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SQL Essentials: DECODE Function Explained
Overview
The DECODE formula acts as an if/then function where the first parameter is evaluated. If it matches the second parameter then it will display the third parameter.
Imagine you have a list of items and you want to quickly categorize them based on certain rules. The DECODE function is like a smart assistant that helps you do just that. It looks at a piece of information (called the "expression") and checks if it matches any of the values you provide. If it finds a match, it assigns a corresponding category or value.
In simple terms, DECODE says, "If this equals that, then call it 'X'." It keeps checking until it finds a match or runs out of options, in which case it might give you a default answer.