I need my integer column to be able to go up to 2000, so I made it INT(2000), but it keeps saying;
Display width out of range for column (max = 255)
I have tried using MEDIUMINT(2000) and BIGINT(2000), but both give the same message.
The number used in a SQL type is the width of the type, not the maximum value. When used on a numeric type, it represents the maximum number of base-10 digits used to represent a value in that column: for instance, an INT(5) can represent any value up to 99999.
A number with a maximum value of 2000 can be stored in any numeric column with a width of 4 or greater. But don't worry about the width; just use a normal INT and let the database use whatever size is default for that type. (It will be more than 4, but that's OK.)
BIGINT(255) Means a Big Integer with 255 digits.
And well , It's a very big number especially when the UNSIGNED flag is used.
BIGINT is mostly used for Id of something.
So i don't think that you need a number more than a 255-digit number.
Or if you do need , keep it in a string.
Related
When I tried to fill in a big number, error. How to add the maximum limit of INT?
UPDATE `test`.`number` SET `idNumber` = '36552124313028521236524313028' WHERE (`idNumber` = '365521');
You could try use a BigInt
If you want a number larger than the largest 64-bit unsigned integer 18,446,744,073,709,551,615 then you will need to store it as a varchar or some other Text form
refer to the MySQL data types for further info
It depends on how the column is to be used. For calculations or auto_increment attribute, numerics should be used. As you say you would like to add a maximum limit, by ADD I suppose you would like to define a length value to your liking. However, the whole number types such as small int, int, big int have a predefined maximum range , which can not be changed.（MySQL 8.0 users may try the check option, which is ignored in previous versions） If you need to define the limit for the whole number, there is a workaround by using decimal(n,0) to make the number always appear as a whole number.
For identifiers which do not require numerical calculations, varchar is generally acknowledged for strings that have a dynamic range, and char is more suitable for those having a static length,such as province acronym e.g AZ (Arizona) AR (Arkansas) CA (California). At the first glance of your idNumber column, I reckon it's better used for it's string's nature rather than numerics.
Last but not least. Please refrain from using a varchar for string-looking values that are prone to calculations,such as IP ADDRESS. It appears as a string in its dotted format, but deep inside it has an inherent nature of numerics. For instance, IPV4 has a range from 0.0.0.0 to 255.255.255.255 , which can be treated as a formula of (256 * 256 * 256 * 256) . Thus it is a perfect fit for the unsigned integer type in terms of length and can be calculated when necessary. To display it in its dotted format , use the inet_ntoa() function. e.g select inet_ntoa(3232235777);
I have a decimal field in my MySQL database. I have defined it as this:
decimal(1,1) UNSIGNED NULL. But I would like to set a default value for it like 7.0, and this is the problem I have. Whenever I want to set this value, I get this error:
Invalid default value ...
I also tried to set it as 7,0 and 7 but it resulted the same error. What is the correct default value for a MySQL decimal field?
Note: I am using Navicat for MySQL
In MySQL, when declaring DECIMAL(P,S) :
The precision (P) represents the number of significant digits that are stored for values, and the scale (S) represents the number of digits that can be stored following the decimal point.
So in your example, DECIMAL(1,1) means at most 1 digit, and at most 1 digit after the dot... which doesn't really make sense.
To better understand, here are more examples:
DECIMAL(5,2): 5 digits, two of them being used for the fractional part. Hence, possible values range from -999.99 to 999.99
DECIMAL(5,0): no fractional part allowed, so it is equivalent to an integer with maximum 5 digits.
With UNSIGNED, the behavior is the same, but using a minus sign will throw an error.
Was wondering if someone could help me on a data type questions for mysql. I would like to be able to load in numbers with maximum character length of 19 but with a maximum precision of 17 (so can have 17 digits after the decimal). I have tried using float(19,17) and decimal(19,17) but when i try loading a number such as 02.11111111112222222 it will not capture the full number. Thanks in advance
You can use decimal
decimal(19,17)
https://dev.mysql.com/doc/refman/5.7/en/precision-math-decimal-characteristics.html
Mysql Will store this value as 2.11111111112222222 i.e. without the leading 0.
check mysql documentation for decimal type, it says:
DECIMAL columns do not store a leading + character or - character or leading 0 digits. If you insert +0003.1 into a DECIMAL(5,1) column, it is stored as 3.1. For negative numbers, a literal - character is not stored.
