Documentație
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COALESCE (Transact-SQL) - SQL Server
Transact-SQL reference for COALESCE, which returns the value of the first expression that doesn't evaluate to NULL.
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UNION (Transact-SQL) - SQL Server
Set Operators - UNION (Transact-SQL)
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ISNULL (Transact-SQL) - SQL Server
ISNULL replaces NULL with the specified replacement value.
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- (Unary negative) (Transact-SQL) - SQL Server
Returns the negative of the value of a numeric expression (a unary operator).