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What does '_' in EJB QL Signify  RSS feed

 
sopal Pal
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Hi
I am slghtly confused as to the exact meaning of '_' in the QL.
Does this impy - 1 element OR does it imply 0 or 1 element.
Thanks
Sumit
 
Alibabra Sanjie
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Must be one and only one character
 
Consider Paul's rocket mass heater.
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