pi-hole/advanced/Templates/gravity.db.schema

CREATE TABLE whitelist (domain TEXT UNIQUE NOT NULL, disabled BOOLEAN DEFAULT 0, comment TEXT, DateAdded DATETIME);
CREATE TABLE blacklist (domain TEXT UNIQUE NOT NULL, disabled BOOLEAN DEFAULT 0, comment TEXT, DateAdded DATETIME);
CREATE TABLE gravity   (domain TEXT UNIQUE NOT NULL);

CREATE VIEW vw_gravity AS SELECT DISTINCT a.domain
FROM gravity a
WHERE a.domain NOT IN (SELECT domain from whitelist WHERE disabled != 1);

CREATE VIEW vw_blacklist AS SELECT DISTINCT a.domain
FROM blacklist a
WHERE a.disabled != 1 AND
      a.domain NOT IN (SELECT domain from whitelist WHERE disabled != 1);

CREATE VIEW vw_whitelist AS SELECT DISTINCT a.domain
FROM whitelist a
WHERE a.disabled != 1;