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The sub-query can refer to old values of the current row of the table being updated.you should ensure that the join produces at most one output row for each row to be modified.For more information about predicates and search conditions, see Search Condition (Transact-SQL). For more information, see SET ANSI_PADDING (Transact-SQL).CURRENT OF Specifies that the update is performed at the current position of the specified cursor. Modifying a text, ntext, or image column with UPDATE initializes the column, assigns a valid text pointer to it, and allocates at least one data page, unless the column is being updated with NULL.
TOP ( ) Specifies one or more table hints that are allowed for a target table. @ Note When referencing the Unicode character data types nchar, nvarchar, and ntext, 'expression' should be prefixed with the capital letter 'N'.For more information, see OUTPUT Clause (Transact-SQL).FROM Specifies that a table, view, or derived table source is used to provide the criteria for the update operation. If the object being updated is the same as the object in the FROM clause and there is only one reference to the object in the FROM clause, an object alias may or may not be specified.DEFAULT Specifies that the default value defined for the column is to replace the existing value in the column.This can also be used to change the column to NULL if the column has no default and is defined to allow null values.