Terry wrote:
Hello, I am looking for a way to copy all the data from one table to another on a regular basis, every 5 minutes let's say. INSERT INTO table2 SELECT * FROM table1; The above will copy all the data as is and insert it into the other table. What happens if I rerun it again? Will it just append table1 again into table2? How can I have it only insert rows that are different? Would that be a program to lookup the most last record in table 1 and then a query to only select after that row for the insert into table2?
both tables should have a serial 'id' (or bigserial if you expect over 2 billion entries), and use something like ...
insert into table2 select * from table1 as t1 where t1.id > (select max(t.id) from table2 as t);
i haven't tested this but I think it should work. as long as id is indexed in both tables
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