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PROFESSIONAL-CLOUD-DEVELOPER · Question #61
You have two tables in an ANSI-SQL compliant database with identical columns that you need to quickly combine into a single table, removing duplicate rows from the result set. What should you do?
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Working with Data Storage and Databases
Question
You have two tables in an ANSI-SQL compliant database with identical columns that you need to quickly combine into a single table, removing duplicate rows from the result set. What should you do?
Options
- AQuery the tables from a Linux shell, combine the results into a single CSV, and re-import the rows
- BUse the JOIN operator in SQL to combine the tables.
- CUse nested WITH statements to combine the tables.
- DUse the UNION operator in SQL to combine the tables.
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Topics
#SQL#UNION operator#Data manipulation#Database querying