To remove a constraint, use theDROP CONSTRAINTclause in theALTER TABLEstatement. If you wish to drop the unique constraint on the “Email” column: <br> ALTER TABLE Customers<br> DROP CONSTRAINT UQ_Email;<br> 4.
SP_RENAME 'TableName.ColumnName', 'NewColumnName', 'Column' replace TableName, ColumnName and NewColumName with proper values http://msdn.microsoft.com/en-us/library/ms188351.aspx to change column data type, or making it not null etc, u can use alter table syntx like this ...
How to Use RENAME COLUMN Command to Rename Columns in PostgreSQL? The“RENAME COLUMN”command can also be used as“RENAME”. TheRENAME COLUMNcommand gets executed with the assistance ofALTER TABLEcommand, as shown in the following syntax: ALTER TABLE tab_name RENAME COLUMN old_col_name TO new...
ALTER command can be used to add columns to an existing table, drop a column from a table, rename an existing column, and change the data type of a column. Below are the syntax used for the different operations which can be performed using Alter command. The syntax for adding a new col...
PostgreSQL throws an error if you try to rename the non-existing table. In order to avoid this situation, you need to add the IF EXISTS parameter as follows: Code: ALTER TABLE IF EXISTS table_name RENAME TO new_table_name; In order to rename multiple tables at a time, you need to ex...
SQL Copy Here we get the constraints name that we have created. Now we are able to drop the constraints by using the above name. alter table STUDENT_DETAILS drop constraint DF__STUDENT_D__IS_RE__3846C6FF SQL Copy Now we are able to drop the column by using the below query. alter ...
A Brief on the SELECT Query in SQL The Select query in SQL is one of the most important commands in SQL, and it is used to get data from a table. Syntax SELECT column1, column2, columnN FROM tablename; where SELECT and FROM are the keywords; column1 to columnN are a set of co...
"EXECUTE AT" with Dynamic Linked Server Name "explicit value must be specified for identity column in table" error in SQL 2000 "FROM clause have the same exposed names. Use correlation names to distinguish them" "No transaction is active." error when trying to send a transactional SQL statmen...
2. Click on “Rename this PC“ Click on the rename this PC button. Or to open up interface similar to Windows 7, click on the Rename this PC (advanced) link on the right pane. By selecting the first option you can simply enter the new name in the dialogue and click on the next....
SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[Customer]( [ID] [int] NOT NULL, [SomeText] [nvarchar](50) COLLATE Latin1_General_CI_AS NOT NULL ) ON [PRIMARY] To alter the column ID to become the primary key/identity column use this sql script ...