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. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
ASC
Terminating Statements
Breaking up data
DELETE

2. A language designed specifically for communicating with databases.
SELECT Statement
AVG()
SQL (Structured Query Language)
Column

3. SQL is a language NOT an _______
HAVING
IN
SQL Statement and Case
application

4. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
number(size -d)
Self-Join
DELETE
Datatype

5. Multiple SQL statements must be separated by semicolons.
Terminating Statements
ANY
varchar(size)
Commas

6. Alias
Row
FROM
AS
GROUP BY

7. Limits the output of the established groups into the derived result group.
Terminating Statements
SQL Statement and Case
DBMS - Database Management System
HAVING

8. Method used to copy multiple records at one time using a SELECT statement
SELECT *
DISTINCT
GROUP BY
INSERT INTO

9. Simplest type of subquery.
DELETE
DISTINCT
Simple Subquery
Comparison Operators

10. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
LIKE
Aggregate Functions
Comparison Operators
GROUP BY

11. Descending
DESC
UPDATE
AS
Commas

12. SQL statements are case- insensitive
SQL extensions
Simple Subquery
SQL (Structured Query Language)
SQL Statement and Case

13. A single field in a table. All tables are made up of one or more columns.
Terminating Statements
Breaking up data
LIKE
Column

14. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
char(size)
Terminating Statements
SQL (Structured Query Language)
Database

15. Variable-length character string. Max size is specified in parenthesis.
Logical Operators
varchar(size)
Always define Primary Keys
Row

16. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
MAX()
HAVING
LIKE
IN

17. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
IN
Datatype
Breaking up data
MAX()

18. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
char(size)
application
SQL extensions
varchar(size)

19. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
Nested Subquery
SELECT Statement
Keyword
COUNT()

20. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
mysql
Logical Operators
MIN()
GROUP BY

21. Specifies the tables or views from which rows and columns are retrieved
SELECT *
application
FROM
SELECT

22. 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.
LIKE
SELECT Statement
Database
AVG()

23. Provides a numerical tally of how many rows meet a specific set of criteria.
DISTINCT
COUNT()
DELETE
MAX()

24. A popular open source database
char(size)
mysql
UPDATE
SQL extensions

25. Allows a comparison with multiple values from a list.
application
AS
SELECT *
IN

26. A structured list of data of a specific type
Row
DISTINCT
Breaking up data
Table

27. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
Self-Join
GROUP BY
INSERT INTO
DESC

28. 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
DISTINCT
SQL Statement and Case
SUM()

29. Limits the rows that appear in the result to those matching a specified condition
WHERE
Comparison Operators
SQL extensions
char(size)

30. Used to nest subqueries within another subquery.
WHERE
Simple Subquery
Nested Subquery
DISTINCT

31. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Commas
SELECT Statement
HAVING
AVG()

32. Lets you change the values in one or more selected rows of a table.
Database
Comparison Operators
UPDATE
Keyword

33. COUNT() - MAX() - MIN() - SUM() and AVG()
SELECT Statement
Commas
Aggregate Functions
MAX()

34. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
number(size -d)
COUNT()
Terminating Statements
UPDATE

35. Ascending
ASC
SUM()
FROM
ANY

36. Allows you to delete selected rows.
SELECT *
DELETE
ORDER BY
Column

37. Database software (an application)
FROM
DBMS - Database Management System
COUNT()
DELETE

38. The container - usually a file or set of files - to store organized data
application
ANY
Database
FROM

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.
SQL Statement and Case
Comparison Operators
Always define Primary Keys
number(size -d)

40. Denotes that the search condition is TRUE for at least one element that the subquery returns.
AS
HAVING
FROM
ANY

41. _______ column name FROM table name
Datatype
Breaking up data
Column
SELECT

42. NOT - AND - OR
SELECT
Logical Operators
Datatype
WHERE

43. Specify one or more columns on which to order the display.
SQL Statement and Case
Always define Primary Keys
ORDER BY
Simple Subquery

44. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Use of Whitespace
varchar(size)
MIN()
Logical Operators

45. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
Aggregate Functions
ASC
SUM()
SQL (Structured Query Language)

46. Used to select all the information in a specified column.
SQL Statement and Case
Aggregate Functions
SELECT *
SELECT Statement

47. A column or set of columns whose values uniquely identify every row in a table.
ORDER BY
Primary Key
Self-Join
varchar(size)

48. A record in a table
AS
Row
Self-Join
char(size)

49. Primary way to do a query in SQL
Column
SELECT Statement
Commas
mysql

50. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
Datatype
WHERE
UPDATE
COUNT()