Alter a MySQL column to be AUTO_INCREMENT
ALTER TABLE document MODIFY COLUMN document_id INT auto_increment
alter-table
SQL Server add auto increment primary key to existing table
No – you have to do it the other way around: add it right from the get go as INT IDENTITY – it will be filled with identity values when you do this: ALTER TABLE dbo.YourTable ADD ID INT IDENTITY and then you can make it the primary key: ALTER TABLE dbo.YourTable ADD CONSTRAINT PK_YourTable … Read more
How can I add a column that doesn’t allow nulls in a Postgresql database?
You have to set a default value. ALTER TABLE mytable ADD COLUMN mycolumn character varying(50) NOT NULL DEFAULT ‘foo’; … some work (set real values as you want)… ALTER TABLE mytable ALTER COLUMN mycolumn DROP DEFAULT;
How can I modify the size of column in a MySQL table?
Have you tried this? ALTER TABLE <table_name> MODIFY <col_name> VARCHAR(65353); This will change the col_name‘s type to VARCHAR(65353)
How do I rename a column in a SQLite database table?
Note that as of version 3.25.0 released September 2018 you can now use ALTER TABLE to rename a column. Original “create new and drop old table” answer below. Say you have a table and need to rename “colb” to “col_b”: First create the new table with a temporary name, based on the old table definition … Read more
Altering column size in SQL Server
ALTER TABLE [Employee] ALTER COLUMN [Salary] NUMERIC(22,5) NOT NULL
How do you change the datatype of a column in SQL Server?
ALTER TABLE TableName ALTER COLUMN ColumnName NVARCHAR(200) [NULL | NOT NULL] EDIT As noted NULL/NOT NULL should have been specified, see Rob’s answer as well.
How to rename a table in SQL Server?
To rename a table in SQL Server, use the sp_rename command: exec sp_rename ‘schema.old_table_name’, ‘new_table_name’
Error renaming a column in MySQL
Lone Ranger is very close… in fact, you also need to specify the datatype of the renamed column. For example: ALTER TABLE `xyz` CHANGE `manufacurerid` `manufacturerid` INT; Remember : Replace INT with whatever your column data type is (REQUIRED) Tilde/ Backtick (`) is optional
Adding multiple columns AFTER a specific column in MySQL
Try this ALTER TABLE users ADD COLUMN `count` SMALLINT(6) NOT NULL AFTER `lastname`, ADD COLUMN `log` VARCHAR(12) NOT NULL AFTER `count`, ADD COLUMN `status` INT(10) UNSIGNED NOT NULL AFTER `log`; check the syntax