postgresqlHow do I join two tables in PostgreSQL?
Joining two tables in PostgreSQL is a common task and can be done with the JOIN statement. Here is an example of how to join two tables table1 and table2:
SELECT *
FROM table1
JOIN table2
ON table1.id = table2.table1_id;The SELECT statement is used to select the columns to be returned from the joined tables. The FROM clause specifies the tables to be joined, and the ON clause specifies the condition for the join. In this example, the id column from table1 is being compared to the table1_id column from table2.
The output of this query will be a result set containing all columns from both table1 and table2.
The parts of the query are:
SELECT: used to specify the columns to be returned from the joined tablesFROM: used to specify the tables to be joinedJOIN: used to specify the type of join to be performedON: used to specify the condition for the join
For more information, see the PostgreSQL documentation on JOIN.
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