CREATE TABLE "germanic_origins" (
  "proto_germanic" text,
  "west_germanic" text,
  "old_english" text,
  "german" text,
  "dutch" text
);

Question: What's the Proto-Germanic when the Old English is /d/?
SQL: SELECT "proto_germanic" FROM "germanic_origins" WHERE "old_english"='/d/';

Question: What's the Proto Germanic when then German is /s/ or /ts/?
SQL: SELECT "proto_germanic" FROM "germanic_origins" WHERE "german"='/s/ or /ts/';

Question: What's the Dutch when then Old English is /d/?
SQL: SELECT "dutch" FROM "germanic_origins" WHERE "old_english"='/d/';

Question: What's the West Germanic when the German is /s/ or /ts/?
SQL: SELECT "west_germanic" FROM "germanic_origins" WHERE "german"='/s/ or /ts/';

Question: What's the Proto-Germanic when the German is /t/?
SQL: SELECT "proto_germanic" FROM "germanic_origins" WHERE "german"='/t/';