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Advanced SQL
How many tables may be included with a join?
One
Two
Three
All of the above.
Correct Answer:
All of the above.
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Advanced SQL
Which of the following is a correlated subquery?
The joining technique is useful when data from several relations are to be retrieved and displayed and the relationships are not necessarily nested.
There should be one condition within the WHERE clause for each pair of tables being joined.
A transaction is the complete set of closely related update commands that must all be done, or none of them done, for the database to remain valid.
A correlated subquery is where the outer query depends on data from the inner query.
The code to create triggers and routines is stored in only one location and is administered centrally.
A function returns one value and has only output parameters.
When AUTOCOMMIT is set on, changes will be made automatically at the end of each SQL statement.
With the UNION clause, each query involved must output the same number of columns, and they must be UNION compatible.
The most frequently used relational operation, which brings together data from two or more related tables into one resultant table, is called an equi-join.
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