COP 4710 Midterm

What are the wildcards used for pattern matching.?

%

What is BREAK?

BREAK command clarifies reports by suppressing repeated values, skipping lines & allowing for controlled break points.

What are the data types allowed in a table?

CHAR, VARCHAR2, NUMBER, DATE, RAW, LONG and LONG RAW.

What is COLUMN ?

COLUMN command defines column headings & format data values.

What is Correlated Sub-query?

Correlated Sub-query is a sub-query that is evaluated once for each row processed by the parent statement. Parent statement can be Select, Update or Delete. Use CRSQ to answer multipart questions whose answer depends on the value in each row processed by parent statement.

What is correlated sub-query?

Correlated sub-query is a sub-query, which has reference to the main query.

Which SQL statement is used to delete data from a database?

DELETE

With SQL, how can you delete the records where the "FirstName" is "Peter" in the Persons Table?

DELETE FROM Persons WHERE FirstName = 'Peter'

Which SQL statement is used to insert new data in a database?

INSERT INTO

With SQL, how can you insert "Olsen" as the "LastName" in the "Persons" table?

INSERT INTO Persons (LastName) VALUES ('Olsen')

With SQL, how can you insert a new record into the "Persons" table?

INSERT INTO Persons VALUES ('Jimmy', 'Jackson')

What operator tests column for the absence of data?

IS NULL operator.

What is an integrity constraint?

Integrity constraint is a rule that restricts values to a column in a table.

What is JOIN?

JOIN is the form of SELECT command that combines info from two or more tables.

What operator performs pattern matching?

LIKE operator.

What is referential integrity constraint?

Maintaining data integrity through a set of rules that restrict the values of one or more columns of the tables based on the values of primary key or unique key of the referenced table.

Which SQL keyword is used to sort the result-set?

ORDER BY

Which SQL statement is used to extract data from a database?

SELECT

With SQL, how do you select all the columns from a table named "Persons"?

SELECT * FROM Persons

With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?

SELECT * FROM Persons ORDER BY FirstName DESC

With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an "a"?

SELECT * FROM Persons WHERE FirstName LIKE 'a%'

With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" is "Peter"?

SELECT * FROM Persons WHERE FirstName='Peter'

With SQL, how do you select all the records from a table named "Persons" where the "FirstName" is "Peter" and the "LastName" is "Jackson"?

SELECT * FROM Persons WHERE FirstName='Peter' AND LastName='Jackson'

With SQL, how do you select all the records from a table named "Persons" where the "LastName" is alphabetically between (and including) "Hansen" and "Pettersen"?

SELECT * FROM Persons WHERE LastName BETWEEN 'Hansen' AND 'Pettersen'

With SQL, how can you return the number of records in the "Persons" table?

SELECT COUNT(*) FROM Persons

Which SQL statement is used to return only different values?

SELECT DISTINCT

With SQL, how do you select a column named "FirstName"?

SELECT FirstName FROM Persons

What is SET?

SET command changes the system variables affecting the report environment.

What is SQL?

SQL is an English like language consisting of commands to store, retrieve, maintain & regulate access to your database.

What is the sub-query?

Sub-query is a query whose return values are used in filtering conditions of the main query.

T OR F: The OR operator displays a record if ANY conditions listed are true. The AND operator displays a record if ALL of the conditions listed are true.

True

State true or false. EXISTS, SOME, ANY are operators in SQL?

True.

Which SQL statement is used to update data in a database?

UPDATE

How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?

UPDATE Persons SET LastName='Nilsen' WHERE LastName='Hansen'

What is Union?

Union is the product of two or more tables.