SELECT rowid FROM xt1 WHERE a IS NOT NULL;


  SELECT a,b,c,d FROM t1 EXCEPT SELECT rowid,b,c,d FROM xt1;
  SELECT rowid,b,c,d FROM xt1 EXCEPT SELECT a,b,c,d FROM t1;


  DELETE FROM xt1 WHERE rowid=5;
  INSERT INTO xt1(rowid,a,b,c,d) VALUES(99,'hello',1099,2022,NULL);
  SELECT * FROM chnglog ORDER BY rowid;


  PRAGMA integrity_check;


  PRAGMA integrity_check;


  PRAGMA integrity_check;


  DELETE FROM t1;
  WITH RECURSIVE c(i) AS (VALUES(1) UNION ALL SELECT i+1 FROM c WHERE i<10)
   INSERT INTO t1(a,b,c,d) SELECT i,i,i,i FROM c;
  UPDATE xt1c SET c=NULL WHERE rowid=5;
  PRAGMA integrity_check;


  DELETE FROM t1;
  WITH RECURSIVE c(i) AS (VALUES(1) UNION ALL SELECT i+1 FROM c WHERE i<10)
   INSERT INTO t1(a,b,c,d) SELECT i,i,i,i FROM c;
  UPDATE xt1c SET c=99 WHERE rowid IN (5,7,9);
  SELECT c FROM t1 ORDER BY c;


  UPDATE xt1 SET c=99 WHERE rowid IN (5,7,9);
  PRAGMA integrity_check;