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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. A column or set of columns whose values uniquely identify every row in a table.
Row
number(size -d)
Primary Key
ORDER BY

2. Denotes that the search condition is TRUE for at least one element that the subquery returns.
ANY
Self-Join
MAX()
HAVING

3. All extra whitespace within a SQL statement is is ignored when that statement is processed.
SELECT
ANY
MIN()
Use of Whitespace

4. Ascending
MIN()
HAVING
LIKE
ASC

5. Variable-length character string. Max size is specified in parenthesis.
IN
SQL (Structured Query Language)
varchar(size)
mysql

6. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
number(size -d)
Self-Join
MIN()
COUNT()

7. SQL statements are case- insensitive
HAVING
SQL Statement and Case
ORDER BY
Comparison Operators

8. Lets you change the values in one or more selected rows of a table.
LIKE
Nested Subquery
UPDATE
Commas

9. The container - usually a file or set of files - to store organized data
Database
Commas
AS
Table

10. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
SQL extensions
Datatype
AVG()
ANY

11. NOT - AND - OR
Logical Operators
DBMS - Database Management System
Row
SQL Statement and Case

12. Simplest type of subquery.
UPDATE
Use of Whitespace
SUM()
Simple Subquery

13. Database software (an application)
SQL extensions
Datatype
DBMS - Database Management System
MIN()

14. Descending
Keyword
Aggregate Functions
INSERT INTO
DESC

15. Allows a comparison with multiple values from a list.
UPDATE
Use of Whitespace
IN
ORDER BY

16. A language designed specifically for communicating with databases.
varchar(size)
SQL (Structured Query Language)
Breaking up data
char(size)

17. Specify one or more columns on which to order the display.
Comparison Operators
LIKE
ORDER BY
Database

18. Limits the output of the established groups into the derived result group.
IN
application
HAVING
SQL Statement and Case

19. A single field in a table. All tables are made up of one or more columns.
ASC
Column
Table
SELECT *

20. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
HAVING
SQL (Structured Query Language)
SUM()
Row

21. _______ column name FROM table name
DBMS - Database Management System
varchar(size)
Breaking up data
SELECT

22. Limits the rows that appear in the result to those matching a specified condition
Primary Key
DESC
MAX()
WHERE

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

24. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
ORDER BY
Self-Join
mysql
SELECT Statement

25. COUNT() - MAX() - MIN() - SUM() and AVG()
SUM()
Aggregate Functions
COUNT()
mysql

26. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
char(size)
Breaking up data
Always define Primary Keys
mysql

27. Provides a numerical tally of how many rows meet a specific set of criteria.
SQL (Structured Query Language)
ORDER BY
ANY
COUNT()

28. Primary way to do a query in SQL
Breaking up data
SUM()
DISTINCT
SELECT Statement

29. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
SQL extensions
COUNT()
INSERT INTO
Comparison Operators

30. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
GROUP BY
Column
Simple Subquery
LIKE

31. Alias
ASC
AS
Row
DESC

32. A popular open source database
mysql
Aggregate Functions
ASC
DISTINCT

33. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
mysql
Row
DISTINCT
SQL (Structured Query Language)

34. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Simple Subquery
Primary Key
Database
Commas

35. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
MAX()
ANY
number(size -d)
WHERE

36. A record in a table
Row
SELECT
Aggregate Functions
Database

37. SQL is a language NOT an _______
Database
IN
AVG()
application

38. 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.
SQL (Structured Query Language)
Always define Primary Keys
DISTINCT
ASC

39. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
SELECT Statement
Keyword
Row
ORDER BY

40. 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.
Self-Join
Keyword
Logical Operators
AVG()

41. Specifies the tables or views from which rows and columns are retrieved
Always define Primary Keys
Simple Subquery
FROM
WHERE

42. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
MAX()
varchar(size)
SQL extensions
SQL Statement and Case

43. Used to select all the information in a specified column.
ORDER BY
SELECT *
ANY
SELECT

44. Allows you to delete selected rows.
char(size)
Column
Self-Join
DELETE

45. A structured list of data of a specific type
Table
Terminating Statements
Always define Primary Keys
Breaking up data

46. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
SELECT Statement
char(size)
varchar(size)
Keyword

47. Method used to copy multiple records at one time using a SELECT statement
Self-Join
number(size -d)
DESC
INSERT INTO

48. Multiple SQL statements must be separated by semicolons.
WHERE
Terminating Statements
SUM()
Breaking up data

49. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
Database
Row
number(size -d)
Nested Subquery

50. Used to nest subqueries within another subquery.
char(size)
MIN()
Nested Subquery
SQL Statement and Case