text: CREATE TABLE t11 (
      time1 int4 NOT NULL,
      time2 int4 NOT NULL,
      prov int4 NOT NULL,
      c1 int4 NOT NULL,
      c2 float4 NOT NULL
  );
  
  CREATE TABLE t12 (
      time1 int4 NOT NULL,
      time2 int4 NOT NULL,
      c1 int4 NOT NULL,
      c2 float4 NOT NULL
  );
  