 1900 OR :NEW.year_column > 2100 THEN RAISE_APPLICATION_ERROR(-20001, 'Year must be between 1900 and 2100'); END IF; END;

These are just a few examples of how you can validate a year range on Oracle. Depending on your specific requirements and constraints, you may need to use a combination of CHECK constraints, triggers, or other validation mechanisms.

How to sort data by year range on Oracle

To sort data by year range on Oracle, you can use the EXTRACT function to extract the year from a date column and then use a CASE statement to categorize the years into ranges. Here's an example query to sort data by year range:

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SELECT *
FROM your_table
ORDER BY 
  CASE
    WHEN EXTRACT(YEAR FROM your_date_column) >= 2000 AND EXTRACT(YEAR FROM your_date_column) < 2010 THEN 1
    WHEN EXTRACT(YEAR FROM your_date_column) >= 2010 AND EXTRACT(YEAR FROM your_date_column) < 2020 THEN 2
    WHEN EXTRACT(YEAR FROM your_date_column) >= 2020 AND EXTRACT(YEAR FROM your_date_column) < 2030 THEN 3
    ELSE 4
  END;

In this query:

• your_table is the name of your table
• your_date_column is the name of the date column in your table
• The EXTRACT(YEAR FROM your_date_column) function extracts the year from the date column
• The CASE statement categorizes the years into different ranges (2000-2009, 2010-2019, 2020-2029, and others)
• The ORDER BY clause sorts the data based on the year range categories

You can adjust the year ranges and sorting logic based on your requirements.