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MySQL Problem with large numbers
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I'm trying to put together a function to convert a size from one type to another (e.g. bytes >> gigabytes).
An extract is below
DROP FUNCTION fc_convSize;
DELIMITER $$
CREATE FUNCTION `fc_convSize`(inVal BIGINT)
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
-- bytes 2 exabytes
SET @inVal := inVal/1024/1024/1024/1024/1024/1024;
RETURN @outVal;
END$$
DELIMITER ;
But it doesn't work with large numbers. e.g.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT fc_convSize(@input1);
ERROR 1264 (22003): Out of range value for column 'inVal' at row 1
But from what I can tell, max_binlog_cache_size is 184467440737095*47520* and the maximum for a BIGINT is 184467440737095*51615* so it should fit, right?
But it gets stranger.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input1/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input1/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SET @input2 := (18446744073709547520);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input2/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input2/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SELECT 18446744073709547520/1024/1024/1024/1024/1024/1024;
+----------------------------------------------------+
| 18446744073709547520/1024/1024/1024/1024/1024/1024 |
+----------------------------------------------------+
| 15.999999999999996447286321 |
+----------------------------------------------------+
1 row in set (0.00 sec)
What's going on???
mysql
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
bumped to the homepage by Community♦ 5 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I'm trying to put together a function to convert a size from one type to another (e.g. bytes >> gigabytes).
An extract is below
DROP FUNCTION fc_convSize;
DELIMITER $$
CREATE FUNCTION `fc_convSize`(inVal BIGINT)
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
-- bytes 2 exabytes
SET @inVal := inVal/1024/1024/1024/1024/1024/1024;
RETURN @outVal;
END$$
DELIMITER ;
But it doesn't work with large numbers. e.g.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT fc_convSize(@input1);
ERROR 1264 (22003): Out of range value for column 'inVal' at row 1
But from what I can tell, max_binlog_cache_size is 184467440737095*47520* and the maximum for a BIGINT is 184467440737095*51615* so it should fit, right?
But it gets stranger.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input1/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input1/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SET @input2 := (18446744073709547520);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input2/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input2/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SELECT 18446744073709547520/1024/1024/1024/1024/1024/1024;
+----------------------------------------------------+
| 18446744073709547520/1024/1024/1024/1024/1024/1024 |
+----------------------------------------------------+
| 15.999999999999996447286321 |
+----------------------------------------------------+
1 row in set (0.00 sec)
What's going on???
mysql
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
bumped to the homepage by Community♦ 5 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I'm trying to put together a function to convert a size from one type to another (e.g. bytes >> gigabytes).
An extract is below
DROP FUNCTION fc_convSize;
DELIMITER $$
CREATE FUNCTION `fc_convSize`(inVal BIGINT)
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
-- bytes 2 exabytes
SET @inVal := inVal/1024/1024/1024/1024/1024/1024;
RETURN @outVal;
END$$
DELIMITER ;
But it doesn't work with large numbers. e.g.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT fc_convSize(@input1);
ERROR 1264 (22003): Out of range value for column 'inVal' at row 1
But from what I can tell, max_binlog_cache_size is 184467440737095*47520* and the maximum for a BIGINT is 184467440737095*51615* so it should fit, right?
But it gets stranger.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input1/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input1/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SET @input2 := (18446744073709547520);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input2/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input2/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SELECT 18446744073709547520/1024/1024/1024/1024/1024/1024;
+----------------------------------------------------+
| 18446744073709547520/1024/1024/1024/1024/1024/1024 |
+----------------------------------------------------+
| 15.999999999999996447286321 |
+----------------------------------------------------+
1 row in set (0.00 sec)
What's going on???
mysql
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
I'm trying to put together a function to convert a size from one type to another (e.g. bytes >> gigabytes).
An extract is below
DROP FUNCTION fc_convSize;
DELIMITER $$
CREATE FUNCTION `fc_convSize`(inVal BIGINT)
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
-- bytes 2 exabytes
SET @inVal := inVal/1024/1024/1024/1024/1024/1024;
RETURN @outVal;
END$$
DELIMITER ;
But it doesn't work with large numbers. e.g.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT fc_convSize(@input1);
ERROR 1264 (22003): Out of range value for column 'inVal' at row 1
But from what I can tell, max_binlog_cache_size is 184467440737095*47520* and the maximum for a BIGINT is 184467440737095*51615* so it should fit, right?
