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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. 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.
AS
AVG()
FROM
SELECT *

2. Simplest type of subquery.
SQL Statement and Case
HAVING
Simple Subquery
Use of Whitespace

3. Used to select all the information in a specified column.
DISTINCT
Simple Subquery
SELECT *
SELECT

4. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
SQL extensions
DESC
IN
char(size)

5. SQL statements are case- insensitive
HAVING
DBMS - Database Management System
DESC
SQL Statement and Case

6. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
DELETE
mysql
Nested Subquery
LIKE

7. All extra whitespace within a SQL statement is is ignored when that statement is processed.
varchar(size)
Use of Whitespace
SQL Statement and Case
COUNT()

8. Primary way to do a query in SQL
Table
SELECT Statement
Self-Join
Logical Operators

9. Limits the rows that appear in the result to those matching a specified condition
char(size)
SQL Statement and Case
DISTINCT
WHERE

10. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
UPDATE
MAX()
Comparison Operators
DESC

11. Method used to copy multiple records at one time using a SELECT statement
Use of Whitespace
INSERT INTO
Commas
varchar(size)

12. A record in a table
Always define Primary Keys
Terminating Statements
Row
Breaking up data

13. Database software (an application)
DBMS - Database Management System
HAVING
SQL extensions
Aggregate Functions

14. A popular open source database
mysql
Simple Subquery
Primary Key
Use of Whitespace

15. Lets you change the values in one or more selected rows of a table.
UPDATE
SELECT Statement
SQL (Structured Query Language)
Aggregate Functions

16. _______ column name FROM table name
Column
SELECT
ASC
UPDATE

17. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
Column
DISTINCT
Terminating Statements

18. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
ORDER BY
DISTINCT
Comparison Operators
Datatype

19. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
AVG()
Table
Use of Whitespace
Breaking up data

20. SQL is a language NOT an _______
MIN()
Self-Join
IN
application

21. NOT - AND - OR
Logical Operators
number(size -d)
DESC
LIKE

22. Allows you to delete selected rows.
DELETE
mysql
char(size)
WHERE

23. Multiple SQL statements must be separated by semicolons.
IN
Terminating Statements
char(size)
DELETE

24. Denotes that the search condition is TRUE for at least one element that the subquery returns.
IN
UPDATE
SUM()
ANY

25. Used to nest subqueries within another subquery.
SUM()
SQL extensions
Nested Subquery
MAX()

26. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Datatype
Nested Subquery
Aggregate Functions
SQL Statement and Case

27. Ascending
COUNT()
Column
Nested Subquery
ASC

28. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
MAX()
MIN()
DISTINCT
Nested Subquery

29. A structured list of data of a specific type
UPDATE
Table
SQL Statement and Case
mysql

30. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Use of Whitespace
DESC
Commas
Comparison Operators

31. Provides a numerical tally of how many rows meet a specific set of criteria.
AVG()
COUNT()
ANY
WHERE

32. 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.
Column
Comparison Operators
Always define Primary Keys
Primary Key

33. COUNT() - MAX() - MIN() - SUM() and AVG()
SQL Statement and Case
Aggregate Functions
HAVING
Table

34. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
DISTINCT
varchar(size)
WHERE
mysql

35. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
Logical Operators
AS
Self-Join
DELETE

36. Specifies the tables or views from which rows and columns are retrieved
SELECT *
FROM
Comparison Operators
Self-Join

37. The container - usually a file or set of files - to store organized data
UPDATE
Database
SQL extensions
mysql

38. Limits the output of the established groups into the derived result group.
HAVING
Use of Whitespace
Column
MAX()

39. Alias
SUM()
SQL Statement and Case
SELECT Statement
AS

40. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
LIKE
Use of Whitespace
Keyword
MIN()

41. Descending
varchar(size)
IN
DESC
char(size)

42. A single field in a table. All tables are made up of one or more columns.
DISTINCT
number(size -d)
Column
Primary Key

43. A column or set of columns whose values uniquely identify every row in a table.
Aggregate Functions
Column
UPDATE
Primary Key

44. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
ORDER BY
SUM()
char(size)
GROUP BY

45. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
Nested Subquery
char(size)
Database
Comparison Operators

46. Specify one or more columns on which to order the display.
Use of Whitespace
ORDER BY
SELECT Statement
mysql

47. Allows a comparison with multiple values from a list.
Primary Key
IN
SELECT *
HAVING

48. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
UPDATE
Database
SELECT *
number(size -d)

49. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
Use of Whitespace
DBMS - Database Management System
SUM()
SELECT Statement

50. A language designed specifically for communicating with databases.
SQL (Structured Query Language)
SQL extensions
WHERE
Nested Subquery