This is a Microsoft SQL tutorial covering the CHARINDEX function. It explains how the function works and provides demonstrations on the solutions that can be achieved by using this function.
Other functions in this video include: LEFT, RIGHT and LEN.

Complimentary videos
LEFT/RIGHT functions – https://youtu.be/BlxBrknOkMM
LEN (and other functions) – https://youtu.be/Za2UbTXvxLI