数据库系统

开发平台：
Unix_Linux

int8.out：源码内容
							QUERY: CREATE TABLE INT8_TBL(q1 int8, q2 int8);
QUERY: INSERT INTO INT8_TBL VALUES('123','456');
QUERY: INSERT INTO INT8_TBL VALUES('123','4567890123456789');
QUERY: INSERT INTO INT8_TBL VALUES('4567890123456789','123');
QUERY: INSERT INTO INT8_TBL VALUES('4567890123456789','4567890123456789');
QUERY: INSERT INTO INT8_TBL VALUES('4567890123456789','-4567890123456789');
QUERY: SELECT * FROM INT8_TBL;
              q1|               q2
----------------+-----------------
             123|              456
             123| 4567890123456789
4567890123456789|              123
4567890123456789| 4567890123456789
4567890123456789|-4567890123456789
(5 rows)
QUERY: SELECT '' AS five, q1 AS plus, -q1 AS minus FROM INT8_TBL;
five|            plus|            minus
----+----------------+-----------------
    |             123|             -123
    |             123|             -123
    |4567890123456789|-4567890123456789
    |4567890123456789|-4567890123456789
    |4567890123456789|-4567890123456789
(5 rows)
QUERY: SELECT '' AS five, q1, q2, q1 + q2 AS plus FROM INT8_TBL;
five|              q1|               q2|            plus
----+----------------+-----------------+----------------
    |             123|              456|             579
    |             123| 4567890123456789|4567890123456912
    |4567890123456789|              123|4567890123456912
    |4567890123456789| 4567890123456789|9135780246913578
    |4567890123456789|-4567890123456789|               0
(5 rows)
QUERY: SELECT '' AS five, q1, q2, q1 - q2 AS minus FROM INT8_TBL;
five|              q1|               q2|            minus
----+----------------+-----------------+-----------------
    |             123|              456|             -333
    |             123| 4567890123456789|-4567890123456666
    |4567890123456789|              123| 4567890123456666
    |4567890123456789| 4567890123456789|                0
    |4567890123456789|-4567890123456789| 9135780246913578
(5 rows)
QUERY: SELECT '' AS three, q1, q2, q1 * q2 AS multiply FROM INT8_TBL
 WHERE q1 < 1000 or (q2 > 0 and q2 < 1000);
three|              q1|              q2|          multiply
-----+----------------+----------------+------------------
     |             123|             456|             56088
     |             123|4567890123456789|561850485185185047
     |4567890123456789|             123|561850485185185047
(3 rows)
QUERY: SELECT '' AS five, q1, q2, q1 / q2 AS divide FROM INT8_TBL;
five|              q1|               q2|        divide
----+----------------+-----------------+--------------
    |             123|              456|             0
    |             123| 4567890123456789|             0
    |4567890123456789|              123|37137318076884
    |4567890123456789| 4567890123456789|             1
    |4567890123456789|-4567890123456789|            -1
(5 rows)
QUERY: SELECT '' AS five, q1, float8(q1) FROM INT8_TBL;
five|              q1|float8              
----+----------------+--------------------
    |             123|123                 
    |             123|123                 
    |4567890123456789|4.56789012345679e+15
    |4567890123456789|4.56789012345679e+15
    |4567890123456789|4.56789012345679e+15
(5 rows)
QUERY: SELECT '' AS five, q2, float8(q2) FROM INT8_TBL;
five|               q2|float8               
----+-----------------+---------------------
    |              456|456                  
    | 4567890123456789|4.56789012345679e+15 
    |              123|123                  
    | 4567890123456789|4.56789012345679e+15 
    |-4567890123456789|-4.56789012345679e+15
(5 rows)
QUERY: SELECT '' AS five, q1, int8(float8(q1)) AS "two coercions" FROM INT8_TBL;
five|              q1|   two coercions
----+----------------+----------------
    |             123|             123
    |             123|             123
    |4567890123456789|4567890123456789
    |4567890123456789|4567890123456789
    |4567890123456789|4567890123456789
(5 rows)
QUERY: SELECT '' AS five, 2 * q1 AS "twice int4" FROM INT8_TBL;
five|      twice int4
----+----------------
    |             246
    |             246
    |9135780246913578
    |9135780246913578
    |9135780246913578
(5 rows)
QUERY: SELECT '' AS five, q1 * 2 AS "twice int4" FROM INT8_TBL;
five|      twice int4
----+----------------
    |             246
    |             246
    |9135780246913578
    |9135780246913578
    |9135780246913578
(5 rows)

						