Postgresql certain first 4 characters in string

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  PG::ForeignKeyViolation: ERROR: update or delete on table violates foreign key constraint

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  Error Code: 1055. Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column \\ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

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  Mysql locate

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