create table wtransaction
(
emailfrom varchar(20) NOT NULL,
emailto VARCHAR(20) NOT NULL
);
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','gaukaugaukau@gmail.com');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','sunny.31');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','kaushik1');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','kalci1');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','kaka');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','gaukaugaukau1@gmail.com');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','gaukaugaukau2@gmail.com');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','gaukaugaukau3@gmail.com');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau@gmail.com','gaukaugaukau4@gmail.com');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau1@gmail.com','kaushik1');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau2@gmail.com','kalci1');
insert into wtransaction (emailfrom,emailto) values ('gaukaugaukau4@gmail.com','kaka');
create table email
(
email varchar(20) NOT NULL
);
insert into email (email) values ('gaukaugaukau@gmail.com');
insert into email (email) values ('gaukaugaukau1@gmail.com');
insert into email (email) values ('gaukaugaukau2@gmail.com');
insert into email (email) values ('gaukaugaukau3@gmail.com');
insert into email (email) values ('gaukaugaukau4@gmail.com');
insert into email (email) values ('sunny.31');
insert into email (email) values ('kaushik1');
insert into email (email) values ('kalci1');
insert into email (email) values ('kaka');
select * from wtransaction wt where NOT EXISTS(select * from email e where NOT EXISTS (select * from wtransaction w where wt.emailto=e.email ));
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