Exam (elaborations)
SANS GFACT SQL QUIZ QUESTIONS
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SANS GFACT SQL QUIZ QUESTIONS
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SANS GFACT SQL QUIZ QUESTIONSThe data in non-relational databases is structured, just like relational databases. -
Answers- False - Non-relational databases are for use when the kind of data is not
known, and/or if the type of data changes frequently.
The 'WHERE' SQL command is used to filter data that meet certain criteria. - Answers-
True - The `WHERE` clause helps us to filter records to only the ones that match a
certain condition, i.e.the defined value within a database column
To select all data from a table, use the wild card character '!', exclamation point -
Answers- False - The asterisks '*' is the wild card character
When using the AS command, the renaming of the field is permanent - Answers- False
- The renaming of a field using the AS command only exists fo the duration of the SQL
query.
a LEFT JOIN includes matching results from the first table and all results from the
second table - Answers- False - the RIGHT JOIN command includes matching results
from the first table and all results from the second table
The first table in a LEFT JOIN will always have all of its records returned in the query no
matter what the condition of the join is - Answers- True
The first table to be joined is mentioned in the INNER JOIN clause. - Answers- False -
The second table to be joined is mentioned in the INNER JOIN clause.
Operators UNION, IN, LIKE and SOME are examples of Comparison operators -
Answers- False - These are Logical operators
When you execute a query that contains a subquery, the subquery is evaluated at the
same time as the query - Answers- False - The subquery is evaluated first and then the
result of that query is used in the enclosing query
The `EXISTS` operator checks for the existence of records in a subquery before the
subquery is evaluated - Answers- False - The 'EXISTS' operator evaluates subqueries
after all the subqueiries are evaluated
The UNION operator is used to emulate a FULL JOIN, not supported by MySQL -
Answers- True
The CONSTRAINTS operator is used to define rules for a field in a table - Answers-
False - There is no CONSTRAINT operator, rather we use commands like FOREIGN
KEY, PRIMARY KEY or REFERENCES
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