SQL Lookup table as configuration table for join

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SQL Lookup table as configuration table for join



I have a data table that looks like this


DEV_SERIAL | PIN_PAD_SERIAL|TERM_PROTOCOL| LOC_SFTWR_VRSN |DEVICE_SUBTYPE
30618334 30618334 0 K0737 0



I have a requirement for a derived column based on conditions for each one of these fields and the business wants to maintain a lookup table with all the conditions so that it can be used as a lookup table to join .
few of the conditions are



first 2 characters of dev_serial =30 and first two character of pin_pad_serial = 30 and term_protocol can be anything ( which means no filter on term protocol) and loc_sftwr_vrsn starts with alphabet or loc_sftwr_vrsn has no filter etc .



i would like to have a generic left join with this lookup table and i am confused how to design this lookup table with all these options.



could someone help me with this please ?
reply if i have not explained this enough and i can share more details .





What have you tried so far? Can you provide expected results? (It would also be helpful to provide more than 1 example).
– Larnu
Aug 10 at 15:36






What is the payload of the lookup table? that is, for each condition, what do you want to look up?
– user1443098
Aug 10 at 15:45









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