Test your basic knowledge |

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. A column or set of columns whose values uniquely identify every row in a table.
Datatype
ORDER BY
Primary Key
MAX()

2. The container - usually a file or set of files - to store organized data
COUNT()
MAX()
Database
Simple Subquery

3. COUNT() - MAX() - MIN() - SUM() and AVG()
Nested Subquery
Primary Key
INSERT INTO
Aggregate Functions

4. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Breaking up data
Commas
ANY
SQL extensions

5. Multiple SQL statements must be separated by semicolons.
Terminating Statements
mysql
Logical Operators
INSERT INTO

6. 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.
Aggregate Functions
number(size -d)
DBMS - Database Management System
Always define Primary Keys

7. SQL is a language NOT an _______
application
AS
Use of Whitespace
Always define Primary Keys

8. Limits the rows that appear in the result to those matching a specified condition
WHERE
Aggregate Functions
Keyword
DISTINCT

9. Primary way to do a query in SQL
Row
Keyword
SQL (Structured Query Language)
SELECT Statement

10. Allows you to delete selected rows.
char(size)
AVG()
Use of Whitespace
DELETE

11. Provides a numerical tally of how many rows meet a specific set of criteria.
COUNT()
Commas
Simple Subquery
AVG()

12. A single field in a table. All tables are made up of one or more columns.
DESC
SUM()
SQL extensions
Column

13. Specifies the tables or views from which rows and columns are retrieved
ASC
FROM
Column
IN

14. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
Keyword
Always define Primary Keys
DESC
Column

15. A structured list of data of a specific type
Table
Row
mysql
SELECT Statement

16. Used to nest subqueries within another subquery.
Nested Subquery
char(size)
Aggregate Functions
Primary Key

17. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
SELECT *
Nested Subquery
SUM()
Simple Subquery

18. Database software (an application)
Keyword
Column
DBMS - Database Management System
Always define Primary Keys

19. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
Terminating Statements
SQL extensions
ORDER BY
DELETE

20. Denotes that the search condition is TRUE for at least one element that the subquery returns.
MAX()
ANY
char(size)
GROUP BY

21. 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.
Keyword
ASC
Aggregate Functions
AVG()

22. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
SQL extensions
Breaking up data
MIN()
LIKE

23. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
SQL (Structured Query Language)
varchar(size)
MIN()
Nested Subquery

24. Allows a comparison with multiple values from a list.
Column
GROUP BY
SQL extensions
IN

25. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
Database
GROUP BY
MAX()
UPDATE

26. A record in a table
Aggregate Functions
SELECT Statement
DBMS - Database Management System
Row

27. Alias
AVG()
AS
Column
DESC

28. Used to select all the information in a specified column.
DESC
IN
Simple Subquery
SELECT *

29. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
ANY
AS
Comparison Operators
COUNT()

30. Lets you change the values in one or more selected rows of a table.
MAX()
INSERT INTO
UPDATE
SQL Statement and Case

31. Simplest type of subquery.
LIKE
Logical Operators
Simple Subquery
ASC

32. Limits the output of the established groups into the derived result group.
Always define Primary Keys
HAVING
varchar(size)
MAX()

33. NOT - AND - OR
LIKE
GROUP BY
Logical Operators
FROM

34. Specify one or more columns on which to order the display.
SELECT
Self-Join
ORDER BY
IN

35. SQL statements are case- insensitive
GROUP BY
Breaking up data
SQL Statement and Case
MIN()

36. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
char(size)
Aggregate Functions
Comparison Operators
number(size -d)

37. Descending
Logical Operators
Row
DELETE
DESC

38. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
DISTINCT
SQL extensions
WHERE
Breaking up data

39. A popular open source database
HAVING
SELECT
mysql
Primary Key

40. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
Aggregate Functions
FROM
char(size)

41. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
IN
MAX()
Logical Operators
Self-Join

42. Method used to copy multiple records at one time using a SELECT statement
MIN()
Keyword
INSERT INTO
ORDER BY

43. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Commas
HAVING
AS
ORDER BY

44. A language designed specifically for communicating with databases.
SQL (Structured Query Language)
FROM
DISTINCT
SELECT Statement

45. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
ASC
Self-Join
Keyword
DELETE

46. _______ column name FROM table name
WHERE
UPDATE
ASC
SELECT

47. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Breaking up data
MAX()
HAVING
Datatype

48. Ascending
ASC
Primary Key
SELECT *
AS

49. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Always define Primary Keys
AS
Simple Subquery
Use of Whitespace

50. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
char(size)
IN
Keyword
HAVING