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Q4
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--PostgreSQL 9.6 --'\\' is a delimiter CREATE TABLE spam (Name CHAR(20), Address CHAR(20), ID INTEGER, SameFam INTEGER); INSERT INTO spam(Name,Address,ID,SameFam) VALUES ('Alice','A',10,NULL), ('Bob','B',15,NULL), ('Carmen','C',22,NULL), ('Diego','A',9,10), ('Ella','B',3,15), ('Frankhad','D',11,NULL) ; CREATE TABLE table3 AS SELECT Name as name1,Address as Address1,ID as ID1,SameFam as SameFam1 From spam WHERE SameFam IS NULL; CREATE TABLE table4 AS SELECT Name as name2,Address,ID,SameFam From spam WHERE SameFam IS NOT NULL; SELECT * FROM spam EXCEPT SELECT name1,Address1,ID1,SameFam1 FROM table3 INNER JOIN table4 ON table3.id1 = table4.SameFam ORDER BY NAME;
absolute service time: 0,53 sec
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name
address
id
samefam
1
Carmen
C
22
NULL
2
Diego
A
9
10
3
Ella
B
3
15
4
Frankhad
D
11
NULL