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create table the_table (col3 SERIAL, col2 varchar, col1 varchar, PRIMARY KEY(col3)); INSERT INTO the_table (col2,col1) VALUES ('x','a'), ('x','b'), ('y','c'), ('y','d'), ('z','e'), ('z','f');
CREATE TABLE
INSERT 0 6
SELECT col2, MIN(col3) AS col3, MIN(col1) AS col1 FROM the_table GROUP BY col2;
col2
col3
col1
z
5
e
y
3
c
x
1
a
SELECT 3