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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. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
DISTINCT
Table
Keyword
SELECT

2. Multiple SQL statements must be separated by semicolons.
Terminating Statements
Nested Subquery
WHERE
varchar(size)

3. A popular open source database
mysql
Breaking up data
SUM()
ASC

4. A record in a table
Row
mysql
SQL (Structured Query Language)
WHERE

5. 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.
Nested Subquery
Primary Key
Always define Primary Keys
Column

6. Used to select all the information in a specified column.
SELECT *
Database
SQL (Structured Query Language)
ASC

7. Ascending
number(size -d)
Database
Nested Subquery
ASC

8. A structured list of data of a specific type
SQL Statement and Case
application
Datatype
Table

9. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Use of Whitespace
SELECT Statement
UPDATE
Primary Key

10. Allows a comparison with multiple values from a list.
IN
Always define Primary Keys
ORDER BY
SELECT *

11. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
DISTINCT
Table
char(size)
WHERE

12. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
SQL (Structured Query Language)
SUM()
ORDER BY
varchar(size)

13. Simplest type of subquery.
DISTINCT
Simple Subquery
Use of Whitespace
MAX()

14. Specifies the tables or views from which rows and columns are retrieved
SQL (Structured Query Language)
FROM
Table
DESC

15. The container - usually a file or set of files - to store organized data
Database
MAX()
Breaking up data
DISTINCT

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

17. _______ column name FROM table name
ASC
SELECT
DESC
SQL (Structured Query Language)

18. Specify one or more columns on which to order the display.
SELECT Statement
ORDER BY
Datatype
char(size)

19. A column or set of columns whose values uniquely identify every row in a table.
Table
DESC
Primary Key
mysql

20. COUNT() - MAX() - MIN() - SUM() and AVG()
Aggregate Functions
DBMS - Database Management System
COUNT()
Commas

21. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
MIN()
SELECT *
ASC
Always define Primary Keys

22. Variable-length character string. Max size is specified in parenthesis.
SQL (Structured Query Language)
Terminating Statements
varchar(size)
MAX()

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

24. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
Keyword
Datatype
Breaking up data
INSERT INTO

25. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
Comparison Operators
ORDER BY
COUNT()
Breaking up data

26. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
Terminating Statements
varchar(size)
GROUP BY
SELECT

27. Denotes that the search condition is TRUE for at least one element that the subquery returns.
Column
ANY
Table
Always define Primary Keys

28. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
MAX()
application
SQL extensions
IN

29. SQL is a language NOT an _______
char(size)
DISTINCT
Breaking up data
application

30. SQL statements are case- insensitive
IN
SQL Statement and Case
mysql
DBMS - Database Management System

31. Allows you to delete selected rows.
Comparison Operators
DELETE
WHERE
DBMS - Database Management System

32. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
ANY
SQL extensions
Breaking up data
SQL (Structured Query Language)

33. Descending
ASC
Commas
DELETE
DESC

34. Provides a numerical tally of how many rows meet a specific set of criteria.
WHERE
COUNT()
AVG()
SQL extensions

35. Alias
AS
varchar(size)
HAVING
DELETE

36. NOT - AND - OR
DISTINCT
application
Logical Operators
ANY

37. Lets you change the values in one or more selected rows of a table.
HAVING
UPDATE
Use of Whitespace
Commas

38. A single field in a table. All tables are made up of one or more columns.
Aggregate Functions
Keyword
Column
Always define Primary Keys

39. A language designed specifically for communicating with databases.
SQL (Structured Query Language)
application
Use of Whitespace
Row

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

41. Primary way to do a query in SQL
application
SELECT Statement
Datatype
Comparison Operators

42. Used to nest subqueries within another subquery.
Nested Subquery
WHERE
Always define Primary Keys
DELETE

43. Limits the output of the established groups into the derived result group.
HAVING
DISTINCT
Always define Primary Keys
DELETE

44. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
SUM()
number(size -d)
ASC
LIKE

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

46. Limits the rows that appear in the result to those matching a specified condition
application
Comparison Operators
WHERE
Keyword

47. Method used to copy multiple records at one time using a SELECT statement
ANY
INSERT INTO
SUM()
mysql

48. 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.
DELETE
char(size)
FROM
AVG()

49. Database software (an application)
Always define Primary Keys
DBMS - Database Management System
mysql
SELECT Statement

50. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
number(size -d)
Table
ANY
SQL Statement and Case