CREATE TABLE R
(a int,b int,c int);
insert into R values (1,5,9);
insert into R values (5,9,7);
insert into R values (8,7,9);
insert into R values (5,5,0);
insert into R values (4,1,1);
insert into R values (7,3,4);
insert into R values (5,6,7);
insert into R values (1,7,3);
insert into R values (9,5,6);
insert into R values (6,4,7);
select count(*) from R where a = a;
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