sql - Get negative or positive numbers from a string

Sql - Get negative or positive numbers from a string

To extract negative or positive numbers from a string in SQL, you can use a combination of string manipulation functions like SUBSTRING, PATINDEX, and CHARINDEX. Here's how you can do it:

Suppose you have a string column named your_column containing text that may include negative or positive numbers, and you want to extract these numbers.

Example:

WITH example_data AS ( SELECT 'This is a string with -123 and 456 positive and negative numbers' AS your_column UNION ALL SELECT 'Another string with 789 and -321 numbers' ) SELECT your_column, SUBSTRING(your_column, PATINDEX('%[^0-9.-]%', your_column + ' '), CHARINDEX(' ', your_column + ' ', PATINDEX('%[^0-9.-]%', your_column + ' ')) - PATINDEX('%[^0-9.-]%', your_column + ' ')) AS extracted_number FROM example_data;

In this query:

  • PATINDEX('%[^0-9.-]%', your_column + ' ') finds the position of the first character that is not a digit (0-9), a dot (.), or a minus sign (-).
  • SUBSTRING(your_column, ...) extracts the substring starting from the position found by PATINDEX.
  • CHARINDEX(' ', your_column + ' ', ...) finds the position of the next space character after the extracted substring.
  • The extracted substring is the number you want.

This query will extract the first positive or negative number it finds in each string in the your_column column. If you have multiple numbers in a single string and you want to extract all of them, you might need a more complex solution, such as using a recursive Common Table Expression (CTE) or a user-defined function, depending on your database system.

Examples

  1. SQL query to extract negative numbers from a string

    Description: This query retrieves negative numbers from a string using regular expressions in SQL.

    SELECT regexp_matches('Your string with -12.5 and -8.3', '-\d+(\.\d+)?') AS negative_numbers;

  2. SQL query to extract positive numbers from a string

    Description: This query retrieves positive numbers from a string using regular expressions in SQL.

    SELECT regexp_matches('Your string with 12.5 and 8.3', '\b\d+(\.\d+)?\b') AS positive_numbers;

  3. SQL query to extract both positive and negative numbers from a string

    Description: This query retrieves both positive and negative numbers from a string using regular expressions in SQL.

    SELECT regexp_matches('Your string with -12.5, 8.3, and -5.2', '-?\d+(\.\d+)?') AS numbers;

  4. SQL query to separate positive and negative numbers from a string into different columns

    Description: This query separates positive and negative numbers from a string into different columns using regular expressions in SQL.

    SELECT regexp_matches('Your string with -12.5, 8.3, and -5.2', '-\d+(\.\d+)?') AS negative_numbers, regexp_matches('Your string with -12.5, 8.3, and -5.2', '\b\d+(\.\d+)?\b') AS positive_numbers;

  5. SQL query to count negative numbers in a string

    Description: This query counts the occurrence of negative numbers in a string using regular expressions in SQL.

    SELECT COUNT(*) AS negative_number_count FROM regexp_matches('Your string with -12.5, 8.3, and -5.2', '-\d+(\.\d+)?');

  6. SQL query to count positive numbers in a string

    Description: This query counts the occurrence of positive numbers in a string using regular expressions in SQL.

    SELECT COUNT(*) AS positive_number_count FROM regexp_matches('Your string with -12.5, 8.3, and -5.2', '\b\d+(\.\d+)?\b');

  7. SQL query to sum all negative numbers in a string

    Description: This query calculates the sum of all negative numbers in a string using regular expressions in SQL.

    SELECT SUM(CAST(n AS DECIMAL)) FROM regexp_matches('Your string with -12.5, 8.3, and -5.2', '-\d+(\.\d+)?') AS m(n);

  8. SQL query to sum all positive numbers in a string

    Description: This query calculates the sum of all positive numbers in a string using regular expressions in SQL.

    SELECT SUM(CAST(n AS DECIMAL)) FROM regexp_matches('Your string with -12.5, 8.3, and -5.2', '\b\d+(\.\d+)?\b') AS m(n);

  9. SQL query to find the maximum negative number in a string

    Description: This query finds the maximum negative number in a string using regular expressions in SQL.

    SELECT MAX(CAST(n AS DECIMAL)) FROM regexp_matches('Your string with -12.5, 8.3, and -5.2', '-\d+(\.\d+)?') AS m(n);

  10. SQL query to find the maximum positive number in a string

    Description: This query finds the maximum positive number in a string using regular expressions in SQL.

    SELECT MAX(CAST(n AS DECIMAL)) FROM regexp_matches('Your string with -12.5, 8.3, and -5.2', '\b\d+(\.\d+)?\b') AS m(n);

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