The _______ operator takes the results of two queries and returns only rows that appear in both result sets.
Union
Intersect
Difference
Projection
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1
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Using which language can a user request information from a database?
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2
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A domain is atomic if elements of the domain are considered to be ____________ units.
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3
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A relational database consists of a collection of
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4
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A ________ is a pictorial depiction of the schema of a database that shows the relations in the database, their attributes, and primary keys and foreign keys.
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5
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The _________ provides a set of operations that take one or more relations as input and return a relation as an output.
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6
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In SQL the spaces at the end of the string are removed by _______ function.
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7
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The most commonly used operation in relational algebra for projecting a set of tuple from a relation is
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8
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_____ operator is used for appending two strings.
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9
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For each attribute of a relation, there is a set of permitted values, called the ________ of that attribute.
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10
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In the SQL given above there is an error . Identify the error.
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