numerology.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

--
-- NUMEROLOGY
-- Test various combinations of numeric types and functions.
--
--
-- Test implicit type conversions
-- This fails for Postgres v6.1 (and earlier?)
--  so let's try explicit conversions for now - tgl 97/05/07
--
CREATE TABLE TEMP_FLOAT (f1 FLOAT8);
INSERT INTO TEMP_FLOAT (f1)
  SELECT float8(f1) FROM INT4_TBL;
INSERT INTO TEMP_FLOAT (f1)
  SELECT float8(f1) FROM INT2_TBL;
SELECT '' AS ten, f1 FROM TEMP_FLOAT
  ORDER BY f1;
 ten |     f1      
-----+-------------
     | -2147483647
     |     -123456
     |      -32767
     |       -1234
     |           0
     |           0
     |        1234
     |       32767
     |      123456
     |  2147483647
(10 rows)

-- int4
CREATE TABLE TEMP_INT4 (f1 INT4);
INSERT INTO TEMP_INT4 (f1)
  SELECT int4(f1) FROM FLOAT8_TBL
  WHERE (f1 > -2147483647) AND (f1 < 2147483647);
INSERT INTO TEMP_INT4 (f1)
  SELECT int4(f1) FROM INT2_TBL;
SELECT '' AS nine, f1 FROM TEMP_INT4
  ORDER BY f1;
 nine |   f1   
------+--------
      | -32767
      |  -1234
      |  -1004
      |    -35
      |      0
      |      0
      |      0
      |   1234
      |  32767
(9 rows)

-- int2
CREATE TABLE TEMP_INT2 (f1 INT2);
INSERT INTO TEMP_INT2 (f1)
  SELECT int2(f1) FROM FLOAT8_TBL
  WHERE (f1 >= -32767) AND (f1 <= 32767);
INSERT INTO TEMP_INT2 (f1)
  SELECT int2(f1) FROM INT4_TBL
  WHERE (f1 >= -32767) AND (f1 <= 32767);
SELECT '' AS five, f1 FROM TEMP_INT2
  ORDER BY f1;
 five |  f1   
------+-------
      | -1004
      |   -35
      |     0
      |     0
      |     0
(5 rows)

--
-- Group-by combinations
--
CREATE TABLE TEMP_GROUP (f1 INT4, f2 INT4, f3 FLOAT8);
INSERT INTO TEMP_GROUP
  SELECT 1, (- i.f1), (- f.f1)
  FROM INT4_TBL i, FLOAT8_TBL f;
INSERT INTO TEMP_GROUP
  SELECT 2, i.f1, f.f1
  FROM INT4_TBL i, FLOAT8_TBL f;
SELECT DISTINCT f1 AS two FROM TEMP_GROUP;
 two 
-----
   1
   2
(2 rows)

SELECT f1 AS two, max(f3) AS max_float, min(f3) as min_float
  FROM TEMP_GROUP
  GROUP BY f1
  ORDER BY two, max_float, min_float;
 two |      max_float       |       min_float       
-----+----------------------+-----------------------
   1 | 1.2345678901234e+200 |                     0
   2 |                    0 | -1.2345678901234e+200
(2 rows)

-- GROUP BY a result column name is not legal per SQL92, but we accept it
-- anyway (if the name is not the name of any column exposed by FROM).
SELECT f1 AS two, max(f3) AS max_float, min(f3) AS min_float
  FROM TEMP_GROUP
  GROUP BY two
  ORDER BY two, max_float, min_float;
 two |      max_float       |       min_float       
-----+----------------------+-----------------------
   1 | 1.2345678901234e+200 |                     0
   2 |                    0 | -1.2345678901234e+200
(2 rows)

SELECT f1 AS two, (max(f3) + 1) AS max_plus_1, (min(f3) - 1) AS min_minus_1
  FROM TEMP_GROUP
  GROUP BY f1
  ORDER BY two, min_minus_1;
 two |      max_plus_1      |      min_minus_1      
-----+----------------------+-----------------------
   1 | 1.2345678901234e+200 |                    -1
   2 |                    1 | -1.2345678901234e+200
(2 rows)

SELECT f1 AS two,
       max(f2) + min(f2) AS max_plus_min,
       min(f3) - 1 AS min_minus_1
  FROM TEMP_GROUP
  GROUP BY f1
  ORDER BY two, min_minus_1;
 two | max_plus_min |      min_minus_1      
-----+--------------+-----------------------
   1 |            0 |                    -1
   2 |            0 | -1.2345678901234e+200
(2 rows)

DROP TABLE TEMP_INT2;
DROP TABLE TEMP_INT4;
DROP TABLE TEMP_FLOAT;
DROP TABLE TEMP_GROUP;