regarding converting sql to hql

how to select column's value as null in hql?

ex: In sql

 select null as empname from emp; in sql

   In hql   

ex: select emp.empname as col1 from Employee emp;

I want to select empname' value as null as explained in the above sql query

An开发者_Python百科

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You can use cast function. Like this,

select cast(null as char) as hede from emp e 

Or use quotes and change your controls to empty checks.

select '' as hede from emp e