#From Shell/ADB no root or sqlite needed
content query --uri content://com.android.contacts/data --projection display_name:number:data4:contact_id

# with root access
/data/data/com.android.providers.contacts/databases/contacts2.db

#list tables
sqlite3 contacts2.db ".tables"

#get header for each column in contacts table
sqlite3 contacts2.db "PRAGMA table_info(contacts)"

#find contact name by phone number
SELECT display_name FROM raw_contacts WHERE _id = (select raw_contact_id from phone_lookup where normalized_number = "+12395555555");

#find phone number by name
SELECT normalized_number FROM phone_lookup WHERE raw_contact_id =(SELECT raw_contact_id FROM data WHERE data1 LIKE 'John Smith');