I am writing a migration file in typeorm I wanted to add an extra column to my existing table.
I am writing the following query
await queryRunner.query('ALTER TABLE "me" ADD COLUMN "id" VARCHAR(255) DEFAULT NULL');
with the above query, I gt the following error:
RSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '"me" ADD COLUMN "id" VARCHAR(255) DEFAULT NULL' at line 1,`
I just want that my column is nullable, also I want to set Collation to utf8mb4_bin.
How do I achieve that?
There is no need to double quote around table and column name.
ALTER TABLE me ADD COLUMN id VARCHAR(255) DEFAULT NULL;
Furthermore, the id column usually is auto increment int and primary key field.So if you want to name a string field id, it maybe ambiguous.
Related
I want to change the column "ID" which is currently type INTEGER but have NULL values into type INTEGER NOT NULL AUTO_INCREMENT. But I am getting error. My SQL syntax is as follows.
ALTER TABLE users
ALTER COLUMN ID INTEGER NOT NULL AUTO_INCREMENT;
The above code is giving me syntax error.
Then I tried,
ALTER TABLE users
ALTER COLUMN ID INTEGER NOT NULL;
This is also giving me syntax error like
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTEGER NOT NULL' at line 2
Use MODIFY COLUMN:
ALTER TABLE users
MODIFY COLUMN ID INTEGER NOT NULL AUTO_INCREMENT;
There's also an ALTER COLUMN type of command, but it's only for specifying the DEFAULT for a column. Refer to https://dev.mysql.com/doc/refman/8.0/en/alter-table.html for examples.
I need to edit a datatype (IS_NULLABLE) from my column tag.
Nothing works, i have tried like that:
ALTER TABLE veille
ALTER COLUMN tag
SET IS_NULLABLE false
or like that :
ALTER TABLE veille ALTER COLUMN tag Modify datatype false
but doesn't work too, i have this error :
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IS_NULLABLE false' at line 3.
Edit : Resolved, the problem was my column has null values, i have changed these null values and all works fine.
use
ALTER TABLE veille ALTER COLUMN tag datatype
columns are nullable by default, As long as the column is not declared UNIQUE or NOT NULL, there shouldn't be any problems.
refer to this question: How do I modify a MySQL column to allow NULL?
No need for datatype false
Just use the query like below
alter table table_name modify column tag <datatype> not null;
try ALTER TABLE veille_ndd_hist MODIFY tag bit(1) NOT NULL DEFAULT b'0;
you may also try ALTER TABLE veille_ndd_hist CHANGE COLUMN tag tag BIT NOT NULL
Note that when using MODIFY, you need to specify the full column definition, including DEFAULT value if was defined.
side note: of course make sure that the column does not have any null values
Message : You have an error in your SQL syntax; check the manual
that corresponds to your MariaDB server version for the right syntax
to use near ''country_of_residence_id' INTEGER NOT NULL' Statement :
ALTER TABLE address ALTER COLUMN 'country_of_residence_id' INTEGER NOT
NULL
In my table 'address' I want to set an already existing column 'country_of_residence_id' to NOT NULL.
I tried it this way:
ALTER TABLE address
ALTER COLUMN 'country_of_residence_id' INTEGER NOT NULL;
My IDE underlines INTEGER and says: DROP or SET expected, got "INTEGER"
When I add SET before INTEGER it doesn't work either.
I found it here:
https://mariadb.com/kb/en/mariadb/alter-table/
alter table address modify country_of_residence_id bigint unsigned NOT NULL;
First of all, make all existing NULL values of rows disappear:
UPDATE [Table_Name] SET [Column_Name]=0 WHERE [Column_Name] IS NULL;
Then, update(alter) the table definition to reject NULLs:
ALTER TABLE [Table_Name] MODIFY [Column_Name] BIGINT UNSIGNED NOT NULL;
When running
ALTER TABLE my_table modify column my_column int(10) NOT NULL DEFAULT 0;
I've got the error message:
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'int(10) NOT NULL DEFAULT 0' at line 1.
How can this issue being fixed?
ALTER TABLE ... MODIFY COLUMN ... does not allow renaming the column; this is why the name of the column must be provided only once (the current name).
In order to rename the column (besides other changes you may want to operate on it, like changing its type) you have to use ALTER TABLE ... CHANGE COLUMN ... and provide the current and the new name of the column.
See the documentation page of the ALTER TABLE statement for more explanation and examples.
Try this code
ALTER TABLE my_table CHANGE mycolumn my_column INT( 10 ) NOT NULL DEFAULT '1';
I am very new to SQL and having problems with creating a table structure.
I want to create a table with four columns - id,text,date and replace. Problem is this is giving me an error in MySQL, I think because the words TEXT and DATE are also names for data types and REPLACE is another term used in SQL so MySQL is getting confused about what my column names should be or doesn't realise the names I've given are actual names. Is there any way I can get around this to get the column names I want, without having to call the columns something else and then change them back manually once created?
Here's my SQL:
CREATE TABLE message (
id INT UNIQUE AUTO_INCREMENT NOT NULL,
text TEXT,
date INT,
replace INT DEFAULT 0
);
And the error I'm getting:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'replace INT DEFAULT 0 )' at line 5
CREATE TABLE message(
id INT UNIQUE AUTO_INCREMENT NOT NULL ,
TEXT TEXT,
DATE INT,
REPLACE INT DEFAULT 0
);
CREATE TABLE message (
`id` INT UNIQUE AUTO_INCREMENT NOT NULL,
`text` TEXT,
`date` INT,
`replace` INT DEFAULT 0
);
General rule is don't use these keywords, come up with something different than 'text' for your field name. If you must, use ` (back-tick) around the column name to tell SQL it's a column name and not what the keyword means. I recommend against calling your columns 'from' 'select' and 'where' as well ;)