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Introduction to SQL

Introduction to SQL
SUM, AVG, MIN, and MAX can only be used with numeric columns.

True
False

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Introduction to SQL
Table employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM employee WHERE SALARY > ALL (SELECT SALARY FROM EMPLOYEE);prints

5
10
0
9

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Introduction to SQL
In SQL, which command is used to change a table's storage characteristics?

ALTER TABLE
MODIFY TABLE
CHANGE TABLE
None of these

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Introduction to SQL
The command to eliminate a table from a database is:

REMOVE TABLE CUSTOMER;
DROP TABLE CUSTOMER;
UPDATE TABLE CUSTOMER;
DELETE TABLE CUSTOMER;

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Introduction to SQL
Which SQL statement is used to delete data FROM a database?

COLLAPSE
DELETE
ALTER
REMOVE

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Introduction to SQL
Which of the following SQL commands is used to retrieve data?

SELECT
JOIN
INSERT
DELETE

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