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Developer-C 11.1
3.0
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DROP TABLE IF EXISTS companies; CREATE TABLE companies (ccyID varchar(55), ccyname varchar(55), PrimconID varchar(55)); INSERT INTO companies (ccyID, ccyname, PrimconID) VALUES ('aaaaaaa', 'Company A', NULL), ('bbbbbbb', 'Company B', NULL), ('ccccccc', 'Company C', 'vvvvvvv'); DROP TABLE IF EXISTS contacts; CREATE TABLE contacts (conID varchar(55), firstname varchar(55), lastname varchar(55), ccyID varchar(55)); INSERT INTO contacts (conID, firstname, lastname, ccyID) VALUES ('zzzzzzz', 'Stand', 'Alone', NULL), ('yyyyyyy', 'Only', 'Contact', 'aaaaaaa'), ('xxxxxxx', 'CompanyB', 'First', 'bbbbbbb'), ('wwwwwww', 'CompanyB', 'Second', 'bbbbbbb'), ('vvvvvvv', 'CompanyC', 'Only', 'ccccccc'); WITH cte AS ( SELECT ccyID, MAX(conID) AS conID FROM contacts GROUP BY ccyID HAVING COUNT(*) = 1 ) SELECT t.conID, c.ccyID FROM companies c INNER JOIN cte t ON c.ccyID = t.ccyID WHERE c.PrimconID IS NULL;
conID
ccyID
yyyyyyy
aaaaaaa