Replicate Data in same table with modified Relations in SQL

Question

We had a requirement to copy data from one company to another, for this we need to replicate all the data present in one table into the same table but with a different company i

Answer 1

You could use this:

WITH tmp_table AS
(
    SELECT o.id AS id_old, n.id AS id_new
    FROM combovalues o
    INNER JOIN combovalues n 
    ON o.fieldname = n.fieldname AND o.fieldvalue = n.fieldvalue
    WHERE o.companyid = 1 AND n.companyid = 2
)
INSERT INTO employee (fname, department, catid, companyid)
SELECT fname, d.id_new, c.id_new, 2
FROM employee e
LEFT JOIN tmp_table d
ON e.department = d.id_old
LEFT JOIN tmp_table c
ON e.catid = c.id_old
WHERE companyid = 1;

Tested in rextester