What Are Functions?3:12 with Andrew Chalkley
You've seen keywords and operators, now it's time to see a new concept in the SQL programming language: functions.
Keywords: Commands issued to a database. The data presented in queries is unaltered.
Operators: Performs comparisons and simple manipulation
Functions: Presents data differently through more complex manipulation
A function looks like:
<function name>(<value or column>)
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