But it gets stranger.
mysql> SET @input1 := (SELECT @@global.max_binlog_cache_size);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input1/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input1/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SET @input2 := (18446744073709547520);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @input2/1024/1024/1024/1024/1024/1024;
+---------------------------------------+
| @input2/1024/1024/1024/1024/1024/1024 |
+---------------------------------------+
| -0.000000000000003552713679 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql> SELECT 18446744073709547520/1024/1024/1024/1024/1024/1024;
+----------------------------------------------------+
| 18446744073709547520/1024/1024/1024/1024/1024/1024 |
+----------------------------------------------------+
| 15.999999999999996447286321 |
+----------------------------------------------------+
1 row in set (0.00 sec)
What's going on???
mysql
mysql
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
asked Sep 2 '16 at 13:34
IGGtIGGt
9971027
9971027
bumped to the homepage by Community♦ 5 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 5 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Do you have to declare the argument as a bigint?
CREATE OR REPLACE FUNCTION fc_convSize(inVal decimal(40,0))
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
return inVal/1024/1024/1024/1024/1024/1024;
END$$
select fc_convSize(18446744073709547520000000123333232323);
+-----------------------------------------------------+
| fc_convSize(18446744073709547520000000123333232323) |
+-----------------------------------------------------+
| 15999999999999996447.29 |
+-----------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
However:
select fc_convSize(10000*18446744073709547520);
ERROR 1690 (22003): BIGINT UNSIGNED value is out of range in '(10000 * 18446744073709547520)'
MySQL tries to fit the result of the multiplication in a bigint which fails. You can cast one of the arguments to void this:
select fc_convSize(10000*cast(18446744073709547520 as decimal(40,0)));
+----------------------------------------------------------------+
| fc_convSize(10000*cast(18446744073709547520 as decimal(40,0))) |
+----------------------------------------------------------------+
| 160000.00 |
+----------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
Note that I just grabbed decimal(40,0) out of thin air, just pick something that is large enough for your needs.
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
add a comment |
Bytes to gigabytes on only 3 divides:
/1024/1024/1024
A simpler (and faster) way to do this
SET @input1 := (SELECT @@global.max_binlog_cache_size);
is
SELECT @input1 := @@global.max_binlog_cache_size;
The problem with SET @input2 := (18446744073709547520); is that the number is bigger than can fit in a BIGINT SIGNED. So it (somewhat erroneously) stores the 64 bits blindly; this turns into a negative number.
Consider CAST:
SELECT CAST(@@global.max_binlog_cache_size AS UNSIGNED)/1024/1024/1024;
--> 17179869183.999996185303
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
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active
oldest
votes
Do you have to declare the argument as a bigint?
CREATE OR REPLACE FUNCTION fc_convSize(inVal decimal(40,0))
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
return inVal/1024/1024/1024/1024/1024/1024;
END$$
select fc_convSize(18446744073709547520000000123333232323);
+-----------------------------------------------------+
| fc_convSize(18446744073709547520000000123333232323) |
+-----------------------------------------------------+
| 15999999999999996447.29 |
+-----------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
However:
select fc_convSize(10000*18446744073709547520);
ERROR 1690 (22003): BIGINT UNSIGNED value is out of range in '(10000 * 18446744073709547520)'
MySQL tries to fit the result of the multiplication in a bigint which fails. You can cast one of the arguments to void this:
select fc_convSize(10000*cast(18446744073709547520 as decimal(40,0)));
+----------------------------------------------------------------+
| fc_convSize(10000*cast(18446744073709547520 as decimal(40,0))) |
+----------------------------------------------------------------+
| 160000.00 |
+----------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
Note that I just grabbed decimal(40,0) out of thin air, just pick something that is large enough for your needs.
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
add a comment |
Do you have to declare the argument as a bigint?
CREATE OR REPLACE FUNCTION fc_convSize(inVal decimal(40,0))
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
return inVal/1024/1024/1024/1024/1024/1024;
END$$
select fc_convSize(18446744073709547520000000123333232323);
+-----------------------------------------------------+
| fc_convSize(18446744073709547520000000123333232323) |
+-----------------------------------------------------+
| 15999999999999996447.29 |
+-----------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
However:
select fc_convSize(10000*18446744073709547520);
ERROR 1690 (22003): BIGINT UNSIGNED value is out of range in '(10000 * 18446744073709547520)'
MySQL tries to fit the result of the multiplication in a bigint which fails. You can cast one of the arguments to void this:
select fc_convSize(10000*cast(18446744073709547520 as decimal(40,0)));
+----------------------------------------------------------------+
| fc_convSize(10000*cast(18446744073709547520 as decimal(40,0))) |
+----------------------------------------------------------------+
| 160000.00 |
+----------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
Note that I just grabbed decimal(40,0) out of thin air, just pick something that is large enough for your needs.
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
add a comment |
Do you have to declare the argument as a bigint?
