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14.2. The from clause

The simplest possible Hibernate query is of the form: 
from eg.Cat
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This returns all instances of the class eg.Cat. You do not usually need to qualify the class name, since auto-import is the default. For example: 
from Cat
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In order to refer to the Cat in other parts of the query, you will need to assign an alias. For example: 
from Cat as cat
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This query assigns the alias cat to Cat instances, so you can use that alias later in the query. The as keyword is optional. You could also write: 
from Cat cat
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Multiple classes can appear, resulting in a cartesian product or "cross" join. 
from Formula, Parameter
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from Formula as form, Parameter as param
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It is good practice to name query aliases using an initial lowercase as this is consistent with Java naming standards for local variables (e.g. domesticCat).
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