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--create table_1 CREATE TABLE MD001 (MRN, Name, Address) AS ( VALUES (1, 'NameName1', 'Add1') , (2, 'NameName2', 'Add2') , (3, 'NameName3', 'Add3') ) WITH DATA
CREATE TABLE PATIENT (CaseNo, FName, MName, LName) AS ( VALUES ('1', 'F', 'M', 'L') , ('2', '', '', '') ) WITH DATA
WITH U AS ( SELECT COUNT(1) AS dummy FROM NEW TABLE ( UPDATE MD001 m SET NAME = ( SELECT CASE WHEN FName IS NOT NULL AND MName IS NOT NULL AND LName IS NOT NULL THEN FName || ' ' || MName || ' ' || LName ELSE m.NAME END FROM PATIENT p --WHERE p.caseno = m.MRN WHERE fname <> '' AND mname <> '' AND lname <> '' ) WHERE EXISTS ( SELECT 1 FROM PATIENT p WHERE p.caseno = m.MRN ) ) ) SELECT * FROM MD001;
MRN
NAME
ADDRESS
1
F M L
Add1
2
F M L
Add2
3
NameName3
Add3