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CREATE TABLE mytable ("mycolumn" varchar(33)) ; INSERT INTO mytable ("mycolumn") VALUES ('2023-08-04T09:00:32.822+00:00-1'), ('2023-08-04T09:00:32.822+00:00-1-1'), ('2023-08-04T09:00:32.822+00:00-2'), ('2023-08-04T09:00:32.822+00:00-2-1'), ('2023-08-04T09:00:32.822+00:00-3'), ('2023-08-04T09:00:32.822+00:00-4') ;
CREATE TABLE
INSERT 0 6
WITH CTE AS (select Substring(mycolumn,0,30) datetxt,MAX(split_part(mycolumn, '-', 4))::int + 1 newnum FROM mytable GROUP BY 1) SELECT CONCAT(datetxt,'-', newnum::text) FROM CTE
concat
2023-08-04T09:00:32.822+00:00-5
SELECT 1