postgresqlHow do I use PostgreSQL's UNION ALL statement?
The PostgreSQL UNION ALL statement is used to combine the result sets of two or more SELECT statements into a single result set. It does not remove duplicate rows from the result set, unlike the UNION statement.
Example code
SELECT * FROM table1
UNION ALL
SELECT * FROM table2;The example code above will combine the results from both table1 and table2 into a single result set.
Code explanation
- SELECT: specifies the columns to be returned by the query
- FROM: specifies the table(s) from which to retrieve the data
- UNION ALL: combines the result sets of two or more SELECT statements into a single result set
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