This question already has answers here:
What is the size of column of int(11) in mysql in bytes?
(11 answers)
Closed 8 years ago.
I'm creating a table in MySql and I came across columns with datatype as mediumint followed by a number in parenthesis. What does this number denote?
https://dev.mysql.com/doc/refman/5.7/en/integer-types.html says that unsigned mediumint can take a max value of 16777215, so how does it differ if have columns with different sizes mediumint(6) or mediumint(10) ?
I suppose here in an answer:
http://dev.mysql.com/doc/refman/5.6/en/numeric-type-attributes.html
so difference is only in formatting output, nothing else...
Related
This question already has answers here:
CHECK constraint in MySQL is not working
(8 answers)
Closed 2 years ago.
i've created this table in SQL
CREATE TABLE product (
code CHAR(7) NOT NULL,
name VARCHAR(30) NOT NULL,
Description VARCHAR(500) NOT NULL,
cost DOUBLE UNSIGNED NOT NULL,
PRIMARY KEY (code),
check(substring(code,1,3) like '%[a-z]%'
and substring(code,4,4) like '%[0-9]%'),
);
the value 'code' must consist of 3 characters and 4 numbers, but it doesn't work. what's wrong in the check?
the value 'code' must consist of 3 characters and 4 numbers, but it doesn't work. what's wrong in the check?
Use regular expressions:
check (code regexp '^[A-Z]{3}[0-9]{4}$')
MySQL does not extend the definition of LIKE to include character classes. It has real regular expression support.
This question already has answers here:
MySQL: Error Code: 1118 Row size too large (> 8126). Changing some columns to TEXT or BLOB
(33 answers)
Row size too large error in mysql create table query
(8 answers)
Change limit for "Mysql Row size too large"
(19 answers)
Closed 3 years ago.
When I alter my table, I get an error:
1118 - Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead,
check the manual. You have to change some columns to TEXT or BLOBs
I've tried everything I could possibly think, please help.
ALTER TABLE property_rs_1
ADD `LA3_PhoneNumber3Ext` varchar(5) DEFAULT NULL COMMENT 'LA3Agent Phone3 Extension',
ADD `LA3_PhoneNumber4Desc` varchar(5) DEFAULT NULL COMMENT 'LA3AgentPhone4Description',
ADD `LA3_PhoneNumber4CountryCodeId` varchar(50) DEFAULT NULL COMMENT 'LA3Agent Phone4 CountryId',
ADD `LA3_PhoneNumber4` varchar(30) DEFAULT NULL COMMENT 'LA3Agent Phone4 Number',
ADD `LA3_PhoneNumber4Ext` varchar(5) DEFAULT NULL COMMENT 'LA3Agent Phone4 Extension'
This question already has answers here:
int(11) vs. int(anything else)
(7 answers)
Closed 6 years ago.
What is the maximum value that Int(8) can hold? Is there a difference between Int(8) and Int(11)?
Signed ranges between -2147483648 and 2147483647
Unsigned ranges between 0 and 4294967295
In MySQL, int numbers between brackets define the display width. They will, however, not cut off the number if the int is larger than the display width. You will mostly see the effect of int numbers when using zerofill.
More info: https://alexander.kirk.at/2007/08/24/what-does-size-in-intsize-of-mysql-mean/
This question already has answers here:
How can I modify the size of column in a MySQL table?
(3 answers)
How do I change the data type for a column in MySQL?
(9 answers)
Closed 8 years ago.
How to change the type of a column in SQL. For example the current type is char(2) I would like to make it char(20)?
ALTER TABLE test
ALTER COLUMN name char(20)
for MySql try:
ALTER TABLE test
MODIFY COLUMN name char(20)
This question already has answers here:
Types in MySQL: BigInt(20) vs Int(20)
(6 answers)
Closed 9 years ago.
I studied the MySQL documentation and am now unsure what the column length specification (M) in TINYINT(M) means. A TINYINT UNSIGNED has a value range of 0 to 255, but TINYINT(1) UNSIGNED has a range of 0 to 9 ?
Is it better for compression?
From MySQL documentation about numeric type attributes:
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. For example, a column
specified as SMALLINT(3) has the usual SMALLINT range of -32768 to
32767, and values outside the range permitted by three digits are
displayed in full using more than three digits.
When used in conjunction with the optional (nonstandard) attribute
ZEROFILL, the default padding of spaces is replaced with zeros. For
example, for a column declared as INT(4) ZEROFILL, a value of 5 is
retrieved as 0005.
That said, you should consider this attribute only if you care about the 0s you could show on the left or if you are in a CLI environment.
Furthermore, if you declare a field as tinyint(2) and the number stored in is 113, all 3 characters will shown (despite what previous answer said)