text: -- tkt3824.test
  -- 
  -- db eval {
  --     CREATE TABLE t1(a,b);
  --     INSERT INTO t1 VALUES(1,NULL);
  --     INSERT INTO t1 VALUES(9,NULL);
  --     INSERT INTO t1 VALUES(5,NULL);
  --     INSERT INTO t1 VALUES(123,NULL);
  --     INSERT INTO t1 VALUES(-10,NULL);
  --     CREATE UNIQUE INDEX t1b ON t1(b);
  -- }
  CREATE TABLE t1(a,b);
  INSERT INTO t1 VALUES(1,NULL);
  INSERT INTO t1 VALUES(9,NULL);
  INSERT INTO t1 VALUES(5,NULL);
  INSERT INTO t1 VALUES(123,NULL);
  INSERT INTO t1 VALUES(-10,NULL);
  CREATE UNIQUE INDEX t1b ON t1(b);