This family of functions perform operations on a string input value, or binary input value (for certain functions), and return a string or numeric value.
Snowflake offers a range of string functions that can be used to manipulate and transform text data. Here are some commonly used string functions in Snowflake:
1. CONCAT: Concatenates two or more strings together.
Example: **`CONCAT('Hello', ' ', 'World')`** returns **`'Hello World'`**.
2. SUBSTRING: Extracts a portion of a string based on specified starting position and length.
Example: **`SUBSTRING('Snowflake', 3, 5)`** returns **`'owfla'`**.
3. LENGTH: Returns the number of characters in a string.
Example: **`LENGTH('Snowflake')`** returns **`9`**.
4. UPPER: Converts a string to uppercase.
Example: **`UPPER('snowflake')`** returns **`'SNOWFLAKE'`**.
5. LOWER: Converts a string to lowercase.
Example: **`LOWER('SNOWFLAKE')`** returns **`'snowflake'`**.
6. TRIM: Removes leading and trailing spaces from a string.
Example: **`TRIM(' Snowflake ')`** returns **`'Snowflake'`**.
7. REPLACE: Replaces occurrences of a substring within a string.
Example: **`REPLACE('Hello, World!', 'Hello', 'Hi')`** returns **`'Hi, World!'`**.
8. REGEXP_REPLACE: Replaces occurrences of a pattern within a string using regular expressions.
Example: **`REGEXP_REPLACE('Hello, World!', '[Hh]ello', 'Hi')`** returns **`'Hi, World!'`**.
9. SPLIT_PART: Extracts a specific portion of a string based on a delimiter and position.
Example: **`SPLIT_PART('John,Doe,42', ',', 2)`** returns **`'Doe'`**.
10. LENGTH: Returns the length of a string in bytes.
Example: **`LENGTH('Snowflake')`** returns **`9`**.
These are just a few examples of the string functions available in Snowflake. Snowflake provides many more functions like INSTR, LEFT, RIGHT, LPAD, RPAD, INITCAP, and others for various string manipulation tasks. The Snowflake documentation offers a comprehensive list of string functions with detailed explanations and usage examples.
