![]() Message-Oriented Communication in Distributed Computing Unhealthy Air Quality for Sensitive Groups What is considered Fine Particulate Matter?Īir Quality Meaning? How Is Air Quality Measured? What are the Two Causes of Air Pollution? What are the 3 Types of Pollution and their effects? What are the Sources of Environmental Pollution? Using the _ clause retains only one copy of such identical tuples. In an employee table to include the attributes whose value always have some value which of the following constraint must be used?Ģ0. The result of true and unknown is_ false and unknown is _ while unknown and unknown is _ġ9. The predicate in a where clause can involve Boolean operations such as and. ![]() If the attribute phone number is included in the relation all the values need not be entered into the phone number column. ![]() A _ indicates an absent value that may exist but be unknown or that may not exist at all.ġ7. The _ is essentially used to search for patterns in target string.ġ6. _ clause is an additional filter that is applied to the result.ġ4. The number of attributes in relation is called as itsġ3. If we want to retain all duplicates, we must write _ in place of union.ġ2. The union operation automatically _ unlike the select clause.ġ1.
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