int2.out

postgresql8.3.4源码,开源数据库

--
-- INT2
-- NOTE: int2 operators never check for over/underflow!
-- Some of these answers are consequently numerically incorrect.
--
CREATE TABLE INT2_TBL(f1 int2);
INSERT INTO INT2_TBL(f1) VALUES ('0   ');
INSERT INTO INT2_TBL(f1) VALUES ('  1234 ');
INSERT INTO INT2_TBL(f1) VALUES ('    -1234');
INSERT INTO INT2_TBL(f1) VALUES ('34.5');
ERROR:  invalid input syntax for integer: "34.5"
-- largest and smallest values
INSERT INTO INT2_TBL(f1) VALUES ('32767');
INSERT INTO INT2_TBL(f1) VALUES ('-32767');
-- bad input values -- should give errors
INSERT INTO INT2_TBL(f1) VALUES ('100000');
ERROR:  value "100000" is out of range for type smallint
INSERT INTO INT2_TBL(f1) VALUES ('asdf');
ERROR:  invalid input syntax for integer: "asdf"
INSERT INTO INT2_TBL(f1) VALUES ('    ');
ERROR:  invalid input syntax for integer: "    "
INSERT INTO INT2_TBL(f1) VALUES ('- 1234');
ERROR:  invalid input syntax for integer: "- 1234"
INSERT INTO INT2_TBL(f1) VALUES ('4 444');
ERROR:  invalid input syntax for integer: "4 444"
INSERT INTO INT2_TBL(f1) VALUES ('123 dt');
ERROR:  invalid input syntax for integer: "123 dt"
INSERT INTO INT2_TBL(f1) VALUES ('');
ERROR:  invalid input syntax for integer: ""
SELECT '' AS five, * FROM INT2_TBL;
 five |   f1   
------+--------
      |      0
      |   1234
      |  -1234
      |  32767
      | -32767
(5 rows)

SELECT '' AS four, i.* FROM INT2_TBL i WHERE i.f1 <> int2 '0';
 four |   f1   
------+--------
      |   1234
      |  -1234
      |  32767
      | -32767
(4 rows)

SELECT '' AS four, i.* FROM INT2_TBL i WHERE i.f1 <> int4 '0';
 four |   f1   
------+--------
      |   1234
      |  -1234
      |  32767
      | -32767
(4 rows)

SELECT '' AS one, i.* FROM INT2_TBL i WHERE i.f1 = int2 '0';
 one | f1 
-----+----
     |  0
(1 row)

SELECT '' AS one, i.* FROM INT2_TBL i WHERE i.f1 = int4 '0';
 one | f1 
-----+----
     |  0
(1 row)

SELECT '' AS two, i.* FROM INT2_TBL i WHERE i.f1 < int2 '0';
 two |   f1   
-----+--------
     |  -1234
     | -32767
(2 rows)

SELECT '' AS two, i.* FROM INT2_TBL i WHERE i.f1 < int4 '0';
 two |   f1   
-----+--------
     |  -1234
     | -32767
(2 rows)

SELECT '' AS three, i.* FROM INT2_TBL i WHERE i.f1 <= int2 '0';
 three |   f1   
-------+--------
       |      0
       |  -1234
       | -32767
(3 rows)

SELECT '' AS three, i.* FROM INT2_TBL i WHERE i.f1 <= int4 '0';
 three |   f1   
-------+--------
       |      0
       |  -1234
       | -32767
(3 rows)

SELECT '' AS two, i.* FROM INT2_TBL i WHERE i.f1 > int2 '0';
 two |  f1   
-----+-------
     |  1234
     | 32767
(2 rows)

SELECT '' AS two, i.* FROM INT2_TBL i WHERE i.f1 > int4 '0';
 two |  f1   
-----+-------
     |  1234
     | 32767
(2 rows)

SELECT '' AS three, i.* FROM INT2_TBL i WHERE i.f1 >= int2 '0';
 three |  f1   
-------+-------
       |     0
       |  1234
       | 32767
(3 rows)

SELECT '' AS three, i.* FROM INT2_TBL i WHERE i.f1 >= int4 '0';
 three |  f1   
-------+-------
       |     0
       |  1234
       | 32767
(3 rows)

-- positive odds 
SELECT '' AS one, i.* FROM INT2_TBL i WHERE (i.f1 % int2 '2') = int2 '1';
 one |  f1   
-----+-------
     | 32767
(1 row)

-- any evens 
SELECT '' AS three, i.* FROM INT2_TBL i WHERE (i.f1 % int4 '2') = int2 '0';
 three |  f1   
-------+-------
       |     0
       |  1234
       | -1234
(3 rows)

SELECT '' AS five, i.f1, i.f1 * int2 '2' AS x FROM INT2_TBL i;
ERROR:  smallint out of range
SELECT '' AS five, i.f1, i.f1 * int2 '2' AS x FROM INT2_TBL i
WHERE abs(f1) < 16384;
 five |  f1   |   x   
------+-------+-------
      |     0 |     0
      |  1234 |  2468
      | -1234 | -2468
(3 rows)

SELECT '' AS five, i.f1, i.f1 * int4 '2' AS x FROM INT2_TBL i;
 five |   f1   |   x    
------+--------+--------
      |      0 |      0
      |   1234 |   2468
      |  -1234 |  -2468
      |  32767 |  65534
      | -32767 | -65534
(5 rows)

SELECT '' AS five, i.f1, i.f1 + int2 '2' AS x FROM INT2_TBL i;
ERROR:  smallint out of range
SELECT '' AS five, i.f1, i.f1 + int2 '2' AS x FROM INT2_TBL i
WHERE f1 < 32766;
 five |   f1   |   x    
------+--------+--------
      |      0 |      2
      |   1234 |   1236
      |  -1234 |  -1232
      | -32767 | -32765
(4 rows)

SELECT '' AS five, i.f1, i.f1 + int4 '2' AS x FROM INT2_TBL i;
 five |   f1   |   x    
------+--------+--------
      |      0 |      2
      |   1234 |   1236
      |  -1234 |  -1232
      |  32767 |  32769
      | -32767 | -32765
(5 rows)

SELECT '' AS five, i.f1, i.f1 - int2 '2' AS x FROM INT2_TBL i;
ERROR:  smallint out of range
SELECT '' AS five, i.f1, i.f1 - int2 '2' AS x FROM INT2_TBL i
WHERE f1 > -32767;
 five |  f1   |   x   
------+-------+-------
      |     0 |    -2
      |  1234 |  1232
      | -1234 | -1236
      | 32767 | 32765
(4 rows)

SELECT '' AS five, i.f1, i.f1 - int4 '2' AS x FROM INT2_TBL i;
 five |   f1   |   x    
------+--------+--------
      |      0 |     -2
      |   1234 |   1232
      |  -1234 |  -1236
      |  32767 |  32765
      | -32767 | -32769
(5 rows)

SELECT '' AS five, i.f1, i.f1 / int2 '2' AS x FROM INT2_TBL i;
 five |   f1   |   x    
------+--------+--------
      |      0 |      0
      |   1234 |    617
      |  -1234 |   -617
      |  32767 |  16383
      | -32767 | -16383
(5 rows)

SELECT '' AS five, i.f1, i.f1 / int4 '2' AS x FROM INT2_TBL i;
 five |   f1   |   x    
------+--------+--------
      |      0 |      0
      |   1234 |    617
      |  -1234 |   -617
      |  32767 |  16383
      | -32767 | -16383
(5 rows)