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SQL: Structured Query Language

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Used to nest subqueries within another subquery.
Self-Join
MIN()
char(size)
Nested Subquery

2. Although primary keys are not specifically required - most database designers make certain that every table they create has a primary key so that future data manipulation is possible.
number(size -d)
Nested Subquery
FROM
Always define Primary Keys

3. SQL is a language NOT an _______
application
Primary Key
char(size)
DESC

4. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Commas
INSERT INTO
LIKE
ASC

5. Simplest type of subquery.
Self-Join
Simple Subquery
Breaking up data
UPDATE

6. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
Row
GROUP BY
IN

7. Allows you to delete selected rows.
DELETE
Simple Subquery
FROM
Use of Whitespace

8. SQL statements are case- insensitive
LIKE
MAX()
Use of Whitespace
SQL Statement and Case

9. Allows a comparison with multiple values from a list.
DESC
Database
ASC
IN

10. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Aggregate Functions
Breaking up data
ASC
AS

11. A record in a table
Row
DISTINCT
AVG()
SELECT Statement

12. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
DISTINCT
FROM
char(size)
AS

13. Specifies the tables or views from which rows and columns are retrieved
Simple Subquery
FROM
COUNT()
SQL extensions

14. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
Simple Subquery
Logical Operators
Use of Whitespace
LIKE

15. Descending
Aggregate Functions
DISTINCT
DESC
ANY

16. Denotes that the search condition is TRUE for at least one element that the subquery returns.
Aggregate Functions
ANY
Terminating Statements
number(size -d)

17. A language designed specifically for communicating with databases.
AVG()
MIN()
SQL (Structured Query Language)
Table

18. A popular open source database
mysql
Aggregate Functions
SELECT *
number(size -d)

19. Alias
SQL extensions
Datatype
Table
AS

20. Specify one or more columns on which to order the display.
UPDATE
ORDER BY
Primary Key
HAVING

21. The container - usually a file or set of files - to store organized data
Nested Subquery
SQL Statement and Case
Keyword
Database

22. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
Self-Join
Primary Key
Datatype
AVG()

23. Limits the rows that appear in the result to those matching a specified condition
DESC
Table
WHERE
ASC

24. Ascending
DISTINCT
GROUP BY
Terminating Statements
ASC

25. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Use of Whitespace
MAX()
FROM
mysql

26. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
varchar(size)
MIN()
AVG()
Keyword

27. COUNT() - MAX() - MIN() - SUM() and AVG()
SELECT Statement
Use of Whitespace
Aggregate Functions
Terminating Statements

28. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
Keyword
GROUP BY
SELECT Statement
HAVING

29. Limits the output of the established groups into the derived result group.
HAVING
Datatype
Simple Subquery
SQL extensions

30. A column or set of columns whose values uniquely identify every row in a table.
Primary Key
HAVING
DELETE
MIN()

31. Primary way to do a query in SQL
SELECT Statement
char(size)
Logical Operators
number(size -d)

32. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
number(size -d)
SUM()
Keyword
AVG()

33. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
Row
ANY
number(size -d)
SELECT *

34. A single field in a table. All tables are made up of one or more columns.
Column
SQL Statement and Case
varchar(size)
DBMS - Database Management System

35. Multiple SQL statements must be separated by semicolons.
Terminating Statements
Row
DISTINCT
SQL Statement and Case

36. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Datatype
MAX()
GROUP BY
AS

37. Method used to copy multiple records at one time using a SELECT statement
AS
INSERT INTO
Use of Whitespace
GROUP BY

38. Database software (an application)
DISTINCT
Nested Subquery
IN
DBMS - Database Management System

39. A structured list of data of a specific type
Table
Comparison Operators
DESC
Breaking up data

40. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
Database
Comparison Operators
Terminating Statements
Logical Operators

41. Used to select all the information in a specified column.
Logical Operators
Always define Primary Keys
SELECT *
COUNT()

42. _______ column name FROM table name
Comparison Operators
varchar(size)
SELECT
DELETE

43. NOT - AND - OR
Database
varchar(size)
Logical Operators
SELECT

44. Takes average of each of the numeric values in the column.Can only be used in conjuction with the DISTINCT keyword and only works on numeric columns.
Commas
GROUP BY
Use of Whitespace
AVG()

45. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
application
Nested Subquery
SQL extensions
AVG()

46. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
MIN()
AS
UPDATE
Column

47. Lets you change the values in one or more selected rows of a table.
DISTINCT
ORDER BY
LIKE
UPDATE

48. Provides a numerical tally of how many rows meet a specific set of criteria.
COUNT()
SQL (Structured Query Language)
number(size -d)
Simple Subquery

49. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
SQL (Structured Query Language)
SELECT *
MAX()
AS

50. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
FROM
DBMS - Database Management System
DISTINCT
SELECT *