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Introduction to SQL

Introduction to SQL
The SELECT statement SELECT 'Hi' FROM DUAL WHERE NULL = NULL; Outputs

Nothing
TRUE
FLASE
Hi

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Introduction to SQL
Scalar aggregate are multiple values returned from an SQL query that includes an aggregate function.

True
False

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Introduction to SQL
The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.

False
True

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Introduction to SQL
Which of the following group functions ignore NULL values?

All of these
COUNT
MAX
SUM

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Introduction to SQL
________ was adopted as a national standard by ANSI in 1992.

Microsoft Access
Oracle
DBase
SQL

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

COMMIT
DELETE
TRUNCATE
ROLLBACK

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