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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. Simplest type of subquery.
mysql
SELECT
varchar(size)
Simple Subquery

2. COUNT() - MAX() - MIN() - SUM() and AVG()
SELECT
Self-Join
IN
Aggregate Functions

3. Variable-length character string. Max size is specified in parenthesis.
Breaking up data
varchar(size)
DELETE
ASC

4. Specify one or more columns on which to order the display.
varchar(size)
SQL (Structured Query Language)
SQL extensions
ORDER BY

5. Method used to copy multiple records at one time using a SELECT statement
Breaking up data
INSERT INTO
mysql
Self-Join

6. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Comparison Operators
Aggregate Functions
Use of Whitespace
Keyword

7. Limits the output of the established groups into the derived result group.
number(size -d)
char(size)
Table
HAVING

8. Primary way to do a query in SQL
Self-Join
COUNT()
SELECT Statement
Commas

9. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
IN
DELETE
Keyword
SQL (Structured Query Language)

10. Ascending
ASC
Column
Self-Join
SELECT *

11. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
SUM()
char(size)
LIKE
Keyword

12. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
MIN()
Always define Primary Keys
Self-Join
AVG()

13. 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.
Always define Primary Keys
SELECT *
Commas
DISTINCT

14. A record in a table
SQL Statement and Case
Terminating Statements
Row
SELECT

15. Denotes that the search condition is TRUE for at least one element that the subquery returns.
SQL Statement and Case
COUNT()
Use of Whitespace
ANY

16. NOT - AND - OR
SELECT Statement
ANY
Logical Operators
WHERE

17. Specifies the tables or views from which rows and columns are retrieved
Use of Whitespace
Datatype
FROM
Row

18. Alias
AS
DESC
LIKE
mysql

19. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
SQL Statement and Case
Primary Key
Self-Join
LIKE

20. SQL is a language NOT an _______
COUNT()
application
AVG()
Terminating Statements

21. Limits the rows that appear in the result to those matching a specified condition
WHERE
MAX()
DELETE
Breaking up data

22. Database software (an application)
DBMS - Database Management System
LIKE
Row
Terminating Statements

23. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
ASC
Comparison Operators
Table
SELECT Statement

24. A structured list of data of a specific type
COUNT()
Table
Terminating Statements
Keyword

25. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Datatype
SQL extensions
DELETE
SELECT

26. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
SUM()
Nested Subquery
DISTINCT
mysql

27. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
DISTINCT
SELECT Statement
Commas
INSERT INTO

28. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
SELECT Statement
SUM()
AVG()
Self-Join

29. Provides a numerical tally of how many rows meet a specific set of criteria.
Column
Datatype
COUNT()
SUM()

30. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
Primary Key
DISTINCT
Database
MAX()

31. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
varchar(size)
Column
MAX()
SQL extensions

32. Allows a comparison with multiple values from a list.
WHERE
IN
ORDER BY
Primary Key

33. Lets you change the values in one or more selected rows of a table.
Column
COUNT()
UPDATE
char(size)

34. Used to nest subqueries within another subquery.
Nested Subquery
SUM()
Use of Whitespace
WHERE

35. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
ASC
number(size -d)
HAVING
MAX()

36. SQL statements are case- insensitive
Primary Key
Commas
varchar(size)
SQL Statement and Case

37. _______ column name FROM table name
SELECT
ANY
Self-Join
Database

38. 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.
DBMS - Database Management System
GROUP BY
AVG()
Datatype

39. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Simple Subquery
Breaking up data
LIKE
Always define Primary Keys

40. Allows you to delete selected rows.
char(size)
ANY
SELECT
DELETE

41. Multiple SQL statements must be separated by semicolons.
Terminating Statements
Table
SUM()
varchar(size)

42. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
GROUP BY
DBMS - Database Management System
SQL extensions
Self-Join

43. Descending
DESC
Column
UPDATE
Breaking up data

44. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
number(size -d)
MAX()
Datatype
SQL extensions

45. A column or set of columns whose values uniquely identify every row in a table.
COUNT()
GROUP BY
Row
Primary Key

46. The container - usually a file or set of files - to store organized data
DELETE
Database
SELECT
ORDER BY

47. A language designed specifically for communicating with databases.
SQL extensions
Terminating Statements
SQL (Structured Query Language)
Aggregate Functions

48. Used to select all the information in a specified column.
Primary Key
UPDATE
SELECT *
Row

49. A popular open source database
MAX()
mysql
ORDER BY
Logical Operators

50. A single field in a table. All tables are made up of one or more columns.
IN
GROUP BY
Column
Database