Oracle
1Z0-071 · Question #339
1Z0-071 Question #339: Real Exam Question with Answer & Explanation
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Question
Which two statements are true regarding the UNION and UNION ALL operators? (Choose two.)
Options
- AThe output is sorted by the UNION ALL operator
- BThe names of columns selected in each SELECT statement must be identical
- CThe number of columns selected in each SELECT statement must be identical
- DDuplicates are eliminated automatically by the UNION ALL operator
- ENULLS are not ignored during duplicate checking
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