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. Simplest type of subquery.
Simple Subquery
MAX()
number(size -d)
DBMS - Database Management System

2. Allows you to delete selected rows.
DISTINCT
DELETE
Aggregate Functions
mysql

3. NOT - AND - OR
Logical Operators
AS
Keyword
SQL Statement and Case

4. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Always define Primary Keys
mysql
Use of Whitespace
char(size)

5. A structured list of data of a specific type
Nested Subquery
Table
application
Breaking up data

6. Method used to copy multiple records at one time using a SELECT statement
SELECT *
DESC
INSERT INTO
HAVING

7. Ascending
UPDATE
LIKE
ASC
DBMS - Database Management System

8. Multiple SQL statements must be separated by semicolons.
Terminating Statements
ORDER BY
mysql
Table

9. Limits the output of the established groups into the derived result group.
DELETE
INSERT INTO
HAVING
SQL Statement and Case

10. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
INSERT INTO
AVG()
Breaking up data
mysql

11. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Commas
Always define Primary Keys
Comparison Operators
SELECT *

12. A column or set of columns whose values uniquely identify every row in a table.
Use of Whitespace
SELECT Statement
Primary Key
HAVING

13. Used to select all the information in a specified column.
UPDATE
Keyword
SELECT *
LIKE

14. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
Keyword
Self-Join
number(size -d)
Table

15. A popular open source database
mysql
SELECT *
Row
Commas

16. A language designed specifically for communicating with databases.
SQL (Structured Query Language)
Keyword
COUNT()
mysql

17. Used to nest subqueries within another subquery.
MAX()
Nested Subquery
AS
mysql

18. Descending
DESC
Primary Key
Simple Subquery
DELETE

19. Variable-length character string. Max size is specified in parenthesis.
FROM
DESC
varchar(size)
AVG()

20. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
WHERE
Table
Comparison Operators
Row

21. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
SQL extensions
Database
FROM
DISTINCT

22. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
SQL Statement and Case
MAX()
mysql
FROM

23. Alias
AS
Primary Key
UPDATE
SUM()

24. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
DBMS - Database Management System
AVG()
HAVING
char(size)

25. Database software (an application)
DBMS - Database Management System
SQL Statement and Case
Column
ORDER BY

26. The container - usually a file or set of files - to store organized data
COUNT()
IN
Comparison Operators
Database

27. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
Breaking up data
Aggregate Functions
MIN()
Terminating Statements

28. A single field in a table. All tables are made up of one or more columns.
SUM()
MAX()
Datatype
Column

29. SQL statements are case- insensitive
Self-Join
SQL Statement and Case
DBMS - Database Management System
SELECT Statement

30. Limits the rows that appear in the result to those matching a specified condition
INSERT INTO
WHERE
Terminating Statements
MIN()

31. Denotes that the search condition is TRUE for at least one element that the subquery returns.
Always define Primary Keys
Self-Join
MAX()
ANY

32. 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.
Keyword
Primary Key
SELECT
AVG()

33. Specify one or more columns on which to order the display.
SQL Statement and Case
ORDER BY
Comparison Operators
UPDATE

34. COUNT() - MAX() - MIN() - SUM() and AVG()
Commas
Breaking up data
DESC
Aggregate Functions

35. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
Self-Join
SUM()
Column
Breaking up data

36. SQL is a language NOT an _______
INSERT INTO
char(size)
application
Comparison Operators

37. A record in a table
Always define Primary Keys
Row
Comparison Operators
DESC

38. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
SQL extensions
Column
GROUP BY
ANY

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.
SELECT *
number(size -d)
MAX()
Aggregate Functions

40. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
ORDER BY
LIKE
SELECT *
Datatype

41. Lets you change the values in one or more selected rows of a table.
Always define Primary Keys
UPDATE
SELECT Statement
Breaking up data

42. Primary way to do a query in SQL
SELECT
SELECT Statement
ASC
application

43. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Datatype
Table
FROM
DISTINCT

44. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
AVG()
Keyword
INSERT INTO
Self-Join

45. Allows a comparison with multiple values from a list.
IN
Comparison Operators
SELECT
Nested Subquery

46. 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.
ORDER BY
Always define Primary Keys
SQL (Structured Query Language)
MIN()

47. Specifies the tables or views from which rows and columns are retrieved
SELECT
Commas
FROM
AS

48. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
INSERT INTO
GROUP BY
Aggregate Functions
Column

49. _______ column name FROM table name
SQL extensions
SELECT
DBMS - Database Management System
Datatype

50. Provides a numerical tally of how many rows meet a specific set of criteria.
number(size -d)
Row
COUNT()
Use of Whitespace