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Is there a way to modify multiple columns in one sql query? For example I want to change the column definition of multiple columns in single table as follows. I am using SQL server 2012.
ALTER TABLE [Department]
ALTER COLUMN [DepartmentName] VARCHAR(200) NULL ,
[ProjectManagerName] VARCHAR(200) NULL ,
[AccountManagerName] VARCHAR(200) NULL
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First, you specify the table name after the ALTER TABLE clause. Second, you put the new column and its definition after the ADD COLUMN clause. Note that COLUMN keyword is optional so you can omit it. Third, MySQL allows you to add the new column as the first column of the table by specifying the FIRST keyword.
It is not possible to do multiple ALTER column for a table.
We can update multiple columns by specifying multiple columns after the SET command in the UPDATE statement. The UPDATE statement is always followed by the SET command, it specifies the column where the update is required.
Let’s see how to add multiple columns in MySQL table using the Alter Table statement. This ALTER TABLE example will modify two columns to the contacts table – last_name and first_name. The last_name field will be changed to a varchar (55) NULL column and will appear after the contact_type column in the table.
How to Alter Multiple Columns at Once in SQL Server? In SQL, sometimes we need to write a single query to update the values of all columns in a table. We will use the UPDATE keyword to achieve this.
Summary: in this tutorial, you will learn how to use the SQL Server ALTER TABLE ALTER COLUMN statement to modify a column of a table. SQL Server allows you to perform the following changes to an existing column of a table: To modify the data type of a column, you use the following statement:
If you want to modify all or several of the columns in your table to the same datatype (such as expanding a VARCHAR field from 50 to 100 chars), you can generate all the statements automatically using the query below. This technique is also useful if you want to replace the same character in multiple fields (such as removing from all columns).
Alter multiple columns in one time - impossible.
You could create Temp table with your edited columns, copy data from source table to temp table, drop your source table and rename temp table.
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It is not possible to do multiple ALTER column for a table.
You have to alter them one by one like
ALTER TABLE Department ALTER COLUMN [DepartmentName] VARCHAR(200) NULL;
ALTER TABLE Department ALTER COLUMN [ProjectManagerName] VARCHAR(200) NULL;
ALTER TABLE Department ALTER COLUMN [ProjectManagerName] VARCHAR(200) NULL;
ALTER TABLE Department ALTER COLUMN [AccountManagerName] VARCHAR(200) NULL;
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