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To get all columns and rows of a table without typing all columns we can use *. Thus SELECT * FROM Cars; The WHERE clause (conditional selection) is used to specify that only certain rows of the table are displayed, based on the criteria described in that WHERE clause. Example 2. We select from table Employee the Last_Name and Car_Number when the First_Name is Sean SELECT Last_Name, Car_Number FROM Employees WHERE First_Name = ’Sean’; The result set (output) is Last_Name Car_Number -----------------Smith null ---------------------Example 3.

A second integrity rule is that column values cannot be repeating groups or arrays. A third aspect of data integrity involves the concept of a null value. A database has to take care of situations where data may not be available: a null value indicates that a value is missing. It does not equate to a blank or zero. A blank is considered equal to another blank, a zero is equal to another zero, but two null values are not considered equal. When each row in a table is different, it is possible to use one or more columns to identify a particular row.

The class HashSet stores its elements in a hash table. The class TreeSet stores its elements in a red-black tree. This guarantees the order of iteration. The following program shows an application of the TreeSet class. 4. 00, Java, Solms] S5 = [C++, Steeb] b4 = false b = true b = true Other methods are int size() which returns the number of elements in this set (its cardinality) and boolean isEmpty() returns true if this set contains no elements. 5 CHAPTER 2. STRUCTURED QUERY LANGUAGE Views We use the CREATE VIEW statement to create a new view with its definition based upon a current table or another view of the database.

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