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Introduction to SQL

Introduction to SQL
The condition in a WHERE clause can refer to only one value.

False
True

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Introduction to SQL
Which of the following is illegal?

SELECT SYSDATE - (SYSDATE + 2) FROM DUAL;
SELECT SYSDATE - (SYSDATE - 2) FROM DUAL;
SELECT SYSDATE - SYSDATE FROM DUAL;
None of these

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Introduction to SQL
The ADD command is used to enter one row of data or to add multiple rows as a result of a query.

True
False

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Introduction to SQL
If you are going to use a combination of three or more AND and OR conditions, it is often easier to use the NOT and NOT IN operators.

False
True

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Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

COMMIT
TRUNCATE
DELETE
ROLLBACK

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Introduction to SQL
The SQL statement: SELECT Name, COUNT(*) FROM NAME_TABLE; counts the number of name rows and displays this total in a table with a single row and a single column.

True
False

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