Sql updating table values

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The second syntactical form, called a positioned update, updates one or more columns on the current row of an open, updatable cursor.Before reading this post you may want to get familiar with our post about SQL INSERT Statement.ROLLBACK is a command that can bring the state of the data a step back, but not more than that.If columns were specified in the FOR UPDATE clause of the SELECT statement used to generate the cursor, only those columns can be updated.If no columns were specified or the select statement did not include a FOR UPDATE clause, all columns may be updated.

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