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This query is correct: SELECT * FROM employee WHERE age IN (20,21,22);
False
True
This query is correct: SELECT column1 FROM table1 UNION SELECT column2 FROM table2;
False
True
A SELECT statement is a data definition language (DDL).
False
True
Indexes allow the database application to find data slowly.
False
True
A primary key column can contain NULL values.
False
True
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