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2024.2 LTS
2025.2 LTS
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create table tablename (c1 varchar(100)); insert into tablename values(null), (''), ('N/A'), ('x')
select NULLIF(NULLIF(c1, ''), 'N/A') from tablename;
NULLIF(NULLIF(c1, ''), 'N/A')
null
null
null
x