The leading 0 case applies to your value and mysql is not storing that. Hence, you are getting 2.11111111112222222 stored in the table.
check https://dev.mysql.com/doc/refman/5.7/en/precision-math-decimal-characteristics.html
If you want to store leading zero as well change the definition by including UNSIGNED ZEROFILL after the datatype:
CREATE TABLE your_table
(
your_column DECIMAL(19,17) UNSIGNED ZEROFILL
);
Just to make a note:
if you are entering 2.11111111112222222 you will get a zero padded to make the digit count 19-17 for before decimal point and get 02.11111111112222222
if you are entering 02.111111111122222 you will get zero padded in right to make the digit count after decimal point as 17.
as all you know, when you describe varchar or integer fields you should set the length of them...
something like int(5) or varchar(5)...
but when you try add 123456 to both fields.. while varchar field truncates the value, integer field does not truncate it...
so what's the aim of describing int length?
int(5) does not do what you think it does: it specifies an integer field with a display width of 5 digits, i.e. numbers shorter than 5 digits will be padded with space characters.
In MySQL, int values are always 4 bytes wide and can go from -2,147,483,648 to 2,147,483,647.
See http://dev.mysql.com/doc/refman/5.0/en/numeric-types.html.
The N in INT(N), indicating application display length; is was very misleading, due to the syntax similarity to VARCHAR(N), and understandably, often misunderstood. It's effectively meaningless for all applications I've seen.
This goes for all TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT.
It appears this "length" is used for display only: http://dev.mysql.com/doc/refman/5.0/en/numeric-types.html
For example, INT(4) specifies an INT with a display width of four digits. This optional display width may be used by applications to display integer values having a width less than the width specified for the column by left-padding them with spaces. (That is, this width is present in the metadata returned with result sets. Whether it is used or not is up to the application.)
The size of the INT type is neither bits nor bytes. It's just the display width that is used when the field has ZEROFILL specified.
See this blog article for an in depth explanation.
FRom 10.2. Numeric Types
MySQL supports an extension for
optionally specifying the display
width of integer data types in
parentheses following the base keyword
for the type. For example, INT(4)
specifies an INT with a display width
of four digits. This optional display
width may be used by applications to
display integer values having a width
less than the width specified for the
column by left-padding them with
spaces. (That is, this width is
present in the metadata returned with
result sets. Whether it is used or not
is up to the application.)
The display width does not constrain
the range of values that can be stored
in the column. Nor does it prevent
values wider than the column display
width from being displayed correctly.
What is the maximum value allowed for a column of type tinyint(2)?
Are values like 255 or 99 allowed? I am confused because (2) after tinyint(2) denotes only the display... Am I correct?
It takes 127.
refer link : http://dev.mysql.com/doc/refman/5.1/en/numeric-types.html
MySQL 5.0 Reference Manual: Numeric Types
The display width does not constrain the range of values that can be stored in the column. Nor does it prevent values wider than the column display width from being displayed correctly.
Edit: No. Note that UNSIGNED is a non-standard attribute that affects the range. Neither value given in your question is the correct upper-limit of a normal TINYINT(2).
Edit for the comment edit: Trust the documentation unless there is a reason not to. If something seems fishy, TIAS (try it and see).
For tinyint data type:
if db column is SIGNED : min:-128 , max:127
if db column is UNSIGNED : min:0 , max:255
Just this.
more help! :
http://dev.mysql.com/doc/refman/5.1/en/integer-types.html
I believe the correct answer to this question is:
255
not 127.
Check this page out: Mysql Integer types
What other answers are failing to tell you is that the maximum can be 255 if you don't use negative numbers.
If you're using negative numbers then the maximum value can only be 127.
That's really what the unsigned and signed words mean, unfortunately no one explained this to you so I can see why it's confusing.
usigned means it cannot contain negative numbers so if you set your column to be unsigned then you can use 255 as the maximum. If you don't explicitly set the column as unsigned it means it will accept negative numbers (thus being a signed column) in which case the maximum will now be 127.
The other answers are technically correct because by default Mysql will set all integer columns as signed (able to use negative numbers). I just think this answer explains things a little more and is, perhaps, more germane to your original question.