float4.out

关系型数据库 Postgresql 6.5.2

QUERY: CREATE TABLE FLOAT4_TBL (f1  float4);
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('0.0');
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('1004.30');
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('-34.84');
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('1.2345678901234e+20');
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('1.2345678901234e-20');
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('10e40');
ERROR:  Bad float4 input format -- overflow
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('-10e40');
ERROR:  Bad float4 input format -- overflow
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('10e-40');
ERROR:  Bad float4 input format -- underflow
QUERY: INSERT INTO FLOAT4_TBL(f1) VALUES ('-10e-40');
ERROR:  Bad float4 input format -- underflow
QUERY: SELECT '' AS five, FLOAT4_TBL.*;
five|f1         
----+-----------
    |0          
    |1004.3     
    |-34.84     
    |1.23457e+20
    |1.23457e-20
(5 rows)

QUERY: SELECT '' AS four, f.* FROM FLOAT4_TBL f WHERE f.f1 <> '1004.3';
four|f1         
----+-----------
    |0          
    |-34.84     
    |1.23457e+20
    |1.23457e-20
(4 rows)

QUERY: SELECT '' AS one, f.* FROM FLOAT4_TBL f WHERE f.f1 = '1004.3';
one|    f1
---+------
   |1004.3
(1 row)

QUERY: SELECT '' AS three, f.* FROM FLOAT4_TBL f WHERE '1004.3' > f.f1;
three|         f1
-----+-----------
     |          0
     |     -34.84
     |1.23457e-20
(3 rows)

QUERY: SELECT '' AS three, f.* FROM FLOAT4_TBL f WHERE  f.f1 < '1004.3';
three|         f1
-----+-----------
     |          0
     |     -34.84
     |1.23457e-20
(3 rows)

QUERY: SELECT '' AS four, f.* FROM FLOAT4_TBL f WHERE '1004.3' >= f.f1;
four|         f1
----+-----------
    |          0
    |     1004.3
    |     -34.84
    |1.23457e-20
(4 rows)

QUERY: SELECT '' AS four, f.* FROM FLOAT4_TBL f WHERE  f.f1 <= '1004.3';
four|         f1
----+-----------
    |          0
    |     1004.3
    |     -34.84
    |1.23457e-20
(4 rows)

QUERY: SELECT '' AS three, f.f1, f.f1 * '-10' AS x FROM FLOAT4_TBL f
   WHERE f.f1 > '0.0';
three|f1         |x           
-----+-----------+------------
     |1004.3     |-10043      
     |1.23457e+20|-1.23457e+21
     |1.23457e-20|-1.23457e-19
(3 rows)

QUERY: SELECT '' AS three, f.f1, f.f1 + '-10' AS x FROM FLOAT4_TBL f
   WHERE f.f1 > '0.0';
three|f1         |x          
-----+-----------+-----------
     |1004.3     |994.3      
     |1.23457e+20|1.23457e+20
     |1.23457e-20|-10        
(3 rows)

QUERY: SELECT '' AS three, f.f1, f.f1 / '-10' AS x FROM FLOAT4_TBL f
   WHERE f.f1 > '0.0';
three|f1         |x           
-----+-----------+------------
     |1004.3     |-100.43     
     |1.23457e+20|-1.23457e+19
     |1.23457e-20|-1.23457e-21
(3 rows)

QUERY: SELECT '' AS three, f.f1, f.f1 - '-10' AS x FROM FLOAT4_TBL f
   WHERE f.f1 > '0.0';
three|f1         |x          
-----+-----------+-----------
     |1004.3     |1014.3     
     |1.23457e+20|1.23457e+20
     |1.23457e-20|10         
(3 rows)

QUERY: SELECT '' AS bad, f.f1 / '0.0' from FLOAT4_TBL f;
ERROR:  float4div: divide by zero error
QUERY: SELECT '' AS five, FLOAT4_TBL.*;
five|f1         
----+-----------
    |0          
    |1004.3     
    |-34.84     
    |1.23457e+20
    |1.23457e-20
(5 rows)

QUERY: SELECT '' AS five, f.f1, @f.f1 AS abs_f1 FROM FLOAT4_TBL f;
five|f1         |abs_f1     
----+-----------+-----------
    |0          |0          
    |1004.3     |1004.3     
    |-34.84     |34.84      
    |1.23457e+20|1.23457e+20
    |1.23457e-20|1.23457e-20
(5 rows)

QUERY: UPDATE FLOAT4_TBL
   SET f1 = FLOAT4_TBL.f1 * '-1'
   WHERE FLOAT4_TBL.f1 > '0.0';
QUERY: SELECT '' AS five, FLOAT4_TBL.*;
five|f1          
----+------------
    |0           
    |-34.84      
    |-1004.3     
    |-1.23457e+20
    |-1.23457e-20
(5 rows)