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298 lines
6.4 KiB
Plaintext
298 lines
6.4 KiB
Plaintext
--
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-- INT4
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-- WARNING: int4 operators never check for over/underflow!
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-- Some of these answers are consequently numerically incorrect.
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--
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CREATE TABLE INT4_TBL(f1 int4);
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INSERT INTO INT4_TBL(f1) VALUES ('0');
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INSERT INTO INT4_TBL(f1) VALUES ('123456');
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INSERT INTO INT4_TBL(f1) VALUES ('-123456');
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INSERT INTO INT4_TBL(f1) VALUES ('34.5');
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ERROR: pg_atoi: error in "34.5": can't parse ".5"
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-- largest and smallest values
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INSERT INTO INT4_TBL(f1) VALUES ('2147483647');
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INSERT INTO INT4_TBL(f1) VALUES ('-2147483647');
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-- bad input values -- should give warnings
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INSERT INTO INT4_TBL(f1) VALUES ('1000000000000');
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ERROR: pg_atoi: error reading "1000000000000": Result too large
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INSERT INTO INT4_TBL(f1) VALUES ('asdf');
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ERROR: pg_atoi: error in "asdf": can't parse "asdf"
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SELECT '' AS five, INT4_TBL.*;
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five | f1
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------+-------------
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| 0
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| 123456
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| -123456
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| 2147483647
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| -2147483647
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(5 rows)
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SELECT '' AS four, i.* FROM INT4_TBL i WHERE i.f1 <> int2 '0';
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four | f1
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------+-------------
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| 123456
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| -123456
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| 2147483647
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| -2147483647
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(4 rows)
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SELECT '' AS four, i.* FROM INT4_TBL i WHERE i.f1 <> int4 '0';
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four | f1
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------+-------------
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| 123456
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| -123456
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| 2147483647
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| -2147483647
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(4 rows)
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SELECT '' AS one, i.* FROM INT4_TBL i WHERE i.f1 = int2 '0';
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one | f1
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-----+----
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| 0
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(1 row)
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SELECT '' AS one, i.* FROM INT4_TBL i WHERE i.f1 = int4 '0';
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one | f1
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-----+----
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| 0
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(1 row)
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SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 < int2 '0';
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two | f1
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-----+-------------
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| -123456
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| -2147483647
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(2 rows)
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SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 < int4 '0';
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two | f1
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-----+-------------
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| -123456
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| -2147483647
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(2 rows)
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SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 <= int2 '0';
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three | f1
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-------+-------------
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| 0
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| -123456
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| -2147483647
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(3 rows)
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SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 <= int4 '0';
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three | f1
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-------+-------------
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| 0
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| -123456
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| -2147483647
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(3 rows)
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SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 > int2 '0';
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two | f1
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-----+------------
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| 123456
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| 2147483647
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(2 rows)
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SELECT '' AS two, i.* FROM INT4_TBL i WHERE i.f1 > int4 '0';
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two | f1
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-----+------------
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| 123456
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| 2147483647
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(2 rows)
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SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 >= int2 '0';
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three | f1
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-------+------------
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| 0
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| 123456
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| 2147483647
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(3 rows)
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SELECT '' AS three, i.* FROM INT4_TBL i WHERE i.f1 >= int4 '0';
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three | f1
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-------+------------
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| 0
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| 123456
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| 2147483647
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(3 rows)
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-- positive odds
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SELECT '' AS one, i.* FROM INT4_TBL i WHERE (i.f1 % int2 '2') = int2 '1';
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one | f1
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-----+------------
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| 2147483647
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(1 row)
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-- any evens
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SELECT '' AS three, i.* FROM INT4_TBL i WHERE (i.f1 % int4 '2') = int2 '0';
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three | f1
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-------+---------
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| 0
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| 123456
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| -123456
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(3 rows)
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SELECT '' AS five, i.f1, i.f1 * int2 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+---------
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| 0 | 0
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| 123456 | 246912
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| -123456 | -246912
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| 2147483647 | -2
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| -2147483647 | 2
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(5 rows)
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SELECT '' AS five, i.f1, i.f1 * int4 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+---------
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| 0 | 0
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| 123456 | 246912
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| -123456 | -246912
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| 2147483647 | -2
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| -2147483647 | 2
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(5 rows)
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SELECT '' AS five, i.f1, i.f1 + int2 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+-------------
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| 0 | 2
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| 123456 | 123458
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| -123456 | -123454
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| 2147483647 | -2147483647
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| -2147483647 | -2147483645
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(5 rows)
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SELECT '' AS five, i.f1, i.f1 + int4 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+-------------
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| 0 | 2
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| 123456 | 123458
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| -123456 | -123454
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| 2147483647 | -2147483647
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| -2147483647 | -2147483645
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(5 rows)
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SELECT '' AS five, i.f1, i.f1 - int2 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+------------
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| 0 | -2
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| 123456 | 123454
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| -123456 | -123458
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| 2147483647 | 2147483645
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| -2147483647 | 2147483647
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(5 rows)
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SELECT '' AS five, i.f1, i.f1 - int4 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+------------
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| 0 | -2
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| 123456 | 123454
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| -123456 | -123458
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| 2147483647 | 2147483645
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| -2147483647 | 2147483647
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(5 rows)
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SELECT '' AS five, i.f1, i.f1 / int2 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+-------------
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| 0 | 0
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| 123456 | 61728
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| -123456 | -61728
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| 2147483647 | 1073741823
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| -2147483647 | -1073741823
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(5 rows)
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SELECT '' AS five, i.f1, i.f1 / int4 '2' AS x FROM INT4_TBL i;
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five | f1 | x
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------+-------------+-------------
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| 0 | 0
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| 123456 | 61728
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| -123456 | -61728
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| 2147483647 | 1073741823
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| -2147483647 | -1073741823
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(5 rows)
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--
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-- more complex expressions
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--
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-- variations on unary minus parsing
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SELECT -2+3 AS one;
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one
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-----
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1
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(1 row)
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SELECT 4-2 AS two;
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two
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-----
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2
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(1 row)
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SELECT 2- -1 AS three;
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three
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-------
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3
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(1 row)
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SELECT 2 - -2 AS four;
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four
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------
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4
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(1 row)
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SELECT int2 '2' * int2 '2' = int2 '16' / int2 '4' AS true;
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true
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------
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t
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(1 row)
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SELECT int4 '2' * int2 '2' = int2 '16' / int4 '4' AS true;
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true
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------
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t
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(1 row)
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SELECT int2 '2' * int4 '2' = int4 '16' / int2 '4' AS true;
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true
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------
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t
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(1 row)
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SELECT int4 '1000' < int4 '999' AS false;
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false
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-------
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f
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(1 row)
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SELECT 4! AS twenty_four;
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twenty_four
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-------------
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24
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(1 row)
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SELECT !!3 AS six;
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six
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-----
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6
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(1 row)
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SELECT 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 AS ten;
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ten
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-----
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10
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(1 row)
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SELECT 2 + 2 / 2 AS three;
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three
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-------
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3
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(1 row)
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SELECT (2 + 2) / 2 AS two;
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two
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-----
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2
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(1 row)
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