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SQL Update from SELECT Methods

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Main Methods: UPDATE from SELECT is possible in SQL Server 2008+ using MERGE
UPDATE with CTE provides readable alternative to traditional UPDATE syntax
SELECT statements can be used to preview updates before execution
Implementation Details: Aliases are required when updating tables with same column names
WHERE clause is necessary to avoid unnecessary updates
Aggregates can be included in SELECT subqueries
Inner join can be used for updating tables with common fields
Database-Specific Notes: MySQL and MariaDB use different syntax with USING keyword
SQL Server 12 updates always use same value regardless of target row
UPDATE can be performed without join if tables have no common fields
Rollback transactions recommended for testing updates before execution