position Function in TERADATA

In Teradata, the POSITION function is used to find the position of a substring within a string. It is similar to the CHARINDEX function in SQL Server. The POSITION function returns an integer value representing the position of the first occurrence of the substring within the string. If the substring is not found, it returns 0.

Here's the syntax of the POSITION function in Teradata:

POSITION(substring IN string)

- substring: The substring to search for within the string.

- string: The string in which to search for the substring.

Example:

SELECT POSITION('world' IN 'hello world') AS position;

This will return 7, indicating that the substring 'world' starts at the 7th position within the string 'hello world'.

Here are 5 FAQ's and it's answers:-

1. Does the POSITION function in Teradata perform a case-sensitive or case-insensitive search?

   - By default, the POSITION function in Teradata performs a case-sensitive search. If you need a case-insensitive search, you can use the `UPPER()` or `LOWER()` functions to convert both the substring and the string to the same case before using the POSITION function.

2. Can the POSITION function return the position of the last occurrence of a substring within a string in Teradata?

   - No, the POSITION function in Teradata returns the position of the first occurrence of the substring within the string. There isn't a built-in function specifically for finding the position of the last occurrence, but you can use other string manipulation functions to achieve this.

3. What happens if the substring is not found within the string when using the POSITION function in Teradata?

   - If the substring is not found within the string, the POSITION function returns 0.

4. Can I use wildcards or regular expressions with the substring parameter of the POSITION function in Teradata?

   - No, the POSITION function in Teradata does not support wildcards or regular expressions. It only searches for the exact substring within the string.

5. Does the POSITION function support searching for multiple substrings within a single string in Teradata?

   - No, the POSITION function in Teradata only returns the position of the first occurrence of the substring within the string. If you need to find multiple occurrences, you would need to use the POSITION function in combination with other string manipulation functions or use a different approach altogether.