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Advanced SQL Questions

Home > Technical Aptitude > PL/SQL > Advanced SQL > General Questions
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What type of join is needed when you wish to return rows that do have matching values?


AEqui-join

BNatural join

COuter join

DAll of the above.

Answer: Option D

Explanation:

Here is no explanation for this answer

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Which of the following is a correlated subquery?


AUses the result of an inner query to determine the processing of an outer query.

BUses the result of an outer query to determine the processing of an inner query.

CUses the result of an inner query to determine the processing of an inner query.

DUses the result of an outer query to determine the processing of an outer query.

Answer: Option B

Explanation:

Here is no explanation for this answer

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The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T ;


AEqui-join

BNatural join

COuter join

DCartesian join

Answer: Option D

Explanation:

Here is no explanation for this answer

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The joining technique is useful when data from several relations are to be retrieved and displayed and the relationships are not necessarily nested.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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Which of the following statements is true concerning routines and triggers?


ABoth consist of procedural code.

BBoth have to be called to operate.

CBoth run automatically.

DBoth are stored in the database.

Answer: Option A

Explanation:

Here is no explanation for this answer

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There should be one condition within the WHERE clause for each pair of tables being joined.


ATRUE

BFALSE

Answer: Option A

Explanation:

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Subqueries can be nested multiple times.


ATRUE

BFALSE

Answer: Option A

Explanation:

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Which of the following statements is true concerning subqueries?


AInvolves the use of an inner and outer query.

BCannot return the same result as a query that is not a subquery.

CDoes not start with the word SELECT.

DAll of the above.

Answer: Option A

Explanation:

Here is no explanation for this answer

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Which of the following is one of the basic approaches for joining tables?


ASubqueries

BUnion Join

CNatural join

DAll of the above

Answer: Option D

Explanation:

Here is no explanation for this answer

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Embedded SQL is which of the following?


AHard-coded SQL statements in a program language such as Java

BThe process of making an application capable of generating specific SQL code on the fly.

CHard-coded SQL statements in a procedure.

DHard-coded SQL statements in a trigger.

Answer: Option A

Explanation:

Here is no explanation for this answer

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