I need insert in the table tbl_range of my MySQL database this decimal value:
1866752.0
And I set field 'range' in the table tbl_range:
CREATE TABLE `tbl_range` (
`Range` decimal(10,5) DEFAULT NULL,
`id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
But in the query insert I've this error:
[Err] 1264 - Out of range value for column 'Range' at row 1
You have to change:
Range decimal(10,5) DEFAULT NULL,
to
Range decimal(15,5) DEFAULT NULL,
because 1st parameter indicates total number of digits including decimal values. So if you are putting (10,5) then you can insert upto 99999.99999. But your required value is greater than that.
DECIMAL(X,Y): X = Number of total digits. Y = Number of digits after the decimal point.
Since you declare it DECIMAL(10,5) your maximum number is 99999.99999, a bit smaller than the number you're trying to insert.
Increase the first number a bit, depending on how big numbers you want to be able to handle in your table, or perhaps decrease the second one. Do you really need 5 digits after the decimal point?
Related
I have to develop a application using MySQL and I have to save values like "1412792828893" which represent a timestamp but with a precision of a millisecond. That is, the amount of milliseconds since 1.1.1970. I declare the row as timestamp but unfortunately this didn't work. All values are set to 0000-00-00 00:00:00
CREATE TABLE IF NOT EXISTS `probability` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`segment_id` int(11) NOT NULL,
`probability` float NOT NULL,
`measured_at` timestamp NOT NULL,
`provider_id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ;
How should be the declaration in order to be able to save timestamp values with this precision?
You need to be at MySQL version 5.6.4 or later to declare columns with fractional-second time datatypes. Not sure you have the right version? Try SELECT NOW(3). If you get an error, you don't have the right version.
For example, DATETIME(3) will give you millisecond resolution in your timestamps, and TIMESTAMP(6) will give you microsecond resolution on a *nix-style timestamp.
Read this: https://dev.mysql.com/doc/refman/8.0/en/fractional-seconds.html
NOW(3) will give you the present time from your MySQL server's operating system with millisecond precision.
If you have a number of milliseconds since the Unix epoch, try this to get a DATETIME(3) value
FROM_UNIXTIME(ms * 0.001)
Javascript timestamps, for example, are represented in milliseconds since the Unix epoch.
(Notice that MySQL internal fractional arithmetic, like * 0.001, is always handled as IEEE754 double precision floating point, so it's unlikely you'll lose precision before the Sun becomes a white dwarf star.)
If you're using an older version of MySQL and you need subsecond time precision, your best path is to upgrade. Anything else will force you into doing messy workarounds.
If, for some reason you can't upgrade, you could consider using BIGINT or DOUBLE columns to store Javascript timestamps as if they were numbers. FROM_UNIXTIME(col * 0.001) will still work OK. If you need the current time to store in such a column, you could use UNIX_TIMESTAMP() * 1000
CREATE TABLE fractest( c1 TIME(3), c2 DATETIME(3), c3 TIMESTAMP(3) );
INSERT INTO fractest VALUES
('17:51:04.777', '2018-09-08 17:51:04.777', '2018-09-08 17:51:04.777');
please create the table like this by mentioning the length (length can be whatever digit count that you want by milliseconds) of timestamp timestamp(2) or timestamp(3) or timestamp(5) likewise. the Mysql version should be 5.6 or above.
https://dev.mysql.com/doc/refman/5.6/en/fractional-seconds.html
CREATE TABLE IF NOT EXISTS `probability` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`measured_at` timestamp(2) NOT NULL,
PRIMARY KEY (`id`)
) ;
and then pass the timestamp through Java.
statement.setTimestamp(2, new Timestamp(new Date().getTime()))
You can use BIGINT as follows:
CREATE TABLE user_reg (
user_id INT NOT NULL AUTO_INCREMENT,
identifier INT,
phone_number CHAR(11) NOT NULL,
verified TINYINT UNSIGNED NOT NULL,
reg_time BIGINT,
last_active_time BIGINT,
PRIMARY KEY (user_id),
INDEX (phone_number, user_id, identifier)
);
Currently the balance_amount column in MySQL is using double type, and it contains values such as 11.28839999999999.
I want to round such values to 2 decimal places to become 11.29, and I want to run a mass update to all the other 80 tables in the system so that it will show 2 decimal places only. After which, I want to change it from double to decimal (10,2) type.
CREATE TABLE IF NOT EXISTS `account` (
`account_id` varchar(15) NOT NULL,
`description` varchar(100) DEFAULT NULL,
`balance_amount` double DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
So how can I achieve it?
You can round the corresponding columns in each table to 2 decimal places using:
Update <table-name> SET <column-name> = ROUND(<column-name>, 2);
Then alter the corresponding column in each table to be a DECIMAL(10, 2):
ALTER TABLE `<table-name>` CHANGE COLUMN `<column-name>` `<column-name>` DECIMAL(10,2) NULL DEFAULT NULL ;
But this is something you should be doing in your maintenance window, not live hours and you should backup your database as a disaster management measure before doing this.
I have to develop a application using MySQL and I have to save values like "1412792828893" which represent a timestamp but with a precision of a millisecond. That is, the amount of milliseconds since 1.1.1970. I declare the row as timestamp but unfortunately this didn't work. All values are set to 0000-00-00 00:00:00
CREATE TABLE IF NOT EXISTS `probability` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`segment_id` int(11) NOT NULL,
`probability` float NOT NULL,
`measured_at` timestamp NOT NULL,
`provider_id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ;
How should be the declaration in order to be able to save timestamp values with this precision?
