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This SQL tutorial explains how to use the SQL EXISTS condition with syntax and examples. Click the Try It button next to an example to test it for yourself in our SQL Editor. The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row.
The complete syntax depends on the database engine you're working with: For SQL Server: or: expressions, etc: Link: CASE (Transact-SQL). Also note that the ordering of the WHEN statements is important. You can easily write multiple WHEN clauses that overlap, and the first one that matches is used. Note: If no ELSE clause is specified, and no matching WHEN-condition is found, the value of the CASE expression will be NULL.