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. Descending
SQL (Structured Query Language)
DESC
HAVING
SQL Statement and Case

2. A language designed specifically for communicating with databases.
DELETE
SQL (Structured Query Language)
SELECT
Commas

3. A structured list of data of a specific type
Table
SQL (Structured Query Language)
MAX()
DELETE

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

5. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
SUM()
Simple Subquery
Table
Datatype

6. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
UPDATE
DESC
Comparison Operators
ASC

7. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
DELETE
SQL extensions
DESC
DBMS - Database Management System

8. Provides a numerical tally of how many rows meet a specific set of criteria.
COUNT()
Column
GROUP BY
Use of Whitespace

9. Ascending
DBMS - Database Management System
SUM()
MIN()
ASC

10. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
Logical Operators
FROM
char(size)
SELECT Statement

11. Specifies the tables or views from which rows and columns are retrieved
MIN()
char(size)
FROM
IN

12. A single field in a table. All tables are made up of one or more columns.
Comparison Operators
mysql
Column
SELECT

13. Primary way to do a query in SQL
SELECT Statement
SUM()
Commas
Datatype

14. SQL statements are case- insensitive
Table
SQL Statement and Case
SUM()
DESC

15. COUNT() - MAX() - MIN() - SUM() and AVG()
Aggregate Functions
Terminating Statements
Keyword
GROUP BY

16. A column or set of columns whose values uniquely identify every row in a table.
mysql
Primary Key
SQL (Structured Query Language)
SUM()

17. Simplest type of subquery.
application
Use of Whitespace
COUNT()
Simple Subquery

18. Alias
mysql
AS
Row
DESC

19. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Datatype
Database
number(size -d)
application

20. 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.
MAX()
Simple Subquery
AVG()
DESC

21. All extra whitespace within a SQL statement is is ignored when that statement is processed.
DBMS - Database Management System
Comparison Operators
Use of Whitespace
UPDATE

22. 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.
UPDATE
char(size)
Datatype
Always define Primary Keys

23. Used to select all the information in a specified column.
ANY
Column
SELECT *
DBMS - Database Management System

24. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
Comparison Operators
MIN()
Always define Primary Keys
Row

25. A popular open source database
DISTINCT
DESC
mysql
application

26. Allows you to delete selected rows.
FROM
DELETE
Self-Join
mysql

27. Used to nest subqueries within another subquery.
WHERE
Nested Subquery
SELECT
Simple Subquery

28. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
WHERE
Breaking up data
Keyword
SELECT

29. SQL is a language NOT an _______
SELECT Statement
application
UPDATE
FROM

30. Lets you change the values in one or more selected rows of a table.
FROM
varchar(size)
UPDATE
SUM()

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

32. Allows a comparison with multiple values from a list.
ANY
number(size -d)
IN
COUNT()

33. The container - usually a file or set of files - to store organized data
Database
Primary Key
IN
Aggregate Functions

34. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
Comparison Operators
Terminating Statements
Self-Join
DBMS - Database Management System

35. A record in a table
DBMS - Database Management System
IN
Row
number(size -d)

36. Limits the output of the established groups into the derived result group.
HAVING
Terminating Statements
WHERE
number(size -d)

37. NOT - AND - OR
Logical Operators
char(size)
mysql
MIN()

38. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
DESC
Keyword
AS

39. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
DISTINCT
UPDATE
varchar(size)
Self-Join

40. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
LIKE
GROUP BY
number(size -d)
varchar(size)

41. Method used to copy multiple records at one time using a SELECT statement
SELECT Statement
DELETE
SELECT *
INSERT INTO

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

43. _______ column name FROM table name
SUM()
SELECT
Row
ASC

44. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
Comparison Operators
Aggregate Functions
Logical Operators
LIKE

45. Specify one or more columns on which to order the display.
ORDER BY
HAVING
DISTINCT
GROUP BY

46. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
Aggregate Functions
application
AS
MAX()

47. Multiple SQL statements must be separated by semicolons.
mysql
UPDATE
Commas
Terminating Statements

48. Limits the rows that appear in the result to those matching a specified condition
ASC
WHERE
Use of Whitespace
DISTINCT

49. Database software (an application)
SUM()
SQL (Structured Query Language)
DISTINCT
DBMS - Database Management System

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