You need to be at MySQL version 5.6.4 or later to declare columns with fractional-second time datatypes. Not sure you have the right version? Try SELECT NOW(3). If you get an error, you don't have the right version.
For example, DATETIME(3) will give you millisecond resolution in your timestamps, and TIMESTAMP(6) will give you microsecond resolution on a *nix-style timestamp.
Read this: https://dev.mysql.com/doc/refman/8.0/en/fractional-seconds.html
NOW(3) will give you the present time from your MySQL server's operating system with millisecond precision.
If you have a number of milliseconds since the Unix epoch, try this to get a DATETIME(3) value
FROM_UNIXTIME(ms * 0.001)
Javascript timestamps, for example, are represented in milliseconds since the Unix epoch.
(Notice that MySQL internal fractional arithmetic, like * 0.001, is always handled as IEEE754 double precision floating point, so it's unlikely you'll lose precision before the Sun becomes a white dwarf star.)
If you're using an older version of MySQL and you need subsecond time precision, your best path is to upgrade. Anything else will force you into doing messy workarounds.
If, for some reason you can't upgrade, you could consider using BIGINT or DOUBLE columns to store Javascript timestamps as if they were numbers. FROM_UNIXTIME(col * 0.001) will still work OK. If you need the current time to store in such a column, you could use UNIX_TIMESTAMP() * 1000
CREATE TABLE fractest( c1 TIME(3), c2 DATETIME(3), c3 TIMESTAMP(3) );
INSERT INTO fractest VALUES
('17:51:04.777', '2018-09-08 17:51:04.777', '2018-09-08 17:51:04.777');
please create the table like this by mentioning the length (length can be whatever digit count that you want by milliseconds) of timestamp timestamp(2) or timestamp(3) or timestamp(5) likewise. the Mysql version should be 5.6 or above.
https://dev.mysql.com/doc/refman/5.6/en/fractional-seconds.html
CREATE TABLE IF NOT EXISTS `probability` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`measured_at` timestamp(2) NOT NULL,
PRIMARY KEY (`id`)
) ;
and then pass the timestamp through Java.
statement.setTimestamp(2, new Timestamp(new Date().getTime()))
You can use BIGINT as follows:
CREATE TABLE user_reg (
user_id INT NOT NULL AUTO_INCREMENT,
identifier INT,
phone_number CHAR(11) NOT NULL,
verified TINYINT UNSIGNED NOT NULL,
reg_time BIGINT,
last_active_time BIGINT,
PRIMARY KEY (user_id),
INDEX (phone_number, user_id, identifier)
);
CREATE TABLE IF NOT EXISTS `test` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`country` varchar(5) NOT NULL,
`state` char(5) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
I tried following query to insert data
INSERT INTO `test`.`test` (`id` ,`country` ,`state`)
VALUES (NULL , 'south-india', 'Gujarat');
When I execute above query It will shows following warning
Warning: #1265 Data truncated for column 'country' at row 1
Warning: #1265 Data truncated for column 'state' at row 1
I found Reference that VARCHAR is variable-length.CHAR is fixed length.
Then what you mean by
VARCHAR is variable-length.
CHAR is fixed length.
VARCHAR(5) will use at most 5 characters of storage, while CHAR(5) will always use exactly 5.
For a field holding a person's name, for example, you'd want to use a VARCHAR, because while on average someone's name is usually short, you still want to cope with the few people with very long names, without having to have that space wasted for the majority of your database rows.
As you said varchar is variable-length and char is fixed. But the main difference is the byte it uses.
Example.
column: username
type: char(10)
if you have data on column username which is 'test', it will use 10 bytes. and it will have space.
'test______'
Hence the varchar column will only uses the byte you use. for 'test' it will only use 4 bytes. and your data will be
'test'
THanks.
As you mentioned VARCHAR is variable-length. CHAR is fixed length.
when you say
Varchar(5) and if the data you store in it is of length 1, The
remaining 4 byte memory space will be used by others. example: "t"
on the other hand
Char(5) and if the data you store in it is of length 1, The remaining
4 byte memory space cant be used. The 4 byte will end up not used by
any other data. example: "t____" here ____ is the unused space.
I am measuring some values over a geo-location
I need to create a table that consists of:
date
longitude
latitude
value
The date column is the date of the measure,
The value is just an int value of the measure,
the longitude and latitude are a coordinates - they are floating points columns with 3 digits before the point and 5 after (i.e. *.*)
I'm wondering how to define my table, I try to use:
CREATE TABLE `obs` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`date` date DEFAULT NULL,
`lon` decimal(5,5) DEFAULT NULL,
`lat` decimal(5,5) DEFAULT NULL,
`val` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Here is a link to sqlFiddle
But When I'm trying to run
INSERT INTO `obs` VALUES (null,'2014/06/07','34.000','31.342',1)
I am getting the following error:
Out of range value for column 'lon' at row 1:
Can anyone explain me what's wrong?
decimal(5,5) means
5 decimal places in TOTAL
5 decimal places after the point
That would make all numbers invalid having a decimal place before the point.
You probably want
decimal(10,5)