I am aware that the certain field doesn't have a default value.
I've been using MySQL 5.5.28 and it does work whenever I insert without specifying a value on that field. The field is TINYINT and by default, without specifying any value AND without declaring a default value during creation of the table, a value of 0 will be inserted in that field during INSERT statement.
However, after updating to MySQL 5.5.30, the query doesn't work anymore and is returning Field doesn't have a default value.
I've been looking through the changelogs and didn't find any clue that something has changed with regards to the default values of Integer.
MySQL 5.5.29 : http://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-29.html#mysqld-5-5-29-feature
MySQL 5.5.30 : http://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-30.html
Test queries:
MyTable has the Fields MyField1 and MyField2
INSERT INTO MyTable(MyField2)VALUES('MICHAEL');
Result on MySQL 5.5.28:
MyField1 | MyField2
0 | MICHAEL
With warning: 1 row(s) affected, 1 warning(s): 1364 Field 'MyField1' doesn't have a default value
Result on MySQL 5.5.30:
No changes on data and throws an error
Error Code: 1364. Field 'MyField1' doesn't have a default value
INSERT INTO MyTable(MyField1, MyField2)VALUES(0, 'MICHAEL');
The above query will work though.
In the 1st server strict sql mode was not enabled, while in the 2nd one it was. Read more about strict mode in the mysql documentation.
Specifically:
If strict mode is not in effect, MySQL inserts adjusted values for invalid or missing values and produces warnings (see Section 13.7.5.40, “SHOW WARNINGS Syntax”). In strict mode, you can produce this behavior by using INSERT IGNORE or UPDATE IGNORE.
Related
I am looking for a query resolution for one of insert scenarios in MySQL.
Below is the scenario:
create table test (test_date date);
insert into test values (str_to_date('16/04/1991','%d/%m/%y'))
MySQL is not allowing me to insert this record and displays an error "Truncated incorrect value"
I tried using IGNORE:
insert ignore into test values (str_to_date('16/04/1991','%d/%m/%y'))
but it captured year as 2019.
Please help.
thanks!
insert into test values (str_to_date('16/04/1991','%d/%m/%Y'))
It should be %Y for year
Please refer this page
This is actually a warning, not an error, it happens because MySQL is running in Strict Mode. In Strict Mode, warnings become errors when trying to INSERT/UPDATE. To disable strict mode, you can put SET sql_mode = ''; in the beginning of your query.
I am learning about MariaDBs column types and noticed this on my MariaDB db (latest dockerized 10.3.13), connected via HeidiSQL 10.
I can't set the default value for my FLOAT column to a value that contains decimal places:
After hitting save the default value is just 42. This also happens when performing the ALTER / CREATE TABLE query manually. (In the screenshot the column type is FLOAT but I also tested with FLOAT(10,2).)
Edit: When creating the table with this SQL statement, new rows will have the default value 42 instead of 42.11:
CREATE TABLE test2 (
`float` FLOAT(10,2) NOT NULL DEFAULT '42.11'
)
Why?
I've just reported that to HeidiSQL, This is only a display bug on HeidiSQL: https://github.com/HeidiSQL/HeidiSQL/issues/593
You can execute "SHOW CREATE TABLE test2" or insert data into test2, this will show you that default value is not truncated.
I have a table with a column that is filled by a before insert trigger, this column is set to be NOT NULL and has no DEFAULT VALUE.
When I do a INSERT TABLE without passing this column, I receive the error: 1364 - Field 'column_name' doesn't have a default value. I'd search the web for a solution and have encountered this question: Field 'id' doesn't have a default value?. I then checked and changed the mysql_mode from:
"STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION"
to:
"NO_ENGINE_SUBSTITUTION"
but the insert query still returns the same error.
What should I do to bypass this "strict" mode? Or is it something else?
Please let me know if I need to include any config variable. I'm using mysql 5.6.39.
This is a known bug for the mysql 5.6.39 version. And has been fixed since version 5.7.
I want to insert only one letter into the table field. What will be the data type that will accept only one character?
I don't want to use VARCHAR(1), because it will truncate the remaining characters. I want that if the input is 1 character, it will insert otherwise it will not insert into the table
If you set the column length to be longer (for example, 255), then you can add a trigger which checks the length of the new field. If greater than 1 then you can trigger an error.
For a test example:-
CREATE TABLE IF NOT EXISTS `insert_test` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`sometext` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;
--
-- Triggers `insert_test`
--
DROP TRIGGER IF EXISTS `length_check_trigger`;
DELIMITER //
CREATE TRIGGER `length_check_trigger` BEFORE INSERT ON `insert_test`
FOR EACH ROW BEGIN
DECLARE msg VARCHAR(255);
IF LENGTH(NEW.sometext) > 1 THEN
SET msg = "DIE: String Too Long.";
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = msg;
END IF;
END
//
DELIMITER ;
You can change the message to what you want. You will need a similar trigger to catch updates as well.
In mysql the data type itself does not control if the attempt to insert / update a field to a longer (invalid) data, than it is allowed by the field definition results in an error or warning.
In mysql you need to set the sql mode to one of the strict sql modes as described by mysql's documentation on sql mode.
If strict mode is not in effect, MySQL inserts adjusted values for
invalid or missing values and produces warnings (see Section
13.7.5.40, “SHOW WARNINGS Syntax”). In strict mode, you can produce this behavior by using INSERT IGNORE or UPDATE IGNORE.
So, both varchar(1) and char(1) are correct definitions, however, you need to enable strict sql mode in order for inserting / updating invalid data to produce an error. Setting sql mode in config file or using set statement is described in the linked documentation:
To set the SQL mode at server startup, use the --sql-mode="modes"
option on the command line, or sql-mode="modes" in an option file such
as my.cnf (Unix operating systems) or my.ini (Windows). modes is a
list of different modes separated by commas. To clear the SQL mode
explicitly, set it to an empty string using --sql-mode="" on the
command line, or sql-mode="" in an option file. ... To change the
SQL mode at runtime, set the global or session sql_mode system
variable using a SET statement:
SET GLOBAL sql_mode = 'modes';
SET SESSION sql_mode = 'modes';
Have you tried the datatype:
TINYTEXT
?
or would it not work on the system you are using?
I have a system that insert some datetime field as an empty string '' and it works. However, i tried to install in a different machine and it fails.
It returns
Error Code: 1292. Incorrect datetime value: '' for column 'MyDate' at row 1 0.000 sec
btw, i can't change the system and both system (the working one and the new one) runs on windows.
Disable STRICT_MODE (which is enabled by default on Windows installations)