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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. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
HAVING
GROUP BY
DISTINCT
Self-Join

2. Limits the output of the established groups into the derived result group.
Column
Breaking up data
MIN()
HAVING

3. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Primary Key
varchar(size)
Always define Primary Keys
Use of Whitespace

4. 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.
Commas
AVG()
SUM()
COUNT()

5. A structured list of data of a specific type
Self-Join
ORDER BY
FROM
Table

6. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
SQL extensions
Keyword
Simple Subquery
SELECT Statement

7. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
DELETE
SELECT *
Use of Whitespace
char(size)

8. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
DESC
LIKE
MIN()
SELECT Statement

9. COUNT() - MAX() - MIN() - SUM() and AVG()
Aggregate Functions
mysql
MAX()
number(size -d)

10. Multiple SQL statements must be separated by semicolons.
SELECT *
ASC
Database
Terminating Statements

11. Used to select all the information in a specified column.
Aggregate Functions
SELECT *
Column
SELECT Statement

12. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
Terminating Statements
DESC
SELECT *

13. Specifies the tables or views from which rows and columns are retrieved
FROM
HAVING
AS
DBMS - Database Management System

14. Allows you to delete selected rows.
Comparison Operators
Row
Datatype
DELETE

15. Limits the rows that appear in the result to those matching a specified condition
WHERE
HAVING
FROM
varchar(size)

16. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
COUNT()
GROUP BY
DISTINCT
Self-Join

17. Denotes that the search condition is TRUE for at least one element that the subquery returns.
Breaking up data
DBMS - Database Management System
ANY
DELETE

18. Alias
Commas
AS
ORDER BY
Terminating Statements

19. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
SUM()
Breaking up data
WHERE
AVG()

20. Simplest type of subquery.
Simple Subquery
SELECT *
ANY
LIKE

21. A language designed specifically for communicating with databases.
MAX()
Logical Operators
SQL (Structured Query Language)
ORDER BY

22. A column or set of columns whose values uniquely identify every row in a table.
UPDATE
FROM
Primary Key
Comparison Operators

23. Ascending
Nested Subquery
DBMS - Database Management System
varchar(size)
ASC

24. Descending
DESC
FROM
AVG()
SQL (Structured Query Language)

25. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
SUM()
Comparison Operators
ORDER BY
Nested Subquery

26. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
SUM()
DESC
mysql
Datatype

27. Provides a numerical tally of how many rows meet a specific set of criteria.
Datatype
Nested Subquery
COUNT()
AVG()

28. A popular open source database
Commas
mysql
AVG()
Primary Key

29. _______ column name FROM table name
AVG()
Comparison Operators
IN
SELECT

30. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
Simple Subquery
GROUP BY
MAX()
SELECT Statement

31. SQL statements are case- insensitive
DESC
application
SQL Statement and Case
Aggregate Functions

32. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Breaking up data
SQL (Structured Query Language)
Primary Key
Aggregate Functions

33. Specify one or more columns on which to order the display.
ORDER BY
Breaking up data
SELECT *
MIN()

34. Database software (an application)
DBMS - Database Management System
Column
Datatype
mysql

35. Allows a comparison with multiple values from a list.
GROUP BY
IN
Table
WHERE

36. 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.
AS
Row
Always define Primary Keys
MAX()

37. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
LIKE
char(size)
SQL extensions
mysql

38. Primary way to do a query in SQL
GROUP BY
SELECT Statement
AVG()
DISTINCT

39. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
Simple Subquery
Primary Key
DESC
number(size -d)

40. Lets you change the values in one or more selected rows of a table.
Aggregate Functions
UPDATE
Breaking up data
SQL (Structured Query Language)

41. A record in a table
IN
Row
HAVING
Commas

42. A single field in a table. All tables are made up of one or more columns.
DISTINCT
MAX()
Database
Column

43. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
WHERE
DELETE
Keyword
MAX()

44. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
ORDER BY
number(size -d)
Commas
HAVING

45. Used to nest subqueries within another subquery.
Simple Subquery
char(size)
Keyword
Nested Subquery

46. SQL is a language NOT an _______
application
DISTINCT
AS
number(size -d)

47. NOT - AND - OR
ASC
Nested Subquery
Logical Operators
SELECT *

48. Method used to copy multiple records at one time using a SELECT statement
SQL (Structured Query Language)
INSERT INTO
ANY
varchar(size)

49. The container - usually a file or set of files - to store organized data
Nested Subquery
varchar(size)
Database
SQL extensions

50. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
DISTINCT
SUM()
Nested Subquery
Keyword