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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. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Commas
DESC
application
HAVING

2. Limits the rows that appear in the result to those matching a specified condition
WHERE
DELETE
LIKE
Table

3. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
varchar(size)
Simple Subquery
Comparison Operators
Primary Key

4. The container - usually a file or set of files - to store organized data
Database
WHERE
SELECT *
Datatype

5. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
Comparison Operators
Commas
MAX()
SQL extensions

6. Alias
DELETE
number(size -d)
AS
Terminating Statements

7. Ascending
SELECT Statement
Simple Subquery
SELECT *
ASC

8. Used to nest subqueries within another subquery.
Keyword
LIKE
SQL Statement and Case
Nested Subquery

9. A language designed specifically for communicating with databases.
Column
char(size)
SQL (Structured Query Language)
UPDATE

10. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
Keyword
GROUP BY
INSERT INTO
varchar(size)

11. Used to select all the information in a specified column.
DISTINCT
char(size)
Breaking up data
SELECT *

12. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
application
FROM
Use of Whitespace
Datatype

13. A record in a table
SQL extensions
Row
Always define Primary Keys
varchar(size)

14. 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()
Breaking up data
Logical Operators
Comparison Operators

15. _______ column name FROM table name
Table
ANY
Terminating Statements
SELECT

16. Primary way to do a query in SQL
MAX()
Datatype
Column
SELECT Statement

17. SQL is a language NOT an _______
GROUP BY
Table
ANY
application

18. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Use of Whitespace
ORDER BY
Commas
DESC

19. Database software (an application)
Commas
DBMS - Database Management System
COUNT()
SQL (Structured Query Language)

20. 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.
Always define Primary Keys
DESC
LIKE
Aggregate Functions

21. A column or set of columns whose values uniquely identify every row in a table.
char(size)
Primary Key
ASC
Keyword

22. Specifies the tables or views from which rows and columns are retrieved
SUM()
FROM
WHERE
DISTINCT

23. Simplest type of subquery.
SQL extensions
DISTINCT
Simple Subquery
DBMS - Database Management System

24. Allows a comparison with multiple values from a list.
IN
LIKE
AS
INSERT INTO

25. A single field in a table. All tables are made up of one or more columns.
Column
UPDATE
Comparison Operators
COUNT()

26. A structured list of data of a specific type
Aggregate Functions
UPDATE
Table
ASC

27. A popular open source database
FROM
mysql
AVG()
SELECT *

28. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
Use of Whitespace
ORDER BY
Aggregate Functions
number(size -d)

29. NOT - AND - OR
mysql
SELECT *
Logical Operators
Aggregate Functions

30. Lets you change the values in one or more selected rows of a table.
Terminating Statements
Keyword
COUNT()
UPDATE

31. Variable-length character string. Max size is specified in parenthesis.
Keyword
Datatype
varchar(size)
HAVING

32. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
Self-Join
ORDER BY
Nested Subquery
FROM

33. Provides a numerical tally of how many rows meet a specific set of criteria.
INSERT INTO
COUNT()
Aggregate Functions
mysql

34. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
WHERE
SQL extensions
AVG()
Keyword

35. Method used to copy multiple records at one time using a SELECT statement
INSERT INTO
Self-Join
COUNT()
SQL (Structured Query Language)

36. Descending
DBMS - Database Management System
DELETE
DESC
SELECT Statement

37. COUNT() - MAX() - MIN() - SUM() and AVG()
Aggregate Functions
Breaking up data
SUM()
INSERT INTO

38. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
Aggregate Functions
SQL extensions
SELECT *
AVG()

39. SQL statements are case- insensitive
Nested Subquery
SQL Statement and Case
GROUP BY
ASC

40. Denotes that the search condition is TRUE for at least one element that the subquery returns.
Keyword
Self-Join
SQL Statement and Case
ANY

41. Allows you to delete selected rows.
DELETE
ORDER BY
IN
Column

42. Specify one or more columns on which to order the display.
ORDER BY
SELECT *
UPDATE
Column

43. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
Datatype
AVG()
SUM()
FROM

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

45. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
FROM
DBMS - Database Management System
DISTINCT
IN

46. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
WHERE
SUM()
char(size)
MAX()

47. Multiple SQL statements must be separated by semicolons.
DBMS - Database Management System
Self-Join
SQL extensions
Terminating Statements

48. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Commas
Breaking up data
application
LIKE

49. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
HAVING
SELECT
SQL extensions
MIN()

50. Limits the output of the established groups into the derived result group.
SQL (Structured Query Language)
Commas
SUM()
HAVING