| 1.2345678901234e-200 | 0
(5 rows)
+SELECT sqrt(float8 '64') AS eight;
+ eight
+-------
+ 8
+(1 row)
+
-- square root
+SELECT |/ float8 '64' AS eight;
+ eight
+-------
+ 8
+(1 row)
+
SELECT '' AS three, f.f1, |/f.f1 AS sqrt_f1
FROM FLOAT8_TBL f
WHERE f.f1 > '0.0';
(3 rows)
-- cube root
+SELECT ||/ float8 '27' AS three;
+ three
+-------
+ 3
+(1 row)
+
SELECT '' AS five, f.f1, ||/f.f1 AS cbrt_f1 FROM FLOAT8_TBL f;
five | f1 | cbrt_f1
------+----------------------+-----------------------
| -1.2345678901234e-200
(5 rows)
--- test for over and under flow
+-- test for over- and underflow
INSERT INTO FLOAT8_TBL(f1) VALUES ('10e400');
ERROR: Input '10e400' is out of range for float8
INSERT INTO FLOAT8_TBL(f1) VALUES ('-10e400');
| 1.2345678901234e-200 | 0
(5 rows)
+SELECT sqrt(float8 '64') AS eight;
+ eight
+-------
+ 8
+(1 row)
+
-- square root
+SELECT |/ float8 '64' AS eight;
+ eight
+-------
+ 8
+(1 row)
+
SELECT '' AS three, f.f1, |/f.f1 AS sqrt_f1
FROM FLOAT8_TBL f
WHERE f.f1 > '0.0';
(3 rows)
-- cube root
+SELECT ||/ float8 '27' AS three;
+ three
+-------
+ 3
+(1 row)
+
SELECT '' AS five, f.f1, ||/f.f1 AS cbrt_f1 FROM FLOAT8_TBL f;
five | f1 | cbrt_f1
------+----------------------+----------------------
| -1.2345678901234e-200
(5 rows)
--- test for over and under flow
+-- test for over- and underflow
INSERT INTO FLOAT8_TBL(f1) VALUES ('10e400');
ERROR: Input '10e400' is out of range for float8
INSERT INTO FLOAT8_TBL(f1) VALUES ('-10e400');