int4.out

来自「PostgreSQL7.4.6 for Linux」· OUT 代码 · 共 298 行

--
-- INT4
-- WARNING: int4 operators never check for over/underflow!
-- Some of these answers are consequently numerically incorrect.
--
CREATE TABLE INT4_TBL(f1 int4);
INSERT INTO INT4_TBL(f1) VALUES ('0');
INSERT INTO INT4_TBL(f1) VALUES ('123456');
INSERT INTO INT4_TBL(f1) VALUES ('-123456');
INSERT INTO INT4_TBL(f1) VALUES ('34.5');
ERROR:  invalid input syntax for integer: "34.5"
-- largest and smallest values 
INSERT INTO INT4_TBL(f1) VALUES ('2147483647');
INSERT INTO INT4_TBL(f1) VALUES ('-2147483647');
-- bad input values -- should give warnings 
INSERT INTO INT4_TBL(f1) VALUES ('1000000000000');
ERROR:  value "1000000000000" is out of range for type integer
INSERT INTO INT4_TBL(f1) VALUES ('asdf');
ERROR:  invalid input syntax for integer: "asdf"
SELECT '' AS five, INT4_TBL.*;
 five |     f1      
------+-------------
      |           0
      |      123456
      |     -123456
      |  2147483647
      | -2147483647
(5 rows)

SELECT '' AS four, i.* FROM INT4_TBL i WHERE i.f1 <> int2 '0';
 four |     f1      
------+-------------
      |      123456
      |     -123456
      |  2147483647
      | -2147483647
(4 rows)

SELECT '' AS four, i.* FROM INT4_TBL i WHERE i.f1 <> int4 '0';
 four |     f1      
------+-------------
      |      123456
      |     -123456
      |  2147483647
      | -2147483647
(4 rows)

SELECT '' AS one, i.* FROM INT4_TBL i WHERE i.f1 = int2 '0';
 one | f1 
-----+----
     |  0
(1 row)

SELECT '' AS one, i.* FROM INT4_TBL i WHERE i.f1 = int4 '0';
 one | f1 
-----+----
     |  0
(1 row)

SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 < int2 '0';
 two |     f1      
-----+-------------
     |     -123456
     | -2147483647
(2 rows)

SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 < int4 '0';
 two |     f1      
-----+-------------
     |     -123456
     | -2147483647
(2 rows)

SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 <= int2 '0';
 three |     f1      
-------+-------------
       |           0
       |     -123456
       | -2147483647
(3 rows)

SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 <= int4 '0';
 three |     f1      
-------+-------------
       |           0
       |     -123456
       | -2147483647
(3 rows)

SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 > int2 '0';
 two |     f1     
-----+------------
     |     123456
     | 2147483647
(2 rows)

SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 > int4 '0';
 two |     f1     
-----+------------
     |     123456
     | 2147483647
(2 rows)

SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 >= int2 '0';
 three |     f1     
-------+------------
       |          0
       |     123456
       | 2147483647
(3 rows)

SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 >= int4 '0';
 three |     f1     
-------+------------
       |          0
       |     123456
       | 2147483647
(3 rows)

-- positive odds 
SELECT '' AS one, i.* FROM INT4_TBL i WHERE (i.f1 % int2 '2') = int2 '1';
 one |     f1     
-----+------------
     | 2147483647
(1 row)

-- any evens 
SELECT '' AS three, i.* FROM INT4_TBL i WHERE (i.f1 % int4 '2') = int2 '0';
 three |   f1    
-------+---------
       |       0
       |  123456
       | -123456
(3 rows)

SELECT '' AS five, i.f1, i.f1 * int2 '2' AS x FROM INT4_TBL i;
 five |     f1      |    x    
------+-------------+---------
      |           0 |       0
      |      123456 |  246912
      |     -123456 | -246912
      |  2147483647 |      -2
      | -2147483647 |       2
(5 rows)

SELECT '' AS five, i.f1, i.f1 * int4 '2' AS x FROM INT4_TBL i;
 five |     f1      |    x    
------+-------------+---------
      |           0 |       0
      |      123456 |  246912
      |     -123456 | -246912
      |  2147483647 |      -2
      | -2147483647 |       2
(5 rows)

SELECT '' AS five, i.f1, i.f1 + int2 '2' AS x FROM INT4_TBL i;
 five |     f1      |      x      
------+-------------+-------------
      |           0 |           2
      |      123456 |      123458
      |     -123456 |     -123454
      |  2147483647 | -2147483647
      | -2147483647 | -2147483645
(5 rows)

SELECT '' AS five, i.f1, i.f1 + int4 '2' AS x FROM INT4_TBL i;
 five |     f1      |      x      
------+-------------+-------------
      |           0 |           2
      |      123456 |      123458
      |     -123456 |     -123454
      |  2147483647 | -2147483647
      | -2147483647 | -2147483645
(5 rows)

SELECT '' AS five, i.f1, i.f1 - int2 '2' AS x FROM INT4_TBL i;
 five |     f1      |     x      
------+-------------+------------
      |           0 |         -2
      |      123456 |     123454
      |     -123456 |    -123458
      |  2147483647 | 2147483645
      | -2147483647 | 2147483647
(5 rows)

SELECT '' AS five, i.f1, i.f1 - int4 '2' AS x FROM INT4_TBL i;
 five |     f1      |     x      
------+-------------+------------
      |           0 |         -2
      |      123456 |     123454
      |     -123456 |    -123458
      |  2147483647 | 2147483645
      | -2147483647 | 2147483647
(5 rows)

SELECT '' AS five, i.f1, i.f1 / int2 '2' AS x FROM INT4_TBL i;
 five |     f1      |      x      
------+-------------+-------------
      |           0 |           0
      |      123456 |       61728
      |     -123456 |      -61728
      |  2147483647 |  1073741823
      | -2147483647 | -1073741823
(5 rows)

SELECT '' AS five, i.f1, i.f1 / int4 '2' AS x FROM INT4_TBL i;
 five |     f1      |      x      
------+-------------+-------------
      |           0 |           0
      |      123456 |       61728
      |     -123456 |      -61728
      |  2147483647 |  1073741823
      | -2147483647 | -1073741823
(5 rows)

--
-- more complex expressions
--
-- variations on unary minus parsing
SELECT -2+3 AS one;
 one 
-----
   1
(1 row)

SELECT 4-2 AS two;
 two 
-----
   2
(1 row)

SELECT 2- -1 AS three;
 three 
-------
     3
(1 row)

SELECT 2 - -2 AS four;
 four 
------
    4
(1 row)

SELECT int2 '2' * int2 '2' = int2 '16' / int2 '4' AS true;
 true 
------
 t
(1 row)

SELECT int4 '2' * int2 '2' = int2 '16' / int4 '4' AS true;
 true 
------
 t
(1 row)

SELECT int2 '2' * int4 '2' = int4 '16' / int2 '4' AS true;
 true 
------
 t
(1 row)

SELECT int4 '1000' < int4 '999' AS false;
 false 
-------
 f
(1 row)

SELECT 4! AS twenty_four;
 twenty_four 
-------------
          24
(1 row)

SELECT !!3 AS six;
 six 
-----
   6
(1 row)

SELECT 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 AS ten;
 ten 
-----
  10
(1 row)

SELECT 2 + 2 / 2 AS three;
 three 
-------
     3
(1 row)

SELECT (2 + 2) / 2 AS two;
 two 
-----
   2
(1 row)