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create table a (val varchar(100) not null ); insert into a values ('1'); insert into a values (''); select * from a; create table b (id int, val varchar(100)); insert into b values (1, ''); insert into b values (2, null); insert into b values (3, 'v3'); select id, val as "val is null" from b where val is null; select id, val as "val = null" from b where val=''; select id, val as "val is not null" from b where val is not null;

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