Oracle
1Z0-082 · Question #9
Which two statements are true regarding the UNION and UNION ALL operators? (Choose two.)
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SQL and PL/SQL
Question
Which two statements are true regarding the UNION and UNION ALL operators? (Choose two.)
Options
- ADuplicates are eliminated automatically by the UNION ALL operator
- BThe number of columns selected in each SELECT statement must be identical
- CThe names of columns selected in each SELECT statement must be identical
- DThe output is sorted by the UNION ALL operator
- ENULLS are not ignored during duplicate checking
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Topics
#UNION#UNION ALL#set operators#duplicate elimination