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. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
MAX()
ORDER BY
UPDATE
Logical Operators

2. Used to nest subqueries within another subquery.
mysql
Database
Nested Subquery
application

3. Multiple SQL statements must be separated by semicolons.
SQL Statement and Case
Terminating Statements
INSERT INTO
MAX()

4. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Breaking up data
DESC
Datatype
AS

5. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
varchar(size)
MIN()
Always define Primary Keys
Commas

6. Method used to copy multiple records at one time using a SELECT statement
SQL Statement and Case
INSERT INTO
Always define Primary Keys
SELECT *

7. Denotes that the search condition is TRUE for at least one element that the subquery returns.
ASC
Primary Key
MIN()
ANY

8. A structured list of data of a specific type
DISTINCT
Table
UPDATE
Logical Operators

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

10. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
Datatype
SQL Statement and Case
Self-Join
HAVING

11. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Breaking up data
Keyword
SELECT *
AS

12. Used to select all the information in a specified column.
Simple Subquery
WHERE
SELECT *
SQL extensions

13. Descending
DESC
UPDATE
Always define Primary Keys
SELECT *

14. A column or set of columns whose values uniquely identify every row in a table.
mysql
Self-Join
Simple Subquery
Primary Key

15. Alias
Keyword
SQL extensions
AS
Comparison Operators

16. Allows a comparison with multiple values from a list.
mysql
application
IN
WHERE

17. Primary way to do a query in SQL
FROM
Terminating Statements
SELECT Statement
Column

18. COUNT() - MAX() - MIN() - SUM() and AVG()
Keyword
DISTINCT
SQL extensions
Aggregate Functions

19. Specify one or more columns on which to order the display.
COUNT()
SELECT Statement
DESC
ORDER BY

20. The container - usually a file or set of files - to store organized data
AVG()
DISTINCT
SQL (Structured Query Language)
Database

21. A language designed specifically for communicating with databases.
SQL Statement and Case
DISTINCT
SQL (Structured Query Language)
HAVING

22. SQL statements are case- insensitive
Column
DBMS - Database Management System
AS
SQL Statement and Case

23. Provides a numerical tally of how many rows meet a specific set of criteria.
Column
DISTINCT
COUNT()
Nested Subquery

24. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
Primary Key
Simple Subquery
DISTINCT
ASC

25. 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.
SUM()
AVG()
SELECT
mysql

26. Allows you to delete selected rows.
Table
AS
DELETE
Primary Key

27. NOT - AND - OR
Logical Operators
GROUP BY
SQL extensions
DESC

28. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Always define Primary Keys
number(size -d)
Use of Whitespace
ANY

29. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
Aggregate Functions
number(size -d)
GROUP BY
char(size)

30. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Breaking up data
MAX()
Commas
DESC

31. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
LIKE
Database
COUNT()
FROM

32. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
INSERT INTO
SUM()
UPDATE
char(size)

33. A popular open source database
ASC
SQL Statement and Case
Always define Primary Keys
mysql

34. Lets you change the values in one or more selected rows of a table.
UPDATE
SELECT *
DESC
AVG()

35. A record in a table
FROM
HAVING
Table
Row

36. Database software (an application)
Database
Column
Commas
DBMS - Database Management System

37. A single field in a table. All tables are made up of one or more columns.
Column
Self-Join
Simple Subquery
DESC

38. Limits the output of the established groups into the derived result group.
SUM()
Aggregate Functions
SELECT
HAVING

39. 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.
WHERE
Always define Primary Keys
application
Keyword

40. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
SELECT Statement
SUM()
DBMS - Database Management System
Table

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

42. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
MIN()
Primary Key
SQL extensions
DELETE

43. SQL is a language NOT an _______
Comparison Operators
ORDER BY
application
MAX()

44. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
Keyword
application
IN
LIKE

45. Specifies the tables or views from which rows and columns are retrieved
UPDATE
Self-Join
FROM
Always define Primary Keys

46. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
Breaking up data
Database
Simple Subquery
GROUP BY

47. Ascending
ASC
DISTINCT
Breaking up data
ORDER BY

48. _______ column name FROM table name
application
Always define Primary Keys
SELECT
MIN()

49. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
DESC
DISTINCT
ASC

50. Simplest type of subquery.
SELECT *
Commas
AS
Simple Subquery