mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-20 13:27:00 +08:00
bab3d29fba
specifically ceil(), floor(), and sign(). There may be other functions that need to be added, but this is a start. I've included some simple regression tests. Neil Conway
138 lines
3.1 KiB
SQL
138 lines
3.1 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');
|
|
|
|
|
|
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
|
|
select ceil(f1) as ceil_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';
|
|
|
|
-- 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.*;
|
|
|