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. Method used to copy multiple records at one time using a SELECT statement
ANY
Terminating Statements
INSERT INTO
SQL extensions

2. SQL statements are case- insensitive
AVG()
SUM()
SQL Statement and Case
SQL (Structured Query Language)

3. Used to select all the information in a specified column.
SELECT *
Column
LIKE
AS

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.
Always define Primary Keys
AVG()
WHERE
SELECT Statement

5. A single field in a table. All tables are made up of one or more columns.
application
Logical Operators
Column
Always define Primary Keys

6. Lets you change the values in one or more selected rows of a table.
AVG()
SELECT Statement
UPDATE
AS

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

8. _______ column name FROM table name
Row
FROM
Nested Subquery
SELECT

9. Limits the output of the established groups into the derived result group.
HAVING
ORDER BY
ASC
number(size -d)

10. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
char(size)
number(size -d)
application
varchar(size)

11. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
INSERT INTO
SQL extensions
Commas
Always define Primary Keys

12. The container - usually a file or set of files - to store organized data
Self-Join
Row
COUNT()
Database

13. Provides a numerical tally of how many rows meet a specific set of criteria.
DISTINCT
SQL extensions
FROM
COUNT()

14. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
FROM
Self-Join
MIN()
ORDER BY

15. Ascending
ASC
FROM
COUNT()
Self-Join

16. Used to nest subqueries within another subquery.
SUM()
Nested Subquery
Primary Key
Use of Whitespace

17. A language designed specifically for communicating with databases.
AS
MIN()
SQL (Structured Query Language)
mysql

18. A popular open source database
SELECT Statement
mysql
Terminating Statements
DELETE

19. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
SELECT Statement
Breaking up data
HAVING
ASC

20. A structured list of data of a specific type
Table
ORDER BY
Use of Whitespace
Comparison Operators

21. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
AVG()
SELECT *
Keyword
SELECT

22. Allows a comparison with multiple values from a list.
char(size)
Use of Whitespace
ASC
IN

23. A column or set of columns whose values uniquely identify every row in a table.
SELECT Statement
Primary Key
Datatype
Nested Subquery

24. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
Use of Whitespace
Logical Operators
AVG()
MIN()

25. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
WHERE
Logical Operators
UPDATE
LIKE

26. Multiple SQL statements must be separated by semicolons.
WHERE
Primary Key
number(size -d)
Terminating Statements

27. Specifies the tables or views from which rows and columns are retrieved
IN
COUNT()
FROM
ASC

28. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
HAVING
LIKE
Comparison Operators
char(size)

29. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
Keyword
Simple Subquery
DISTINCT

30. Descending
DESC
Use of Whitespace
FROM
Simple Subquery

31. 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.
Terminating Statements
char(size)
Always define Primary Keys
INSERT INTO

32. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Datatype
Simple Subquery
Commas
DBMS - Database Management System

33. Database software (an application)
DBMS - Database Management System
mysql
MAX()
Self-Join

34. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
COUNT()
Logical Operators
SQL extensions
ANY

35. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
HAVING
Comparison Operators
MAX()
INSERT INTO

36. Specify one or more columns on which to order the display.
Breaking up data
AVG()
number(size -d)
ORDER BY

37. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Keyword
Use of Whitespace
Aggregate Functions
Comparison Operators

38. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
Use of Whitespace
SUM()
ANY
Comparison Operators

39. SQL is a language NOT an _______
Comparison Operators
application
Commas
Row

40. Allows you to delete selected rows.
Simple Subquery
Always define Primary Keys
DELETE
GROUP BY

41. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
Always define Primary Keys
SQL Statement and Case
DISTINCT
SELECT

42. Simplest type of subquery.
Primary Key
Simple Subquery
Nested Subquery
UPDATE

43. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
COUNT()
Nested Subquery
MAX()
HAVING

44. A record in a table
DISTINCT
SELECT Statement
INSERT INTO
Row

45. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
SQL extensions
Always define Primary Keys
ASC
GROUP BY

46. Denotes that the search condition is TRUE for at least one element that the subquery returns.
application
ANY
MAX()
Aggregate Functions

47. Alias
AS
ORDER BY
INSERT INTO
Primary Key

48. NOT - AND - OR
mysql
AVG()
FROM
Logical Operators

49. COUNT() - MAX() - MIN() - SUM() and AVG()
Aggregate Functions
SQL extensions
Comparison Operators
number(size -d)

50. Limits the rows that appear in the result to those matching a specified condition
HAVING
SQL (Structured Query Language)
WHERE
DESC