When encountering the error 42P21: Collation Mismatch in PostgreSQL, follow these immediate actions for investigation:
SELECT datcollate FROM pg_database WHERE datname = 'your_database_name';
SELECT column_name, collation_name FROM information_schema.columns WHERE table_name = 'your_table_name';
COLLATE clause in your SQL query. For example, if you're comparing two columns with different collations, you can explicitly set the collation for the operation:SELECT * FROM table1 t1 JOIN table2 t2 ON t1.text_column COLLATE "en_US" = t2.text_column COLLATE "en_US";
Replace "en_US" with the appropriate collation that matches across your operations. Note that changing column or database collation might involve deeper changes and should be approached with caution.
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