CREATE OR REPLACE FUNCTION fc_convSize(inVal decimal(40,0))
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
return inVal/1024/1024/1024/1024/1024/1024;
END$$
select fc_convSize(18446744073709547520000000123333232323);
+-----------------------------------------------------+
| fc_convSize(18446744073709547520000000123333232323) |
+-----------------------------------------------------+
| 15999999999999996447.29 |
+-----------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
However:
select fc_convSize(10000*18446744073709547520);
ERROR 1690 (22003): BIGINT UNSIGNED value is out of range in '(10000 * 18446744073709547520)'
MySQL tries to fit the result of the multiplication in a bigint which fails. You can cast one of the arguments to void this:
select fc_convSize(10000*cast(18446744073709547520 as decimal(40,0)));
+----------------------------------------------------------------+
| fc_convSize(10000*cast(18446744073709547520 as decimal(40,0))) |
+----------------------------------------------------------------+
| 160000.00 |
+----------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
Note that I just grabbed decimal(40,0) out of thin air, just pick something that is large enough for your needs.
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
Do you have to declare the argument as a bigint?
CREATE OR REPLACE FUNCTION fc_convSize(inVal decimal(40,0))
RETURNS DECIMAL(25,2)
NO SQL
BEGIN
return inVal/1024/1024/1024/1024/1024/1024;
END$$
select fc_convSize(18446744073709547520000000123333232323);
+-----------------------------------------------------+
| fc_convSize(18446744073709547520000000123333232323) |
+-----------------------------------------------------+
| 15999999999999996447.29 |
+-----------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
However:
select fc_convSize(10000*18446744073709547520);
ERROR 1690 (22003): BIGINT UNSIGNED value is out of range in '(10000 * 18446744073709547520)'
MySQL tries to fit the result of the multiplication in a bigint which fails. You can cast one of the arguments to void this:
select fc_convSize(10000*cast(18446744073709547520 as decimal(40,0)));
+----------------------------------------------------------------+
| fc_convSize(10000*cast(18446744073709547520 as decimal(40,0))) |
+----------------------------------------------------------------+
| 160000.00 |
+----------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
Note that I just grabbed decimal(40,0) out of thin air, just pick something that is large enough for your needs.
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
edited Sep 2 '16 at 15:00
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
answered Sep 2 '16 at 14:47
LennartLennart
13.3k21243
13.3k21243
add a comment |
add a comment |
Bytes to gigabytes on only 3 divides:
/1024/1024/1024
A simpler (and faster) way to do this
SET @input1 := (SELECT @@global.max_binlog_cache_size);
is
SELECT @input1 := @@global.max_binlog_cache_size;
The problem with SET @input2 := (18446744073709547520); is that the number is bigger than can fit in a BIGINT SIGNED. So it (somewhat erroneously) stores the 64 bits blindly; this turns into a negative number.
Consider CAST:
SELECT CAST(@@global.max_binlog_cache_size AS UNSIGNED)/1024/1024/1024;
--> 17179869183.999996185303
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
add a comment |
Bytes to gigabytes on only 3 divides:
/1024/1024/1024
A simpler (and faster) way to do this
SET @input1 := (SELECT @@global.max_binlog_cache_size);
is
SELECT @input1 := @@global.max_binlog_cache_size;
The problem with SET @input2 := (18446744073709547520); is that the number is bigger than can fit in a BIGINT SIGNED. So it (somewhat erroneously) stores the 64 bits blindly; this turns into a negative number.
Consider CAST:
SELECT CAST(@@global.max_binlog_cache_size AS UNSIGNED)/1024/1024/1024;
--> 17179869183.999996185303
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
add a comment |
Bytes to gigabytes on only 3 divides:
/1024/1024/1024
A simpler (and faster) way to do this
SET @input1 := (SELECT @@global.max_binlog_cache_size);
is
SELECT @input1 := @@global.max_binlog_cache_size;
The problem with SET @input2 := (18446744073709547520); is that the number is bigger than can fit in a BIGINT SIGNED. So it (somewhat erroneously) stores the 64 bits blindly; this turns into a negative number.
Consider CAST:
SELECT CAST(@@global.max_binlog_cache_size AS UNSIGNED)/1024/1024/1024;
--> 17179869183.999996185303
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
Bytes to gigabytes on only 3 divides:
/1024/1024/1024
A simpler (and faster) way to do this
SET @input1 := (SELECT @@global.max_binlog_cache_size);
is
SELECT @input1 := @@global.max_binlog_cache_size;
The problem with SET @input2 := (18446744073709547520); is that the number is bigger than can fit in a BIGINT SIGNED. So it (somewhat erroneously) stores the 64 bits blindly; this turns into a negative number.
Consider CAST:
SELECT CAST(@@global.max_binlog_cache_size AS UNSIGNED)/1024/1024/1024;
--> 17179869183.999996185303
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
answered Sep 3 '16 at 1:33
Rick JamesRick James
43.6k22259
43.6k22259
add a comment |
add a comment |
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