Updating rows using select into
Figure 4–9 The syntax for the DISTINCT keyword As the diagram illustrates, DISTINCT is an optional keyword that precedes the list of columns specified in the SELECT clause.The DISTINCT keyword asks your database system to evaluate the values of all the columns as a single unit on a row-by-row basis and eliminate any redundant rows it finds.
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When working with SELECT statements, you'll inevitably come across result sets with duplicate rows.
There is no cause for alarm if you see such a result set.
The remaining unique rows are then returned to the result set.
The following example shows what a difference the DISTINCT keyword can make under the appropriate circumstances.You resolve this problem by using the DISTINCT keyword in the SELECT statement to eliminate the redundant information.
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