text: -- e_fkey.test
  -- 
  -- execsql {
  --     CREATE TABLE p(a, b, PRIMARY KEY(a, b));
  --     CREATE TABLE cd(c, d, 
  --       FOREIGN KEY(c, d) REFERENCES p DEFERRABLE INITIALLY DEFERRED);
  --     CREATE TABLE ci(c, d, 
  --       FOREIGN KEY(c, d) REFERENCES p DEFERRABLE INITIALLY IMMEDIATE);
  --     BEGIN;
  -- }
  CREATE TABLE p(a, b, PRIMARY KEY(a, b));
  CREATE TABLE cd(c, d, 
  FOREIGN KEY(c, d) REFERENCES p DEFERRABLE INITIALLY DEFERRED);
  CREATE TABLE ci(c, d, 
  FOREIGN KEY(c, d) REFERENCES p DEFERRABLE INITIALLY IMMEDIATE);
  BEGIN;