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This interface may seem simplistic at first, but it turns out to be very powerful.The (key, value) query interface completely hides the complexities of LDAP or SQL from Postfix.IMPORTANT: When selecting a table name, it is important to select a unique name that no one else will use or guess.

Examples of lookup tables that appear often in the Postfix documentation: /etc/postfix/main.cf: alias_maps = hash:/etc/postfix/aliases (local aliasing) header_checks = regexp:/etc/postfix/header_checks (content filtering) transport_maps = hash:/etc/postfix/transport (routing table) virtual_alias_maps = hash:/etc/postfix/virtual (address rewriting) All Postfix lookup tables store information as (key, value) pairs.This is a good example of connecting complex systems with simple interfaces.Benefits of the Postfix (key, value) query interface: You can implement Postfix lookup tables first with local Berkeley DB files and then switch to LDAP or My SQL without any impact on the Postfix configuration itself, as described under "Preparing Postfix for LDAP or SQL lookups" below.Constraints can be entered in this SQL interpreter, however, they are not supported in this Intro to SQL tutorial & interpreter.They will be covered and supported in the future release of the Advanced SQL tutorial - that is, if "response" is good.

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