Introduction to SQL
SQL can be used to:

create database structures only.
query database data only.
modify database data only.
All of these

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Introduction to SQL
The HAVING clause does which of the following?

Acts like a WHERE clause but is used for rows rather than columns.
Acts EXACTLY like a WHERE clause.
Acts like a WHERE clause but is used for columns rather than groups.
Acts like a WHERE clause but is used for groups rather than rows.

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