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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. A column or set of columns whose values uniquely identify every row in a table.
SQL Statement and Case
Primary Key
INSERT INTO
ANY

2. Limits the rows that appear in the result to those matching a specified condition
IN
SUM()
varchar(size)
WHERE

3. COUNT() - MAX() - MIN() - SUM() and AVG()
Nested Subquery
Aggregate Functions
DISTINCT
SUM()

4. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
number(size -d)
WHERE
Logical Operators
SUM()

5. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
Self-Join
ORDER BY
Breaking up data
MIN()

6. Provides a numerical tally of how many rows meet a specific set of criteria.
mysql
varchar(size)
COUNT()
DELETE

7. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
SQL (Structured Query Language)
GROUP BY
Always define Primary Keys
varchar(size)

8. Limits the output of the established groups into the derived result group.
Breaking up data
SUM()
HAVING
SQL (Structured Query Language)

9. Multiple SQL statements must be separated by semicolons.
Terminating Statements
Database
Aggregate Functions
SQL (Structured Query Language)

10. Allows you to delete selected rows.
DELETE
SELECT *
Terminating Statements
Column

11. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
LIKE
SELECT *
SELECT Statement
DISTINCT

12. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
DESC
Use of Whitespace
ASC
Comparison Operators

13. A single field in a table. All tables are made up of one or more columns.
Row
WHERE
Column
SQL extensions

14. Used to nest subqueries within another subquery.
DISTINCT
Keyword
Nested Subquery
SQL (Structured Query Language)

15. SQL statements are case- insensitive
Column
SQL Statement and Case
Breaking up data
FROM

16. Simplest type of subquery.
Always define Primary Keys
Simple Subquery
Logical Operators
DELETE

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

18. A popular open source database
mysql
FROM
MIN()
SQL Statement and Case

19. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
DESC
DELETE
SQL extensions
Self-Join

20. Primary way to do a query in SQL
Simple Subquery
SQL extensions
WHERE
SELECT Statement

21. Method used to copy multiple records at one time using a SELECT statement
number(size -d)
Breaking up data
AVG()
INSERT INTO

22. Used to select all the information in a specified column.
ASC
Use of Whitespace
SQL Statement and Case
SELECT *

23. NOT - AND - OR
MIN()
varchar(size)
Table
Logical Operators

24. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
MAX()
SELECT *
Always define Primary Keys
Terminating Statements

25. 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.
Always define Primary Keys
DELETE
Simple Subquery
Breaking up data

26. Ascending
Keyword
Database
IN
ASC

27. Database software (an application)
SQL extensions
DBMS - Database Management System
application
Aggregate Functions

28. Lets you change the values in one or more selected rows of a table.
ASC
SELECT
UPDATE
SQL extensions

29. Specify one or more columns on which to order the display.
Breaking up data
SQL (Structured Query Language)
ORDER BY
INSERT INTO

30. Alias
ANY
number(size -d)
FROM
AS

31. Allows a comparison with multiple values from a list.
SUM()
Comparison Operators
LIKE
IN

32. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
Breaking up data
MAX()
SQL extensions
Commas

33. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Use of Whitespace
AVG()
FROM
SELECT *

34. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
application
IN
GROUP BY
Commas

35. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
FROM
Logical Operators
Datatype
number(size -d)

36. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
char(size)
Datatype
Comparison Operators
Terminating Statements

37. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
LIKE
Terminating Statements
Always define Primary Keys
DISTINCT

38. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
Keyword
Aggregate Functions
SQL Statement and Case
Always define Primary Keys

39. Descending
Commas
DESC
DBMS - Database Management System
SQL extensions

40. A record in a table
ORDER BY
SELECT Statement
Row
Table

41. Specifies the tables or views from which rows and columns are retrieved
mysql
WHERE
Self-Join
FROM

42. 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.
Logical Operators
Column
AVG()
Keyword

43. Variable-length character string. Max size is specified in parenthesis.
varchar(size)
Breaking up data
GROUP BY
HAVING

44. _______ column name FROM table name
SELECT
Primary Key
SELECT *
WHERE

45. A language designed specifically for communicating with databases.
SQL (Structured Query Language)
Commas
INSERT INTO
mysql

46. Denotes that the search condition is TRUE for at least one element that the subquery returns.
Table
SELECT Statement
mysql
ANY

47. SQL is a language NOT an _______
application
MAX()
MIN()
INSERT INTO

48. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
char(size)
ORDER BY
Keyword
MIN()

49. The container - usually a file or set of files - to store organized data
Database
SQL Statement and Case
char(size)
Simple Subquery

50. A structured list of data of a specific type
Simple Subquery
Table
MIN()
SQL Statement and Case