What is the CASE() function in mysql?
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The way to implement the if-then-else logic in SQL. This function sequentially checks the provided conditions in the WHEN clauses and returns the value from the corresponding THEN clause when the first condition is satisfied. If none of the conditions is satisfied, the function returns the value from the ELSE clause in case it’s provided, otherwise, it returns NULL. The syntax is:
CASE
WHEN condition_1 THEN value_1
WHEN condition_2 THEN value_2
WHEN condition_3 THEN value_3
…
ELSE value
END;