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. Database software (an application)
DBMS - Database Management System
char(size)
Nested Subquery
SUM()

2. Specifies the tables or views from which rows and columns are retrieved
IN
LIKE
Row
FROM

3. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
INSERT INTO
COUNT()
SUM()
Column

4. COUNT() - MAX() - MIN() - SUM() and AVG()
AVG()
Aggregate Functions
SQL extensions
INSERT INTO

5. 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.
Commas
mysql
Always define Primary Keys
Nested Subquery

6. SQL is a language NOT an _______
varchar(size)
application
Terminating Statements
SELECT

7. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
SELECT *
AS
char(size)
LIKE

8. A language designed specifically for communicating with databases.
DISTINCT
MAX()
DBMS - Database Management System
SQL (Structured Query Language)

9. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
application
GROUP BY
Logical Operators
WHERE

10. Descending
DESC
AVG()
Always define Primary Keys
Simple Subquery

11. Ascending
Breaking up data
INSERT INTO
ASC
Column

12. Limits the output of the established groups into the derived result group.
Table
Breaking up data
HAVING
SELECT *

13. Limits the rows that appear in the result to those matching a specified condition
FROM
mysql
WHERE
SQL extensions

14. Method used to copy multiple records at one time using a SELECT statement
INSERT INTO
COUNT()
Keyword
ASC

15. A structured list of data of a specific type
AVG()
Terminating Statements
application
Table

16. The container - usually a file or set of files - to store organized data
Breaking up data
Nested Subquery
Use of Whitespace
Database

17. Used to nest subqueries within another subquery.
Comparison Operators
Database
Column
Nested Subquery

18. Allows you to delete selected rows.
ANY
Nested Subquery
DELETE
HAVING

19. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
Row
LIKE
MAX()
DBMS - Database Management System

20. A single field in a table. All tables are made up of one or more columns.
HAVING
number(size -d)
Column
LIKE

21. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
Database
Aggregate Functions
AS
Keyword

22. Specify one or more columns on which to order the display.
WHERE
Always define Primary Keys
Breaking up data
ORDER BY

23. NOT - AND - OR
GROUP BY
number(size -d)
COUNT()
Logical Operators

24. SQL statements are case- insensitive
AS
SQL Statement and Case
Terminating Statements
SQL extensions

25. Variable-length character string. Max size is specified in parenthesis.
char(size)
MIN()
Primary Key
varchar(size)

26. Denotes that the search condition is TRUE for at least one element that the subquery returns.
ANY
mysql
application
SELECT *

27. Primary way to do a query in SQL
Simple Subquery
Always define Primary Keys
Use of Whitespace
SELECT Statement

28. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Self-Join
AVG()
Datatype
char(size)

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.
WHERE
application
Always define Primary Keys
number(size -d)

30. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
SUM()
ANY
Comparison Operators
Breaking up data

31. Used to select all the information in a specified column.
Nested Subquery
ASC
mysql
SELECT *

32. A column or set of columns whose values uniquely identify every row in a table.
Primary Key
GROUP BY
DBMS - Database Management System
HAVING

33. 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()
SELECT
DESC
AS

34. A record in a table
Primary Key
SELECT Statement
ASC
Row

35. Alias
SQL extensions
Commas
AS
SELECT Statement

36. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
FROM
DISTINCT
Breaking up data
char(size)

37. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
MIN()
Simple Subquery
SQL Statement and Case
LIKE

38. Multiple SQL statements must be separated by semicolons.
Simple Subquery
ORDER BY
Terminating Statements
SELECT Statement

39. A popular open source database
MAX()
mysql
Database
Breaking up data

40. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Commas
COUNT()
SQL extensions
varchar(size)

41. Simplest type of subquery.
Simple Subquery
Self-Join
MIN()
SQL extensions

42. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
DISTINCT
Self-Join
SELECT *
Datatype

43. Provides a numerical tally of how many rows meet a specific set of criteria.
COUNT()
DBMS - Database Management System
Terminating Statements
varchar(size)

44. Lets you change the values in one or more selected rows of a table.
SELECT Statement
Always define Primary Keys
mysql
UPDATE

45. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
FROM
varchar(size)
LIKE
SELECT *

46. Allows a comparison with multiple values from a list.
Primary Key
SQL Statement and Case
ORDER BY
IN

47. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
Breaking up data
Simple Subquery
SQL Statement and Case
MIN()

48. _______ column name FROM table name
Nested Subquery
MIN()
ORDER BY
SELECT

49. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
Column
Terminating Statements
Use of Whitespace
SQL extensions

50. All extra whitespace within a SQL statement is is ignored when that statement is processed.
FROM
application
Use of Whitespace
WHERE