Is there a LEFT function in kql?

In SQL, in order to grab n characters from the left side of a string, you can use the LEFT function:

SELECT LEFT('Hello World', 5)
-- "Hello"

There doesn't appear to be a left or right function in the docs on scalar functions:

Q: How do you do select left most characters in KQL?

You can use the substring function:

substring(source, startingIndex [, length])

LEFT

SQL: SELECT LEFT('Hello World', 5)
KQL: print substring("Hello World", 0, 5)

RIGHT

SQL: SELECT RIGHT('Hello World', 5)
KQL: print substring("Hello World", -5, 5)