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Arif
CREATE TABLE table1(Date DATE, Val INTEGER); CREATE TABLE table2(Date DATE, Val INTEGER); CREATE TABLE table3(Date DATE, Val INTEGER); INSERT INTO table1 values('2013-01-01', 4); INSERT INTO table1 values('2013-01-02', 3); INSERT INTO table1 values('2013-01-04', 2); INSERT INTO table2 values('2013-01-01', 5); INSERT INTO table2 values('2013-01-03', 4); INSERT INTO table2 values('2013-01-04', 1); INSERT INTO table3 values('2013-01-02', 3); INSERT INTO table3 values('2013-01-03', 1); INSERT INTO table3 values('2013-01-06', 8); select Date,SUM(Val) from ( SELECT Date,Val FROM table1 Union SELECT Date, Val FROM table2 Union SELECT Date, Val FROM table3) as c group by c.Date
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