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DAT 380 Wk 4 - Practice: Knowledge Check

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DAT 380 Wk 4 - Practice: Knowledge Check

The special operator used to check whether a subquery returns any rows is _____.

  • IN
  • EXISTS
  • BETWEEN
  • LIKE

 

ANSI-standard SQL allows the use of special operators in conjunction with the WHERE clause.

  • True
  • False

 

You can select partial table contents by naming the desired fields and by placing restrictions on the rows to be included in the output.

  • True
  • False

 

A database language enables the user to perform complex queries designed to transform the raw data into useful information.

  • True
  • False

 

Which query is used to list a unique value for V_CODE, where the list will produce only a list of those values that are different from one another?

  • SELECT UNIQUE V_CODE

 

FROM PRODUCT;

  • SELECT DISTINCT V_CODE

 

FROM PRODUCT;

  • SELECT DIFFERENT V_CODE

 

FROM PRODUCT;

  • SELECT ONLY V_CODE

 

FROM PRODUCT;

 

In Oracle, _____ make(s) it possible to merge SQL and traditional programming constructs, such as variables, conditional processing (IF-THEN-ELSE), basic loops (FOR and WHILE loops,) and error trapping.

  • Procedural Language SQL
  • embedded SQL
  • dynamic SQL
  • stored procedures

 

All changes in a table structure are made using the _____ TABLE command, followed by a keyword that produces the specific changes a user wants to make.

  • ALTER
  • UPDATE
  • ROLLBACK
  • COMMIT

 

The _____ constraint is used to validate data when an attribute value is entered.

  • UNIQUE
  • CASCADE
  • SET NULL
  • CHECK

 

_____ is a relational set operator.

  • EXISTS
  • ALL
  • PLUS
  • EXCEPT

 

The SQL data manipulation command HAVING:

  • restricts the selection of grouped rows based on a condition.
  • modifies an attribute's values in one or more table's rows.
  • groups the selected rows based on one or more attributes.
  • restricts the selection of rows based on a conditional expression.
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