SQL: Structured Query Language

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. COUNT() - MAX() - MIN() - SUM() and AVG()
AS
Aggregate Functions
INSERT INTO
AVG()


2. 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.
Database
application
MIN()
Always define Primary Keys


3. Prevents duplicate values witihin a table or group of rows from being used in the evaluation of the function's result
SELECT
DISTINCT
Simple Subquery
AS


4. Lets you use a single- or multiple-character wildcards. Also - this command does not function in Microsoft Access.
Simple Subquery
Database
LIKE
varchar(size)


5. Limits the output of the established groups into the derived result group.
HAVING
DELETE
Comparison Operators
Row


6. Takes a single numeric or alphabetic cloumn and finds the HIGHEST constant value within it.
INSERT INTO
AS
Primary Key
MAX()


7. NOT - AND - OR
Logical Operators
Self-Join
Database
SELECT Statement


8. Allows a comparison with multiple values from a list.
IN
MAX()
Comparison Operators
COUNT()


9. Multiple SQL statements must be separated by semicolons.
Keyword
Terminating Statements
SQL (Structured Query Language)
Always define Primary Keys


10. SQL is a language NOT an _______
application
char(size)
Database
DELETE


11. SQL statements are case- insensitive
SQL Statement and Case
Column
Terminating Statements
ANY


12. A language designed specifically for communicating with databases.
DISTINCT
SQL (Structured Query Language)
Column
ANY


13. = Equals - < Less Than - > Greater Than - <= Less Than or Equal To - >= Greater Than or Equal To - <> Not Equal - ! Negation of
Comparison Operators
GROUP BY
Logical Operators
ORDER BY


14. A type of allowed data. Every table column has a datatype that restricts specific data in that column.
SQL (Structured Query Language)
IN
SQL extensions
Datatype


15. Allows you to correlate information between different rows of the same table and combine this information in rows of a result table.
Self-Join
COUNT()
SELECT Statement
SELECT *


16. Descending
DESC
Comparison Operators
FROM
INSERT INTO


17. 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.
AS
SQL Statement and Case
AVG()
Breaking up data


18. A structured list of data of a specific type
Row
Table
Keyword
SQL extensions


19. Method used to copy multiple records at one time using a SELECT statement
GROUP BY
MAX()
INSERT INTO
Terminating Statements


20. Usually DBMS specific - these can provide extra functionality or simplified ways to perform specific operations.
varchar(size)
SQL extensions
Breaking up data
DESC


21. Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
COUNT()
LIKE
char(size)
Logical Operators


22. All extra whitespace within a SQL statement is is ignored when that statement is processed.
Column
Use of Whitespace
Nested Subquery
Always define Primary Keys


23. Combines rows from a SELECT statement's results table into groups in which specified columns have the same value.
GROUP BY
Nested Subquery
UPDATE
DESC


24. Specify one or more columns on which to order the display.
Keyword
ORDER BY
Nested Subquery
Datatype


25. Number value with a maximum number of digits of "size" total - with a maximum number of "d" digits to the right of the decimal.
SQL (Structured Query Language)
SELECT *
number(size -d)
SELECT Statement


26. A record in a table
Row
DELETE
Terminating Statements
Always define Primary Keys


27. Database software (an application)
ANY
DELETE
DBMS - Database Management System
char(size)


28. Variable-length character string. Max size is specified in parenthesis.
ANY
varchar(size)
Breaking up data
Keyword


29. Data must be broken into multiple columns correctly. For example - city - state - and zip should always separate columns.
SELECT *
DISTINCT
FROM
Breaking up data


30. Allows you to delete selected rows.
WHERE
HAVING
DELETE
char(size)


31. _______ column name FROM table name
char(size)
AS
DELETE
SELECT


32. Alias
AS
application
SQL (Structured Query Language)
UPDATE


33. Lets you change the values in one or more selected rows of a table.
SUM()
UPDATE
Aggregate Functions
AS


34. Denotes that the search condition is TRUE for at least one element that the subquery returns.
AS
Use of Whitespace
ASC
ANY


35. Takes a single numeric or alphabetic cloumn and finds the LOWEST constant value within it.
Self-Join
Simple Subquery
MIN()
ANY


36. When selecting multiple columns be sure to specify a _____ BETWEEN each column name but NOT after the last column name.
Commas
IN
DELETE
AS


37. Provides a numerical tally of how many rows meet a specific set of criteria.
SELECT Statement
COUNT()
DISTINCT
Primary Key


38. Limits the rows that appear in the result to those matching a specified condition
Commas
SQL (Structured Query Language)
WHERE
Table


39. Ascending
ASC
SQL (Structured Query Language)
Datatype
Terminating Statements


40. Used to select all the information in a specified column.
number(size -d)
varchar(size)
SELECT *
ASC


41. The container - usually a file or set of files - to store organized data
DELETE
Database
WHERE
varchar(size)


42. Takes all of the values in that column and adds them together. Only works on columns containing numeric data.
Breaking up data
SUM()
WHERE
Always define Primary Keys


43. Specifies the tables or views from which rows and columns are retrieved
Always define Primary Keys
FROM
AVG()
SQL extensions


44. A single field in a table. All tables are made up of one or more columns.
ORDER BY
Column
Self-Join
Aggregate Functions


45. Used to nest subqueries within another subquery.
DISTINCT
Nested Subquery
HAVING
GROUP BY


46. A column or set of columns whose values uniquely identify every row in a table.
INSERT INTO
Primary Key
AVG()
Datatype


47. Simplest type of subquery.
WHERE
DISTINCT
Simple Subquery
MIN()


48. A popular open source database
mysql
SQL extensions
Row
MAX()


49. Primary way to do a query in SQL
AVG()
SELECT Statement
SQL extensions
GROUP BY


50. A reserved word that is part of the SQL language. Never name a table or column using a keyword.
SELECT Statement
Keyword
Column
Self-Join