lets say i have two tables:

module
---------
VARCHAR module_name
INTEGER module_id

module_config
----------------
INTEGER module_id
VARCHAR config_name
VARCHAR config_value


config item names and values are rather arbitrary and depend on the module.

each module can have zero to many config items..

How do i find out the id of a module with the following two module_config 
entries:
config_name='mapping' and config_value='true'
and 
config_name='loc_enabled' and config_value='true'

it seems like i would have to use a subquery to check two rows at the same 
time.  I wasn't really sure how to express it in SQL though.




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