mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-18 20:36:58 +08:00
fc7fd50182
Regression tests and documentation have both been updated. SQL2003 requires that both ceiling() and ceil() be present, so I have documented both spellings. SQL2003 doesn't mention pow() as far as I can see, so I decided to replace pow() with power() in the documentation: there is little reason to encourage the continued usage of a function that isn't compliant with the standard, given a standard-compliant alternative. RELEASE NOTES: should state that pow() is considered deprecated (although I don't see the need to ever remove it.)
167 lines
4.1 KiB
SQL
167 lines
4.1 KiB
SQL
--
|
|
-- FLOAT8
|
|
--
|
|
|
|
CREATE TABLE FLOAT8_TBL(f1 float8);
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES (' 0.0 ');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('1004.30 ');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES (' -34.84');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('1.2345678901234e+200');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('1.2345678901234e-200');
|
|
|
|
-- test for underflow and overflow handling
|
|
SELECT '10e400'::float8;
|
|
SELECT '-10e400'::float8;
|
|
SELECT '10e-400'::float8;
|
|
SELECT '-10e-400'::float8;
|
|
|
|
-- bad input
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES (' ');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('xyz');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('5.0.0');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('5 . 0');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('5. 0');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES (' - 3');
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('123 5');
|
|
|
|
-- special inputs
|
|
SELECT 'NaN'::float8;
|
|
SELECT 'nan'::float8;
|
|
SELECT ' NAN '::float8;
|
|
SELECT 'infinity'::float8;
|
|
SELECT ' -INFINiTY '::float8;
|
|
-- bad special inputs
|
|
SELECT 'N A N'::float8;
|
|
SELECT 'NaN x'::float8;
|
|
SELECT ' INFINITY x'::float8;
|
|
|
|
SELECT 'Infinity'::float8 + 100.0;
|
|
SELECT 'Infinity'::float8 / 'Infinity'::float8;
|
|
SELECT 'nan'::float8 / 'nan'::float8;
|
|
|
|
SELECT '' AS five, FLOAT8_TBL.*;
|
|
|
|
SELECT '' AS four, f.* FROM FLOAT8_TBL f WHERE f.f1 <> '1004.3';
|
|
|
|
SELECT '' AS one, f.* FROM FLOAT8_TBL f WHERE f.f1 = '1004.3';
|
|
|
|
SELECT '' AS three, f.* FROM FLOAT8_TBL f WHERE '1004.3' > f.f1;
|
|
|
|
SELECT '' AS three, f.* FROM FLOAT8_TBL f WHERE f.f1 < '1004.3';
|
|
|
|
SELECT '' AS four, f.* FROM FLOAT8_TBL f WHERE '1004.3' >= f.f1;
|
|
|
|
SELECT '' AS four, f.* FROM FLOAT8_TBL f WHERE f.f1 <= '1004.3';
|
|
|
|
SELECT '' AS three, f.f1, f.f1 * '-10' AS x
|
|
FROM FLOAT8_TBL f
|
|
WHERE f.f1 > '0.0';
|
|
|
|
SELECT '' AS three, f.f1, f.f1 + '-10' AS x
|
|
FROM FLOAT8_TBL f
|
|
WHERE f.f1 > '0.0';
|
|
|
|
SELECT '' AS three, f.f1, f.f1 / '-10' AS x
|
|
FROM FLOAT8_TBL f
|
|
WHERE f.f1 > '0.0';
|
|
|
|
SELECT '' AS three, f.f1, f.f1 - '-10' AS x
|
|
FROM FLOAT8_TBL f
|
|
WHERE f.f1 > '0.0';
|
|
|
|
SELECT '' AS one, f.f1 ^ '2.0' AS square_f1
|
|
FROM FLOAT8_TBL f where f.f1 = '1004.3';
|
|
|
|
-- absolute value
|
|
SELECT '' AS five, f.f1, @f.f1 AS abs_f1
|
|
FROM FLOAT8_TBL f;
|
|
|
|
-- truncate
|
|
SELECT '' AS five, f.f1, %f.f1 AS trunc_f1
|
|
FROM FLOAT8_TBL f;
|
|
|
|
-- round
|
|
SELECT '' AS five, f.f1, f.f1 % AS round_f1
|
|
FROM FLOAT8_TBL f;
|
|
|
|
-- ceil / ceiling
|
|
select ceil(f1) as ceil_f1 from float8_tbl f;
|
|
select ceiling(f1) as ceiling_f1 from float8_tbl f;
|
|
|
|
-- floor
|
|
select floor(f1) as floor_f1 from float8_tbl f;
|
|
|
|
-- sign
|
|
select sign(f1) as sign_f1 from float8_tbl f;
|
|
|
|
-- square root
|
|
SELECT sqrt(float8 '64') AS eight;
|
|
|
|
SELECT |/ float8 '64' AS eight;
|
|
|
|
SELECT '' AS three, f.f1, |/f.f1 AS sqrt_f1
|
|
FROM FLOAT8_TBL f
|
|
WHERE f.f1 > '0.0';
|
|
|
|
-- power
|
|
SELECT power(float8 '144', float8 '0.5');
|
|
|
|
-- take exp of ln(f.f1)
|
|
SELECT '' AS three, f.f1, exp(ln(f.f1)) AS exp_ln_f1
|
|
FROM FLOAT8_TBL f
|
|
WHERE f.f1 > '0.0';
|
|
|
|
-- cube root
|
|
SELECT ||/ float8 '27' AS three;
|
|
|
|
SELECT '' AS five, f.f1, ||/f.f1 AS cbrt_f1 FROM FLOAT8_TBL f;
|
|
|
|
|
|
SELECT '' AS five, FLOAT8_TBL.*;
|
|
|
|
UPDATE FLOAT8_TBL
|
|
SET f1 = FLOAT8_TBL.f1 * '-1'
|
|
WHERE FLOAT8_TBL.f1 > '0.0';
|
|
|
|
SELECT '' AS bad, f.f1 * '1e200' from FLOAT8_TBL f;
|
|
|
|
SELECT '' AS bad, f.f1 ^ '1e200' from FLOAT8_TBL f;
|
|
|
|
SELECT '' AS bad, ln(f.f1) from FLOAT8_TBL f where f.f1 = '0.0' ;
|
|
|
|
SELECT '' AS bad, ln(f.f1) from FLOAT8_TBL f where f.f1 < '0.0' ;
|
|
|
|
SELECT '' AS bad, exp(f.f1) from FLOAT8_TBL f;
|
|
|
|
SELECT '' AS bad, f.f1 / '0.0' from FLOAT8_TBL f;
|
|
|
|
SELECT '' AS five, FLOAT8_TBL.*;
|
|
|
|
-- test for over- and underflow
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('10e400');
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('-10e400');
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('10e-400');
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('-10e-400');
|
|
|
|
-- maintain external table consistency across platforms
|
|
-- delete all values and reinsert well-behaved ones
|
|
|
|
DELETE FROM FLOAT8_TBL;
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('0.0');
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('-34.84');
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('-1004.30');
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('-1.2345678901234e+200');
|
|
|
|
INSERT INTO FLOAT8_TBL(f1) VALUES ('-1.2345678901234e-200');
|
|
|
|
SELECT '' AS five, FLOAT8_TBL.*;
|
|
|