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. SQL is a language NOT an _______
AVG()
application
Self-Join
WHERE

2. Ascending
ASC
AVG()
application
Keyword

3. Allows a comparison with multiple values from a list.
IN
application
varchar(size)
char(size)

4. COUNT() - MAX() - MIN() - SUM() and AVG()
SELECT *
Aggregate Functions
Datatype
LIKE

5. Simplest type of subquery.
SUM()
DBMS - Database Management System
Simple Subquery
mysql

6. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
Database
DISTINCT
Always define Primary Keys
MIN()

7. Specify one or more columns on which to order the display.
Terminating Statements
UPDATE
ORDER BY
GROUP BY

8. Specifies the tables or views from which rows and columns are retrieved
Breaking up data
Use of Whitespace
FROM
mysql

9. A language designed specifically for communicating with databases.
Breaking up data
application
Terminating Statements
SQL (Structured Query Language)

10. A popular open source database
AVG()
char(size)
Logical Operators
mysql

11. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
Use of Whitespace
mysql
IN
SUM()

12. Multiple SQL statements must be separated by semicolons.
ASC
MIN()
AS
Terminating Statements

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.
number(size -d)
Self-Join
Always define Primary Keys
Keyword

14. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Column
IN
Datatype
Keyword

15. _______ column name FROM table name
Use of Whitespace
UPDATE
SELECT
GROUP BY

16. SQL statements are case- insensitive
SQL extensions
varchar(size)
Use of Whitespace
SQL Statement and Case

17. A column or set of columns whose values uniquely identify every row in a table.
Nested Subquery
Primary Key
GROUP BY
Logical Operators

18. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
UPDATE
Primary Key
Datatype

19. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
Logical Operators
number(size -d)
SQL Statement and Case
mysql

20. Primary way to do a query in SQL
Primary Key
SQL Statement and Case
SELECT Statement
application

21. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Breaking up data
AVG()
UPDATE
Nested Subquery

22. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Aggregate Functions
Commas
WHERE
SELECT Statement

23. Limits the output of the established groups into the derived result group.
Use of Whitespace
AS
Row
HAVING

24. A structured list of data of a specific type
Breaking up data
Table
Aggregate Functions
SQL extensions

25. Alias
varchar(size)
COUNT()
Nested Subquery
AS

26. A record in a table
HAVING
application
Breaking up data
Row

27. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
INSERT INTO
MIN()
GROUP BY
ASC

28. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
char(size)
Always define Primary Keys
ASC
Logical Operators

29. Allows you to delete selected rows.
DELETE
LIKE
INSERT INTO
WHERE

30. Database software (an application)
MAX()
number(size -d)
DBMS - Database Management System
MIN()

31. A single field in a table. All tables are made up of one or more columns.
HAVING
Column
Aggregate Functions
MAX()

32. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
SUM()
varchar(size)
MAX()
AVG()

33. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
SQL Statement and Case
SQL extensions
Keyword
Table

34. Used to select all the information in a specified column.
varchar(size)
Self-Join
DISTINCT
SELECT *

35. Used to nest subqueries within another subquery.
Aggregate Functions
Nested Subquery
ORDER BY
DISTINCT

36. Lets you change the values in one or more selected rows of a table.
UPDATE
DBMS - Database Management System
SUM()
Use of Whitespace

37. Limits the rows that appear in the result to those matching a specified condition
WHERE
MIN()
number(size -d)
varchar(size)

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

39. NOT - AND - OR
Table
Aggregate Functions
Commas
Logical Operators

40. The container - usually a file or set of files - to store organized data
mysql
Database
Use of Whitespace
SQL extensions

41. Descending
DESC
Self-Join
SQL (Structured Query Language)
WHERE

42. Denotes that the search condition is TRUE for at least one element that the subquery returns.
MAX()
ANY
COUNT()
Primary Key

43. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
SELECT
mysql
FROM
Keyword

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.
AVG()
Column
Keyword
mysql

45. Provides a numerical tally of how many rows meet a specific set of criteria.
Keyword
COUNT()
DBMS - Database Management System
SUM()

46. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
DBMS - Database Management System
SELECT Statement
LIKE
Datatype

47. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Use of Whitespace
ASC
Simple Subquery
char(size)

48. Method used to copy multiple records at one time using a SELECT statement
Comparison Operators
FROM
LIKE
INSERT INTO

49. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
Commas
Row
GROUP BY
Comparison Operators

50. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
DISTINCT
DELETE
SQL extensions
AVG()