postgresql - How to extract year from HIRE_DATE in sql

Postgresql - How to extract year from HIRE_DATE in sql

In PostgreSQL, you can extract the year from a DATE or TIMESTAMP column using the EXTRACT function. If your HIRE_DATE is of type DATE or TIMESTAMP, you can use it to extract the year. Here's an example:

-- Assuming HIRE_DATE is of type DATE or TIMESTAMP SELECT EXTRACT(YEAR FROM HIRE_DATE) AS hire_year FROM your_table;

Replace your_table with the actual name of your table and HIRE_DATE with the column name.

If HIRE_DATE is a string (VARCHAR), and it's in a format that PostgreSQL can implicitly cast to a date, you can cast it to a date and then extract the year. For example:

-- Assuming HIRE_DATE is a string in 'YYYY-MM-DD' format SELECT EXTRACT(YEAR FROM HIRE_DATE::DATE) AS hire_year FROM your_table;

This assumes that the string in HIRE_DATE can be safely cast to a date. If it's in a different format, you may need to use the TO_DATE function to explicitly specify the format.

-- Assuming HIRE_DATE is a string in 'MM/DD/YYYY' format SELECT EXTRACT(YEAR FROM TO_DATE(HIRE_DATE, 'MM/DD/YYYY')) AS hire_year FROM your_table;

Replace 'MM/DD/YYYY' with the actual format of your date string.

Examples

  1. Extract Year from HIRE_DATE Using EXTRACT Function

    -- Extract year from HIRE_DATE using EXTRACT function SELECT EXTRACT(YEAR FROM HIRE_DATE) AS hire_year FROM your_table;

    Description: Use the EXTRACT function to extract the year from the HIRE_DATE column.

  2. Extract Year from HIRE_DATE Using DATE_PART Function

    -- Extract year from HIRE_DATE using DATE_PART function SELECT DATE_PART('year', HIRE_DATE) AS hire_year FROM your_table;

    Description: Utilize the DATE_PART function to extract the year from the HIRE_DATE column.

  3. Extract Year from HIRE_DATE Using TO_CHAR Function

    -- Extract year from HIRE_DATE using TO_CHAR function SELECT TO_CHAR(HIRE_DATE, 'YYYY') AS hire_year FROM your_table;

    Description: Use the TO_CHAR function to format the HIRE_DATE as a string and extract the year.

  4. Extract Year from HIRE_DATE Using EXTRACT and CAST Functions

    -- Extract year from HIRE_DATE using EXTRACT and CAST functions SELECT EXTRACT(YEAR FROM CAST(HIRE_DATE AS TIMESTAMP)) AS hire_year FROM your_table;

    Description: Cast HIRE_DATE to a timestamp and then use the EXTRACT function to get the year.

  5. Extract Year from HIRE_DATE Using EXTRACT and DATE_TRUNC Functions

    -- Extract year from HIRE_DATE using EXTRACT and DATE_TRUNC functions SELECT EXTRACT(YEAR FROM DATE_TRUNC('year', HIRE_DATE)) AS hire_year FROM your_table;

    Description: Use DATE_TRUNC to truncate the date to the beginning of the year and then extract the year using EXTRACT.

  6. Extract Year from HIRE_DATE Using EXTRACT with Date Part 'Epoch'

    -- Extract year from HIRE_DATE using EXTRACT with date part 'Epoch' SELECT EXTRACT(EPOCH FROM HIRE_DATE)::INT / 31536000 AS hire_year FROM your_table;

    Description: Extract the number of seconds since the epoch and calculate the year.

  7. Extract Year from HIRE_DATE Using EXTRACT and Interval Arithmetic

    -- Extract year from HIRE_DATE using EXTRACT and interval arithmetic SELECT EXTRACT(YEAR FROM age(current_date, HIRE_DATE)) AS hire_year FROM your_table;

    Description: Use the age function for interval arithmetic to calculate the difference in years.

  8. Extract Year from HIRE_DATE Using EXTRACT with Age Function

    -- Extract year from HIRE_DATE using EXTRACT with age function SELECT EXTRACT(YEAR FROM age(HIRE_DATE)) AS hire_year FROM your_table;

    Description: Use the age function directly with EXTRACT to get the year.

  9. Extract Year from HIRE_DATE Using SUBSTRING Function

    -- Extract year from HIRE_DATE using SUBSTRING function SELECT SUBSTRING(CAST(HIRE_DATE AS VARCHAR) FROM 1 FOR 4) AS hire_year FROM your_table;

    Description: Convert HIRE_DATE to a string and use SUBSTRING to extract the first four characters representing the year.

  10. Extract Year from HIRE_DATE Using EXTRACT with AGE and Date Part 'Year'

    -- Extract year from HIRE_DATE using EXTRACT with AGE and date part 'Year' SELECT EXTRACT(YEAR FROM AGE(HIRE_DATE, current_date)) AS hire_year FROM your_table;

    Description: Use EXTRACT with AGE and specify the date part as 'Year' to get the year difference.

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