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01
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What is the difference between 'UNION' and 'UNION ALL' in SQL queries?
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A.
'UNION ALL' only increases database security.
B.
'UNION' only changes table schemas.
C.
'UNION' removes duplicate lines, 'UNION ALL' includes all lines.
D.
'UNION' and 'UNION ALL' are used for data backup operations only.
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